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Papers by bingsuo zou

Synthetic Metals, 2000

. Photoinduced vibrational bands of poly 3-octylthiophene , P3OT, have been studied at room tempe... more . Photoinduced vibrational bands of poly 3-octylthiophene , P3OT, have been studied at room temperature by using time-resolved FTIRŽ . spectroscopy TR-FTIRS in the nanosecond to microsecond time domain. A photo-bleach occurs in the deformation band of 5C S C5 y1 Ž y1 . at 1463-1419 cm , and a few transient absorption bands occur at lower frequency e.g. ; 1290 cm . The transient absorption band at 1290 cm y1 shows a signal exponential formation occurring in -200 ns, and a double exponential decay process, with lifetimes of 53 and 788 ms. Adding Fe O nanoparticle into the polymer composite significantly enhances the photoinduced signal, indicating the 2 3

Physical Review B, 1999

In order to identify the luminescent centers in aged porous silicon, both the time-resolved vibra... more In order to identify the luminescent centers in aged porous silicon, both the time-resolved vibration spectra in the 750–2000-cm -1 region and the visible luminescence spectra are studied for the same sample in the 0–440-μs time domain. Laser excitation gives rise to emission ...

Physical Review B, 2000

Origin of emission from porous silicon: Temperature-dependence correlation with proton conductivi... more Origin of emission from porous silicon: Temperature-dependence correlation with proton conductivity. Bingsuo Zou * , Jianping Wang, Chao Liu, John Z. Zhang, and Mostafa A. El-Sayed † Laser Dynamics Laboratory, School ...

Nanoscience and Nanotechnology Letters, 2014

Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts with significant room temperature ferromagnetis... more Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts with significant room temperature ferromagnetism were synthesized via chemical vapor deposition method. X-ray diffraction and energy dispersive X-ray spectroscopy were used to confirm the successful doping of Mn 2+ into ZnS nanobelts. Room temperature photoluminescence spectra of Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts reveal that Mn concentration plays an important role in tuning emission color from orange to red. At low dopant concentration (2%), single nanobelt shows defect related emission of ZnS host and d-d ( 4 T 1 → 6 A 1 ) transition emission of Mn 2+ . However, only Mn 2+ related emission is observed when dopant concentration reaches 5%. At higher doping, sideband (red emission band at 666 nm) to the red side of single Mn emission is detected, which may originate from the Mn-dimers. The red emission band has been observed for the first time in Mn-doped ZnS nanobelts. The enhancement of saturation magnetic moment was observed with increasing Mn doping concentration. These doped nanobelts with novel red emission band can find applications in the fabrication of magnetooptical nanodevices.

Langmuir, 2013

The ability to tune the size, shape, and properties of supraparticles is of great importance for ... more The ability to tune the size, shape, and properties of supraparticles is of great importance for fundamental study as well as their promising applications. We previously developed a method to synthesize monodisperse ZnSe supraparticles via "in situ aggregation" of ZnSe nanoparticles through a simple hot-injection method. In the present work, we show that the "in situ aggregation" strategy can be extended to tune the shapes of ZnSe supraparticles, and introduce novel functional magnetic and luminescence properties. Shape control is manipulated with oleic acid as ligands, which balances the attractive interparticles van der Waals forces and steric repulsive forces from the ligands. With the increase of oleic acid concentration, a morphology change from microspheres to asymmetrical multimer and three-dimensional nanoflowers was observed. "Doping" preformed Fe(3)O(4) nanoparticles into ZnSe supraparticles endow them with magnetic properties. The magnetism of these Fe(3)O(4)@ZnSe supraparticles depends on the dosage of dopant. Doping of preformed CdS nanocrystals was also studied, resulting in emissive hybrid CdS@ZnSe supraparticles with diameters of 50-100 nm. It is noted that the doping of Fe(3)O(4) and CdS nanoparticles show differing morphologies. The differences can be explained by variance in the lattice mismatches which leads to differing potentials for crystal growth.

