Tapas Chaudhuri - Academia.edu (original) (raw)
Uploads
Papers by Tapas Chaudhuri
SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011, 2012
ABSTRACT The optical properties of ZnO NRA films deposited by CBD have been investigated. NRA hav... more ABSTRACT The optical properties of ZnO NRA films deposited by CBD have been investigated. NRA having cavities between nanorods have high absorptance in solar region due to optical trapping. The use of ZnO NRA in enhancing the light harvesting properties of CdS and PbS thin films have been demonstrated.
MRS Proceedings, 2005
Electrodeposition (ED) is a potentially low-cost, non-vacuum, high-rate deposition process that c... more Electrodeposition (ED) is a potentially low-cost, non-vacuum, high-rate deposition process that can easily deposit uniform film on large non-planar substrates. In this paper, we report on successful biaxial textured electrodeposition of Ir on Ni-W substrates. Ir metal is well known for its excellent oxidation and corrosion resistance among platinumgroup elements; also, the lattice mismatch of cubic Ir is very close to that of CeO2 and Ni. The films were deposited in a vertical cell in which the electrodes (both working and counter) were suspended vertically from the top of the cell. The ED experiments were performed at 65°C without stirring the solution. The ED precursors were prepared at about -1.2 V from 2 to 15 minutes on Ni-W, where the Pt counter and Pt pseudo-reference electrodes were shorted together. To qualify the electrodeposited Ir buffer layer, a CeO2/YSZ/CeO2 and YSZ/CeO2 buffer structure was later deposited on ED Ir-coated Ni-W substrates by pulsed-laser deposition. The ED Ir/metal substrates were first heated at 800°C in 0.5 mTorr of forming gas, and then a CeO2 seed layer was deposited in 180 mTorr of forming gas. Subsequently, YSZ and CeO2 layers were deposited sequentially in 0.1 mTorr of oxygen.
Journal of Nanoscience and Nanotechnology, Sep 1, 2009
Journal of The Electrochemical Society, 2006
[Journal of The Electrochemical Society 153, C273 (2006)]. Raghu Bhattacharya, Sovannary Phok, Pr... more [Journal of The Electrochemical Society 153, C273 (2006)]. Raghu Bhattacharya, Sovannary Phok, Priscila Spagnol, Tapas Chaudhuri. Abstract. ... The deposition potential in our electrodeposition bath was checked by cyclic voltammetry (CV) study. ...
Materials Letters, Dec 1, 2007
A non-vacuum method for preparation of ZnO films via thermal oxidation of ZnS films deposited by ... more A non-vacuum method for preparation of ZnO films via thermal oxidation of ZnS films deposited by thin layer thermolysis is described. Transmission electron microscopic studies reveals that the films are polycrystalline with preferentially oriented along (100) direction and grain size of 5-10 nm. The films have about 95% transmission in the visible-near infrared (VIS-NIR) region and an energy band gap of 3.22 eV.
Japanese Journal of Applied Physics, Feb 1, 1990
A chemical method for preparing CuI thin films by iodination of solution grown Cu2S films is desc... more A chemical method for preparing CuI thin films by iodination of solution grown Cu2S films is described. X-ray characterization identifies γ-CuI and suggest that the films are polycrystalline in nature. SEM reveals a granular film morphology. Optical studies show that the band gap of the material is 2.93 eV. The sheet resistance of the films is in the range 1 to 3 k Ω/sq.
Materials Letters, Sep 1, 1989
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Nov 19, 2013
Thin Solid Films, Sep 1, 1981
Thin Solid Films, Jun 1, 2007
Cerium oxide thin films are deposited on glass by pulsed laser deposition at room temperature and... more Cerium oxide thin films are deposited on glass by pulsed laser deposition at room temperature and characterized by X-ray diffraction and atomic force microscopy. The effects of ambient gas, rate of deposition and fluence on growth of films have been studied. The films grown in forming gas and with a high rate of deposition are polycrystalline and show preferential orientation along b011N direction with a roughness of ∼ 2 nm. Films prepared in oxygen have low crystallinity.