ACS Applied Materials & Interfaces, 2014

ZnO:Mn nanostructures are important diluted magnetic materials, but their electronic structure an... more ZnO:Mn nanostructures are important diluted magnetic materials, but their electronic structure and magnetic origin are still not well understood. Here we studied the time-delayed and power-dependent photoluminescence spectra of Mn(II) doped ZnO nanowires with very low Mn concentration. From the time-delayed emission spectra, we obtained their electronic levels of single Mn ion replacement of Zn ions in ZnO nanowire. The high d-level emissions show up unusually because of the stronger p−d hybridization than that in ZnS, as well as the spin−spin coupling. After increasing Mn doping concentration, the ferromagentic cluster of the Mn−O− Mn with varied configurations can form and give individual emission peaks, which are in good agreement with the ab initio calculations. The presence of clustered Mn ions originates from their ferromagnetic coupling. The lifetimes of these d levels show strong excitation power-dependent behavior, indication of strong spin-dependent coherent emission. One-dimensional structure is critical for this coherent emission behavior. These results indicate that the d state is not within Mn ion only, but a localized exciton magnetic polaron, Mn−O−Mn coupling should be one source of ferromagnetism in ZnO:Mn lattice, the latter also can combine with free exciton for EMP and produce coherent EMP condensation and emission from a nanowire. This kind of nanowires can be expected to work for both spintronic and spin-photonic devices if we tune the transition metal ion doping concentration in it.

Advanced Optical Materials, 2014

ABSTRACT Colloidal semiconductor nanowires are attractive materials with polarized light absorpti... more ABSTRACT Colloidal semiconductor nanowires are attractive materials with polarized light absorption and emissions. Solution synthesis of ultralong (several tens of micro­meters) colloidal CdSexS1-x nanowires with homogeneously alloyed composition through a solution–liquid–solid (SLS) method are reported. By varying the ratio of Se/S, the optical band and their corresponding photoluminescence spectra of the CdSexS1-x nanowires can be finely tuned from 508 nm (ca. 2.45 eV) to 628 nm (ca. 2.0 eV). In comparison with the low quantum yields of pure CdS and CdSe nanowires (less than 0.1%), alloyed CdSexS1-x nanowires exhibit enhanced bright photoluminescence emission with a narrow spectral width of 25–31 nm and moderate quantum yields up to ca. 8.8%. Moreover, the randomly oriented ensembles on glass wafers show strong polarized emission with polarization values of ca. 0.6 due to the inherent larger aspect ratio. The combination of these characteristics in alloyed nanowires sets the basis for the spectroscopic study of 1D excitons, as well as the fabrication of nanowire-based polarized photonic and optoelectronic devices.

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009

We demonstrate lasing from semiconductor nanowires with wavelength continuously tunable from 500 ... more We demonstrate lasing from semiconductor nanowires with wavelength continuously tunable from 500 to 700 nm on single substrate. This widest ever tuning range of any semiconductor lasers is achieved through spatial composition-grading of alloy semiconductors. a1014_1.pdf a1014_1.pdf CTuY7.pdf

Journal of Physical Chemistry B - J PHYS CHEM B, 2006

ZnO has become the focus of photonics and optoelectronic research. We prepared pure Mn(II) doped ... more ZnO has become the focus of photonics and optoelectronic research. We prepared pure Mn(II) doped ZnO nanowires with a controlled reduction reaction by carbon in an asymmetrical tube. Careful time-resolved photoluminescence experimental study indicates three types of lasing mechanisms: exciton-exciton interaction, bipolaronic exciton condensation, and plasma; these exist in different ZnO nanowires, which can be changed by doping Mn in ZnO nanowire. The transformation between varied mechanisms is discussed in detail with their spectral behaviors. These results are important in the design of future violet-blue luminescence and display devices.

Journal of Physics D-applied Physics, 2008

... doi:10.1088/0022-3727/41/13/135301 One-step synthesis of low-dimensional CdSe nanostructures ... more ... doi:10.1088/0022-3727/41/13/135301 One-step synthesis of low-dimensional CdSe nanostructures and optical waveguide of CdSe nanowires GuoZhang Dai, QingLin Zhang, ZhiWei Peng, WeiChang Zhou, MingXia Xia, Qiang Wan, AnLian Pan and BingSuo Zou1 ...

Plasmonics, 2014

ABSTRACT A model of a multi-band-stop filter is proposed for single-photon transport, using a one... more ABSTRACT A model of a multi-band-stop filter is proposed for single-photon transport, using a one-dimensional waveguide side coupled with a series of optical cavities. Its transmission behavior is theoretically studied by a real-space model Hamiltonian and is found to depend on cavity mode frequencies, cavity relative phases, as well as cavity number and the coupling strength between the waveguide and the optical cavities. With proper cavity-mode frequencies and relative phases, the proposed model shows multi-band-stop regions and a rectangular transmission spectrum. Based on these phenomena, optical filters with more than one band-stop regions are simulated with gold material in the THz and communication band.