International Journal of Energy Research, Aug 1, 1992
MRS Proceedings, 2005
Iridium film is a potential candidate as a buffer layer for yttrium barium copper oxide (YBCO) co... more Iridium film is a potential candidate as a buffer layer for yttrium barium copper oxide (YBCO) coated conductors. Pulsed laser deposition (PLD) of biaxially textured CeO2/yttrium stabilized zirconium oxide (YSZ) layers on electrodeposited Ir/Ni-W is reported. Biaxial texturing is obtained by deposition of a YSZ seed layer at 800°C in 10-6 Torr vacuum. X-ray diffraction (XRD) studies of Θ-2Θ and pole figure confirmed in-plane out-of-plane biaxial texturing with Δφ = 6.5° and Δω = 8°. Atomic force microscopy (AFM) revealed a surface with roughness of about 3 nm.
MRS Proceedings, 2005
Biaxially textured YBa2Cu307-δ films were fabricated by non-vacuum electrodeposition and spray py... more Biaxially textured YBa2Cu307-δ films were fabricated by non-vacuum electrodeposition and spray pyrolysis techniques. Electrodeposited YBCO was prepared on sputtered copper/single-crystal substrates. Electrodeposition was carried out at constant voltage and the deposition was completed in only few minutes. The thickness of the as-deposited films was in the range of 0.6 to 2 μm. The optimized sputtered copper layer thickness was about 200 Å on SrTiO3. In the spray pyrolysis method, the solution is sprayed directly onto SrTiO3 substrates. The substrate temperature is about 100°C. The thickness of the as-deposited films was in the range of 1.2 to 2μm. The electrodeposited and spray-deposited films were annealed at temperatures ranging from 800° to 920°C under various flowing gas mixtures. X-ray diffraction analysis revealed that processed electrodeposited and spray-deposited films were biaxially textured, where YBCO grains were well oriented along the c-axis and in the (a,b) plane. Δω, deduced from the rocking curve on the (005) reflection, was as low as 0.46°. Δφ, deduced from the phi-scan on the (103) reflection, was as low as 0.54°. The critical current density for these types of films is about 0.5 MA/cm2at 77 K and 0 T.
Physica C-superconductivity and Its Applications, Sep 1, 2006
Pulsed laser deposition (PLD) of biaxially textured Y2O3 stabilized ZrO2 (YSZ) layers on electrod... more Pulsed laser deposition (PLD) of biaxially textured Y2O3 stabilized ZrO2 (YSZ) layers on electrodeposited Ir/Ni–W tape is reported. Biaxial texturing is obtained by deposition of an YSZ seed layer at 800°C in 10−6Torr vacuum. X-ray diffraction (XRD) studies of θ–2θ and pole figures confirmed in-plane, out-of-plane biaxial texturing with Δϕ=8° and Δω=7.9°. Atomic force microscopy (AFM) revealed a surface with
Electrochemical and Solid State Letters, 2004
ABSTRACT Nonvacuum electrodeposition was used to prepare biaxially textured Ni coatings on Ni-W s... more ABSTRACT Nonvacuum electrodeposition was used to prepare biaxially textured Ni coatings on Ni-W substrates. The samples were characterized by X-ray diffraction (including theta/2 theta, pole figures, omega scans, and phi scans), and atomic force microscopy. Pole-figure scans show that electrodeposited (ED) Ni on textured Ni-W (3 atom %) is 99.3% cube textured. Full width at half-maximum values of the omega scan and phi scan of the electrodeposited Ni layers were comparable to the Ni-W base substrates, indicating good biaxial texturing. The buffer structures were completed on these types of seed ED-Ni layers by pulsed-laser-deposited (PLD) CeO2/YSZ/CeO2. We obtained a critical current density of 1.8 MA/cm(2) at 75.2 K in 600 Gauss magnetic field for PLD YBa2Cu3O7-delta/CeO2/YSZ/CeO2/ED-Ni/Ni-W. (C) 2004 The Electrochemical Society.
Materials Letters, Jul 1, 2005
Materials Letters, Mar 1, 2011
... ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT Page 1 of 8 One-minute microwave-assisted chemical ba... more ... ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT Page 1 of 8 One-minute microwave-assisted chemical bath deposition of nanostructured ZnO rod-arrays Anjana Kothari* and Tapas K Chaudhuri Dr. KC Patel Research and Development Centre Charotar University ...
Materials Research Bulletin, Mar 1, 1982
Thin Solid Films, Jun 1, 1982
SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011, 2012
ABSTRACT The optical properties of ZnO NRA films deposited by CBD have been investigated. NRA hav... more ABSTRACT The optical properties of ZnO NRA films deposited by CBD have been investigated. NRA having cavities between nanorods have high absorptance in solar region due to optical trapping. The use of ZnO NRA in enhancing the light harvesting properties of CdS and PbS thin films have been demonstrated.
MRS Proceedings, 2005
Electrodeposition (ED) is a potentially low-cost, non-vacuum, high-rate deposition process that c... more Electrodeposition (ED) is a potentially low-cost, non-vacuum, high-rate deposition process that can easily deposit uniform film on large non-planar substrates. In this paper, we report on successful biaxial textured electrodeposition of Ir on Ni-W substrates. Ir metal is well known for its excellent oxidation and corrosion resistance among platinumgroup elements; also, the lattice mismatch of cubic Ir is very close to that of CeO2 and Ni. The films were deposited in a vertical cell in which the electrodes (both working and counter) were suspended vertically from the top of the cell. The ED experiments were performed at 65°C without stirring the solution. The ED precursors were prepared at about -1.2 V from 2 to 15 minutes on Ni-W, where the Pt counter and Pt pseudo-reference electrodes were shorted together. To qualify the electrodeposited Ir buffer layer, a CeO2/YSZ/CeO2 and YSZ/CeO2 buffer structure was later deposited on ED Ir-coated Ni-W substrates by pulsed-laser deposition. The ED Ir/metal substrates were first heated at 800°C in 0.5 mTorr of forming gas, and then a CeO2 seed layer was deposited in 180 mTorr of forming gas. Subsequently, YSZ and CeO2 layers were deposited sequentially in 0.1 mTorr of oxygen.
Journal of Nanoscience and Nanotechnology, Sep 1, 2009
Journal of The Electrochemical Society, 2006
[Journal of The Electrochemical Society 153, C273 (2006)]. Raghu Bhattacharya, Sovannary Phok, Pr... more [Journal of The Electrochemical Society 153, C273 (2006)]. Raghu Bhattacharya, Sovannary Phok, Priscila Spagnol, Tapas Chaudhuri. Abstract. ... The deposition potential in our electrodeposition bath was checked by cyclic voltammetry (CV) study. ...
Materials Letters, Dec 1, 2007
A non-vacuum method for preparation of ZnO films via thermal oxidation of ZnS films deposited by ... more A non-vacuum method for preparation of ZnO films via thermal oxidation of ZnS films deposited by thin layer thermolysis is described. Transmission electron microscopic studies reveals that the films are polycrystalline with preferentially oriented along (100) direction and grain size of 5-10 nm. The films have about 95% transmission in the visible-near infrared (VIS-NIR) region and an energy band gap of 3.22 eV.
Japanese Journal of Applied Physics, Feb 1, 1990
A chemical method for preparing CuI thin films by iodination of solution grown Cu2S films is desc... more A chemical method for preparing CuI thin films by iodination of solution grown Cu2S films is described. X-ray characterization identifies γ-CuI and suggest that the films are polycrystalline in nature. SEM reveals a granular film morphology. Optical studies show that the band gap of the material is 2.93 eV. The sheet resistance of the films is in the range 1 to 3 k Ω/sq.
Materials Letters, Sep 1, 1989
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Nov 19, 2013
Thin Solid Films, Sep 1, 1981
Thin Solid Films, Jun 1, 2007
Cerium oxide thin films are deposited on glass by pulsed laser deposition at room temperature and... more Cerium oxide thin films are deposited on glass by pulsed laser deposition at room temperature and characterized by X-ray diffraction and atomic force microscopy. The effects of ambient gas, rate of deposition and fluence on growth of films have been studied. The films grown in forming gas and with a high rate of deposition are polycrystalline and show preferential orientation along b011N direction with a roughness of ∼ 2 nm. Films prepared in oxygen have low crystallinity.