Materials Letters, 2006

Cobalt-doped disulfide nanotubes were fabricated by a technique of exfoliation-intercalation-hydr... more Cobalt-doped disulfide nanotubes were fabricated by a technique of exfoliation-intercalation-hydrothermal adulteration. WS 2 and MoS 2 powder was used as primary materials and was exfoliated into single layer by n-butyllithium. Then Co 2+ cations entered into MoS 2 and WS 2 matrix through a hydrothermal process with CoCl 2 aqueous solution. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDX), respectively. XRD results indicate that multimetal disulfide can be prepared by this approach. TEM images show that the morphology of the products is bamboo-like nanotube with open-end, tip-end and joint. HRTEM images show that the tip-end, joint and wall of bamboo-like nanotubes are of inorganic fullerene-like (IF-like) nanostructures. EDX results show that the components of bamboo-like nanotubes are Co, Mo, W and S. A possible formation mechanism of bamboo-like nanotubes was suggested.

Optics Express, 2013

We here report the integration of red emissive CuInS 2 based nanocrysals as a potential red phosp... more We here report the integration of red emissive CuInS 2 based nanocrysals as a potential red phosphor for warm light generation. By combining red emissive CuInS 2 based nanocrysals with commercial yellow emissive YAG:Ce and green emissive Eu 2+ doped silicate phosphors, we fabricated warm white light-emitting diodes with high color rendering index up to ~92, high luminous efficiency of 45~60 lm/W and color temperature less than 4000K.

Materials Letters, 2014

The successful synthesis of ZnS hollow microspheres by a solvothermal route is reported. The synt... more The successful synthesis of ZnS hollow microspheres by a solvothermal route is reported. The synthesis was achieved by a proper selection of a sulfur source, i.e., Na 2 S 2 O 3 ·5H 2 O or ͑NH 2 ͒ 2 CS, to react with Zn͑CH 3 COO͒ 2 ·2H 2 O in mixed solvents of ethylene glycol and deionized water. The ZnS products were characterized by X-ray diffraction ͑XRD͒, scanning electron microscopy ͑SEM͒, transmission electron microscopy ͑TEM͒, and photoluminescence spectroscopy. XRD identified the ZnS products to have either zinc blende or wurtzite structure. SEM images revealed hollow ZnS microspheres with 1 to 2 m diameters and 100 to 200 nm shell thicknesses. TEM images confirmed that the hollow ZnS microspheres were assembled by ZnS crystalline nanocrystallites. The room-temperature photoluminescence spectrum of the zinc blende hollow microspheres showed a strong green emission at 514 nm and weak emission at 379 nm. © 2009 International Centre for Diffraction Data.

Nanotechnology, 2014

Tunable optical emission properties from ferromagnetic semiconductors have not been well identifi... more Tunable optical emission properties from ferromagnetic semiconductors have not been well identified yet. In this work, high-quality Mn(II)-doped CdS nanowires and micrometer belts were prepared using a controlled chemical vapor deposition technique with time, precursor concentration, and temperature, in which Mn incorporation can be modulated. These wires or belts can produce both tunable redshifted emissions and ferromagnetic responses simultaneously upon doping. The strong emission bands at 572, 651, 693, 712, 745, 768, 787, and 803 nm, due to the Mn(II) 4 T 1 ( 4 G) → 6 A 1 ( 6 s) d-d transition, can be detected and accounted for by the aggregation of Mn ions at Cd sites in the CdS lattice at high temperature. These aggregates with ferromagnetism and shifted luminescence are related to the excitonic magnetic polaron (EMP) and localized EMP formations; this is verified by ab initio calculations. The correlation between aggregation-dependent optical emissions and ferromagnetic responses not only presents a new size effect for diluted magnetic semiconductors (DMSs), but also supplies a possible way to study or modulate the ferromagnetic properties of a DMS and to fabricate spin-related photonic devices in the Q1 future.