International Journal of Energy Research, Aug 1, 1992
MRS Proceedings, 2005
Iridium film is a potential candidate as a buffer layer for yttrium barium copper oxide (YBCO) co... more Iridium film is a potential candidate as a buffer layer for yttrium barium copper oxide (YBCO) coated conductors. Pulsed laser deposition (PLD) of biaxially textured CeO2/yttrium stabilized zirconium oxide (YSZ) layers on electrodeposited Ir/Ni-W is reported. Biaxial texturing is obtained by deposition of a YSZ seed layer at 800°C in 10-6 Torr vacuum. X-ray diffraction (XRD) studies of Θ-2Θ and pole figure confirmed in-plane out-of-plane biaxial texturing with Δφ = 6.5° and Δω = 8°. Atomic force microscopy (AFM) revealed a surface with roughness of about 3 nm.
MRS Proceedings, 2005
Biaxially textured YBa2Cu307-δ films were fabricated by non-vacuum electrodeposition and spray py... more Biaxially textured YBa2Cu307-δ films were fabricated by non-vacuum electrodeposition and spray pyrolysis techniques. Electrodeposited YBCO was prepared on sputtered copper/single-crystal substrates. Electrodeposition was carried out at constant voltage and the deposition was completed in only few minutes. The thickness of the as-deposited films was in the range of 0.6 to 2 μm. The optimized sputtered copper layer thickness was about 200 Å on SrTiO3. In the spray pyrolysis method, the solution is sprayed directly onto SrTiO3 substrates. The substrate temperature is about 100°C. The thickness of the as-deposited films was in the range of 1.2 to 2μm. The electrodeposited and spray-deposited films were annealed at temperatures ranging from 800° to 920°C under various flowing gas mixtures. X-ray diffraction analysis revealed that processed electrodeposited and spray-deposited films were biaxially textured, where YBCO grains were well oriented along the c-axis and in the (a,b) plane. Δω, deduced from the rocking curve on the (005) reflection, was as low as 0.46°. Δφ, deduced from the phi-scan on the (103) reflection, was as low as 0.54°. The critical current density for these types of films is about 0.5 MA/cm2at 77 K and 0 T.
Physica C-superconductivity and Its Applications, Sep 1, 2006
Pulsed laser deposition (PLD) of biaxially textured Y2O3 stabilized ZrO2 (YSZ) layers on electrod... more Pulsed laser deposition (PLD) of biaxially textured Y2O3 stabilized ZrO2 (YSZ) layers on electrodeposited Ir/Ni–W tape is reported. Biaxial texturing is obtained by deposition of an YSZ seed layer at 800°C in 10−6Torr vacuum. X-ray diffraction (XRD) studies of θ–2θ and pole figures confirmed in-plane, out-of-plane biaxial texturing with Δϕ=8° and Δω=7.9°. Atomic force microscopy (AFM) revealed a surface with
Electrochemical and Solid State Letters, 2004
ABSTRACT Nonvacuum electrodeposition was used to prepare biaxially textured Ni coatings on Ni-W s... more ABSTRACT Nonvacuum electrodeposition was used to prepare biaxially textured Ni coatings on Ni-W substrates. The samples were characterized by X-ray diffraction (including theta/2 theta, pole figures, omega scans, and phi scans), and atomic force microscopy. Pole-figure scans show that electrodeposited (ED) Ni on textured Ni-W (3 atom %) is 99.3% cube textured. Full width at half-maximum values of the omega scan and phi scan of the electrodeposited Ni layers were comparable to the Ni-W base substrates, indicating good biaxial texturing. The buffer structures were completed on these types of seed ED-Ni layers by pulsed-laser-deposited (PLD) CeO2/YSZ/CeO2. We obtained a critical current density of 1.8 MA/cm(2) at 75.2 K in 600 Gauss magnetic field for PLD YBa2Cu3O7-delta/CeO2/YSZ/CeO2/ED-Ni/Ni-W. (C) 2004 The Electrochemical Society.
Materials Letters, Jul 1, 2005
Materials Letters, Mar 1, 2011
... ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT Page 1 of 8 One-minute microwave-assisted chemical ba... more ... ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT Page 1 of 8 One-minute microwave-assisted chemical bath deposition of nanostructured ZnO rod-arrays Anjana Kothari* and Tapas K Chaudhuri Dr. KC Patel Research and Development Centre Charotar University ...
Materials Research Bulletin, Mar 1, 1982
Thin Solid Films, Jun 1, 1982