ChemInform, 2011

Cu-based ternary chalcogenides have received great interest as low-cost alternatives to conventio... more Cu-based ternary chalcogenides have received great interest as low-cost alternatives to conventional photovoltaic materials. In this work, a large quantity of single-crystalline, orthorhombic phase Cu 4 Bi 4 S 9 nanoribbons are fabricated using a facile solvothermal method. The growth of the Cu 4 Bi 4 S 9 nanoribbons is revealed to be a layer-by-layer stacking of Cu 4 Bi 4 S 9 thin slabs via dodecylamine (DDA) linker, in which the number of stacking layers, and, subsequently, the width-to-thickness ratio, depends on the DDA concentration. Optical investigations show that the as-prepared Cu 4 Bi 4 S 9 nanoribbons have a narrow bandgap of E g = 1.14 eV and enhanced surface photovoltage response in the entire visible wavelength range. It is indicated that these Cu 4 Bi 4 S 9 nanoribbons have potential application in photodetectors, solar cells, or other optoelectronic devices.

MRS Proceedings, 2009

ABSTRACT Superparamagnetic nanoparticles can find many applications in different fields with gree... more ABSTRACT Superparamagnetic nanoparticles can find many applications in different fields with greener techniques. The Fe3O4 nanoparticles less than 10nm coated with humic acid were synthesized by a chemical co-precipitation technique with cheap and environmental friendly iron salts and humic acid. The as-synthesized products were highly soluble in water. The efficacy for liver Magnetic resonance imaging (MRI) contrast agent was investigated by using it to the live rat and tumor-bearing rabbit models, on a conventional clinical 1.5 T MRI facility. Moreover the Fe3O4 –HA composite used in the Methylene Blue adsorption in neutral aqueous solution was studied too with high efficiency. The experimental results showed that the humic acid coated Fe3O4 superparamagnetic nanoparticles were suitalbe not only for liver MRI contrast agent, but also as adsorbents for removal of cationic organic dyes from neutral water.

Physical Review B, 1998

Transient grating of biphotonic holography is studied theoretically and experimentally in trans-c... more Transient grating of biphotonic holography is studied theoretically and experimentally in trans-cis isomerization azo materials. The theoretical description of the transient biphotonic holographic grating agrees well with experimental results in methyl yellow-polymethylmethacrylate and ethyl orange-polyvinylalcohol films. The mechanism of the biphotonic holographic grating in the azo materials can be attributed to the redistribution of cis isomers induced by both the

Photorefractive Materials, 1996

ABSTRACT

Principles and Applications, 2012

ABSTRACT

Synthetic Metals, 2000

. Photoinduced vibrational bands of poly 3-octylthiophene , P3OT, have been studied at room tempe... more . Photoinduced vibrational bands of poly 3-octylthiophene , P3OT, have been studied at room temperature by using time-resolved FTIRŽ . spectroscopy TR-FTIRS in the nanosecond to microsecond time domain. A photo-bleach occurs in the deformation band of 5C S C5 y1 Ž y1 . at 1463-1419 cm , and a few transient absorption bands occur at lower frequency e.g. ; 1290 cm . The transient absorption band at 1290 cm y1 shows a signal exponential formation occurring in -200 ns, and a double exponential decay process, with lifetimes of 53 and 788 ms. Adding Fe O nanoparticle into the polymer composite significantly enhances the photoinduced signal, indicating the 2 3

Physical Review B, 1999

In order to identify the luminescent centers in aged porous silicon, both the time-resolved vibra... more In order to identify the luminescent centers in aged porous silicon, both the time-resolved vibration spectra in the 750–2000-cm -1 region and the visible luminescence spectra are studied for the same sample in the 0–440-μs time domain. Laser excitation gives rise to emission ...

Physical Review B, 2000

Origin of emission from porous silicon: Temperature-dependence correlation with proton conductivi... more Origin of emission from porous silicon: Temperature-dependence correlation with proton conductivity. Bingsuo Zou * , Jianping Wang, Chao Liu, John Z. Zhang, and Mostafa A. El-Sayed † Laser Dynamics Laboratory, School ...

Nanoscience and Nanotechnology Letters, 2014

Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts with significant room temperature ferromagnetis... more Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts with significant room temperature ferromagnetism were synthesized via chemical vapor deposition method. X-ray diffraction and energy dispersive X-ray spectroscopy were used to confirm the successful doping of Mn 2+ into ZnS nanobelts. Room temperature photoluminescence spectra of Zn 1−X Mn X S (X = 0, 0.02, 0.05, 0.09) nanobelts reveal that Mn concentration plays an important role in tuning emission color from orange to red. At low dopant concentration (2%), single nanobelt shows defect related emission of ZnS host and d-d ( 4 T 1 → 6 A 1 ) transition emission of Mn 2+ . However, only Mn 2+ related emission is observed when dopant concentration reaches 5%. At higher doping, sideband (red emission band at 666 nm) to the red side of single Mn emission is detected, which may originate from the Mn-dimers. The red emission band has been observed for the first time in Mn-doped ZnS nanobelts. The enhancement of saturation magnetic moment was observed with increasing Mn doping concentration. These doped nanobelts with novel red emission band can find applications in the fabrication of magnetooptical nanodevices.

Langmuir, 2013

The ability to tune the size, shape, and properties of supraparticles is of great importance for ... more The ability to tune the size, shape, and properties of supraparticles is of great importance for fundamental study as well as their promising applications. We previously developed a method to synthesize monodisperse ZnSe supraparticles via "in situ aggregation" of ZnSe nanoparticles through a simple hot-injection method. In the present work, we show that the "in situ aggregation" strategy can be extended to tune the shapes of ZnSe supraparticles, and introduce novel functional magnetic and luminescence properties. Shape control is manipulated with oleic acid as ligands, which balances the attractive interparticles van der Waals forces and steric repulsive forces from the ligands. With the increase of oleic acid concentration, a morphology change from microspheres to asymmetrical multimer and three-dimensional nanoflowers was observed. "Doping" preformed Fe(3)O(4) nanoparticles into ZnSe supraparticles endow them with magnetic properties. The magnetism of these Fe(3)O(4)@ZnSe supraparticles depends on the dosage of dopant. Doping of preformed CdS nanocrystals was also studied, resulting in emissive hybrid CdS@ZnSe supraparticles with diameters of 50-100 nm. It is noted that the doping of Fe(3)O(4) and CdS nanoparticles show differing morphologies. The differences can be explained by variance in the lattice mismatches which leads to differing potentials for crystal growth.

ACS Applied Materials & Interfaces, 2014

ZnO:Mn nanostructures are important diluted magnetic materials, but their electronic structure an... more ZnO:Mn nanostructures are important diluted magnetic materials, but their electronic structure and magnetic origin are still not well understood. Here we studied the time-delayed and power-dependent photoluminescence spectra of Mn(II) doped ZnO nanowires with very low Mn concentration. From the time-delayed emission spectra, we obtained their electronic levels of single Mn ion replacement of Zn ions in ZnO nanowire. The high d-level emissions show up unusually because of the stronger p−d hybridization than that in ZnS, as well as the spin−spin coupling. After increasing Mn doping concentration, the ferromagentic cluster of the Mn−O− Mn with varied configurations can form and give individual emission peaks, which are in good agreement with the ab initio calculations. The presence of clustered Mn ions originates from their ferromagnetic coupling. The lifetimes of these d levels show strong excitation power-dependent behavior, indication of strong spin-dependent coherent emission. One-dimensional structure is critical for this coherent emission behavior. These results indicate that the d state is not within Mn ion only, but a localized exciton magnetic polaron, Mn−O−Mn coupling should be one source of ferromagnetism in ZnO:Mn lattice, the latter also can combine with free exciton for EMP and produce coherent EMP condensation and emission from a nanowire. This kind of nanowires can be expected to work for both spintronic and spin-photonic devices if we tune the transition metal ion doping concentration in it.

Advanced Optical Materials, 2014

ABSTRACT Colloidal semiconductor nanowires are attractive materials with polarized light absorpti... more ABSTRACT Colloidal semiconductor nanowires are attractive materials with polarized light absorption and emissions. Solution synthesis of ultralong (several tens of micro­meters) colloidal CdSexS1-x nanowires with homogeneously alloyed composition through a solution–liquid–solid (SLS) method are reported. By varying the ratio of Se/S, the optical band and their corresponding photoluminescence spectra of the CdSexS1-x nanowires can be finely tuned from 508 nm (ca. 2.45 eV) to 628 nm (ca. 2.0 eV). In comparison with the low quantum yields of pure CdS and CdSe nanowires (less than 0.1%), alloyed CdSexS1-x nanowires exhibit enhanced bright photoluminescence emission with a narrow spectral width of 25–31 nm and moderate quantum yields up to ca. 8.8%. Moreover, the randomly oriented ensembles on glass wafers show strong polarized emission with polarization values of ca. 0.6 due to the inherent larger aspect ratio. The combination of these characteristics in alloyed nanowires sets the basis for the spectroscopic study of 1D excitons, as well as the fabrication of nanowire-based polarized photonic and optoelectronic devices.

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009

We demonstrate lasing from semiconductor nanowires with wavelength continuously tunable from 500 ... more We demonstrate lasing from semiconductor nanowires with wavelength continuously tunable from 500 to 700 nm on single substrate. This widest ever tuning range of any semiconductor lasers is achieved through spatial composition-grading of alloy semiconductors. a1014_1.pdf a1014_1.pdf CTuY7.pdf

Journal of Physical Chemistry B - J PHYS CHEM B, 2006

ZnO has become the focus of photonics and optoelectronic research. We prepared pure Mn(II) doped ... more ZnO has become the focus of photonics and optoelectronic research. We prepared pure Mn(II) doped ZnO nanowires with a controlled reduction reaction by carbon in an asymmetrical tube. Careful time-resolved photoluminescence experimental study indicates three types of lasing mechanisms: exciton-exciton interaction, bipolaronic exciton condensation, and plasma; these exist in different ZnO nanowires, which can be changed by doping Mn in ZnO nanowire. The transformation between varied mechanisms is discussed in detail with their spectral behaviors. These results are important in the design of future violet-blue luminescence and display devices.

Journal of Physics D-applied Physics, 2008

... doi:10.1088/0022-3727/41/13/135301 One-step synthesis of low-dimensional CdSe nanostructures ... more ... doi:10.1088/0022-3727/41/13/135301 One-step synthesis of low-dimensional CdSe nanostructures and optical waveguide of CdSe nanowires GuoZhang Dai, QingLin Zhang, ZhiWei Peng, WeiChang Zhou, MingXia Xia, Qiang Wan, AnLian Pan and BingSuo Zou1 ...

Plasmonics, 2014

ABSTRACT A model of a multi-band-stop filter is proposed for single-photon transport, using a one... more ABSTRACT A model of a multi-band-stop filter is proposed for single-photon transport, using a one-dimensional waveguide side coupled with a series of optical cavities. Its transmission behavior is theoretically studied by a real-space model Hamiltonian and is found to depend on cavity mode frequencies, cavity relative phases, as well as cavity number and the coupling strength between the waveguide and the optical cavities. With proper cavity-mode frequencies and relative phases, the proposed model shows multi-band-stop regions and a rectangular transmission spectrum. Based on these phenomena, optical filters with more than one band-stop regions are simulated with gold material in the THz and communication band.

Materials Letters, 2006

Cobalt-doped disulfide nanotubes were fabricated by a technique of exfoliation-intercalation-hydr... more Cobalt-doped disulfide nanotubes were fabricated by a technique of exfoliation-intercalation-hydrothermal adulteration. WS 2 and MoS 2 powder was used as primary materials and was exfoliated into single layer by n-butyllithium. Then Co 2+ cations entered into MoS 2 and WS 2 matrix through a hydrothermal process with CoCl 2 aqueous solution. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDX), respectively. XRD results indicate that multimetal disulfide can be prepared by this approach. TEM images show that the morphology of the products is bamboo-like nanotube with open-end, tip-end and joint. HRTEM images show that the tip-end, joint and wall of bamboo-like nanotubes are of inorganic fullerene-like (IF-like) nanostructures. EDX results show that the components of bamboo-like nanotubes are Co, Mo, W and S. A possible formation mechanism of bamboo-like nanotubes was suggested.

Optics Express, 2013

We here report the integration of red emissive CuInS 2 based nanocrysals as a potential red phosp... more We here report the integration of red emissive CuInS 2 based nanocrysals as a potential red phosphor for warm light generation. By combining red emissive CuInS 2 based nanocrysals with commercial yellow emissive YAG:Ce and green emissive Eu 2+ doped silicate phosphors, we fabricated warm white light-emitting diodes with high color rendering index up to ~92, high luminous efficiency of 45~60 lm/W and color temperature less than 4000K.

Materials Letters, 2014

The successful synthesis of ZnS hollow microspheres by a solvothermal route is reported. The synt... more The successful synthesis of ZnS hollow microspheres by a solvothermal route is reported. The synthesis was achieved by a proper selection of a sulfur source, i.e., Na 2 S 2 O 3 ·5H 2 O or ͑NH 2 ͒ 2 CS, to react with Zn͑CH 3 COO͒ 2 ·2H 2 O in mixed solvents of ethylene glycol and deionized water. The ZnS products were characterized by X-ray diffraction ͑XRD͒, scanning electron microscopy ͑SEM͒, transmission electron microscopy ͑TEM͒, and photoluminescence spectroscopy. XRD identified the ZnS products to have either zinc blende or wurtzite structure. SEM images revealed hollow ZnS microspheres with 1 to 2 m diameters and 100 to 200 nm shell thicknesses. TEM images confirmed that the hollow ZnS microspheres were assembled by ZnS crystalline nanocrystallites. The room-temperature photoluminescence spectrum of the zinc blende hollow microspheres showed a strong green emission at 514 nm and weak emission at 379 nm. © 2009 International Centre for Diffraction Data.

Nanotechnology, 2014

Tunable optical emission properties from ferromagnetic semiconductors have not been well identifi... more Tunable optical emission properties from ferromagnetic semiconductors have not been well identified yet. In this work, high-quality Mn(II)-doped CdS nanowires and micrometer belts were prepared using a controlled chemical vapor deposition technique with time, precursor concentration, and temperature, in which Mn incorporation can be modulated. These wires or belts can produce both tunable redshifted emissions and ferromagnetic responses simultaneously upon doping. The strong emission bands at 572, 651, 693, 712, 745, 768, 787, and 803 nm, due to the Mn(II) 4 T 1 ( 4 G) → 6 A 1 ( 6 s) d-d transition, can be detected and accounted for by the aggregation of Mn ions at Cd sites in the CdS lattice at high temperature. These aggregates with ferromagnetism and shifted luminescence are related to the excitonic magnetic polaron (EMP) and localized EMP formations; this is verified by ab initio calculations. The correlation between aggregation-dependent optical emissions and ferromagnetic responses not only presents a new size effect for diluted magnetic semiconductors (DMSs), but also supplies a possible way to study or modulate the ferromagnetic properties of a DMS and to fabricate spin-related photonic devices in the Q1 future.

ChemInform, 2011

Cu-based ternary chalcogenides have received great interest as low-cost alternatives to conventio... more Cu-based ternary chalcogenides have received great interest as low-cost alternatives to conventional photovoltaic materials. In this work, a large quantity of single-crystalline, orthorhombic phase Cu 4 Bi 4 S 9 nanoribbons are fabricated using a facile solvothermal method. The growth of the Cu 4 Bi 4 S 9 nanoribbons is revealed to be a layer-by-layer stacking of Cu 4 Bi 4 S 9 thin slabs via dodecylamine (DDA) linker, in which the number of stacking layers, and, subsequently, the width-to-thickness ratio, depends on the DDA concentration. Optical investigations show that the as-prepared Cu 4 Bi 4 S 9 nanoribbons have a narrow bandgap of E g = 1.14 eV and enhanced surface photovoltage response in the entire visible wavelength range. It is indicated that these Cu 4 Bi 4 S 9 nanoribbons have potential application in photodetectors, solar cells, or other optoelectronic devices.

MRS Proceedings, 2009

ABSTRACT Superparamagnetic nanoparticles can find many applications in different fields with gree... more ABSTRACT Superparamagnetic nanoparticles can find many applications in different fields with greener techniques. The Fe3O4 nanoparticles less than 10nm coated with humic acid were synthesized by a chemical co-precipitation technique with cheap and environmental friendly iron salts and humic acid. The as-synthesized products were highly soluble in water. The efficacy for liver Magnetic resonance imaging (MRI) contrast agent was investigated by using it to the live rat and tumor-bearing rabbit models, on a conventional clinical 1.5 T MRI facility. Moreover the Fe3O4 –HA composite used in the Methylene Blue adsorption in neutral aqueous solution was studied too with high efficiency. The experimental results showed that the humic acid coated Fe3O4 superparamagnetic nanoparticles were suitalbe not only for liver MRI contrast agent, but also as adsorbents for removal of cationic organic dyes from neutral water.

Physical Review B, 1998

Transient grating of biphotonic holography is studied theoretically and experimentally in trans-c... more Transient grating of biphotonic holography is studied theoretically and experimentally in trans-cis isomerization azo materials. The theoretical description of the transient biphotonic holographic grating agrees well with experimental results in methyl yellow-polymethylmethacrylate and ethyl orange-polyvinylalcohol films. The mechanism of the biphotonic holographic grating in the azo materials can be attributed to the redistribution of cis isomers induced by both the

Photorefractive Materials, 1996

ABSTRACT

Principles and Applications, 2012

ABSTRACT