Yu-Hsu Chang | National Taipei University of Technology (original) (raw)

Papers by Yu-Hsu Chang

Research paper thumbnail of A new solution route for the synthesis of CuFeO2 and Mg-doped CuFeO2 as catalysts for dye degradation and CO2 conversion

Journal of Alloys and Compounds, 2021

Research paper thumbnail of Crystals via Vapor-Solid Reactions

Crystalline graphite and Si showing fertile morphologies are prepared via vapor-solid reaction gr... more Crystalline graphite and Si showing fertile morphologies are prepared via vapor-solid reaction growth (VSRG). By reacting CaC2 with vapors of CxCly (CxCly: CCl4, C2Cl4, C4Cl6, and C5Cl6), porous, fibrous, and planar graphite were obtained at 973-1023, 1073-1123, and 1123-1223 K, respectively. Employing SiCl4 to react with MxSiy (MxSiy: Mg2Si and CaSi2) generated many Si structures. These include clustered-particle and porous, wirelike, corallike, and planar or platelike at 1023, 1073, 1123, and 1223 K, respectively. The reaction products, the network solids (graphite and Si) and the ionic solids MCl2, phase-segregated into self-templating molds and casts and develop cooperatively into various three-dimensional structures. Final morphology of the network solids depends not only on the reaction temperature but their molar volume ratio to the MCl2 salt products. 1.

Research paper thumbnail of A disposable electrochemical sensor based on iron molybdate for the analysis of dopamine in biological samples

New Journal of Chemistry, 2021

Developing cost-effective approaches for the fabrication of electrochemical devices is instantly ... more Developing cost-effective approaches for the fabrication of electrochemical devices is instantly needed for transferring from basic research to point-care technology.

Research paper thumbnail of Photochemical synthesis of Au nanostars on PMMA films by ethanol action as flexible SERS substrates for in-situ detection of antibiotics on curved surfaces

Chemical Engineering Journal, 2022

Research paper thumbnail of Photochemical synthesis of Ag/Au/AgCl heterostructure from Ag nanowires as a reusable SERS substrate for ultrasensitive detection of analgesics and antibiotics

Chemical Engineering Journal, 2021

Abstract The composite nanostructure composed of semiconductors and noble-metals have received wi... more Abstract The composite nanostructure composed of semiconductors and noble-metals have received widespread attention in the field of surface-enhanced Raman scattering (SERS). Herein, one-dimensional (1D) silver/gold/silver-chloride nanowires (Ag/Au/AgCl NWs) are prepared using the facile hydrothermal and photoreduction processes for the SERS detection of antibiotics and analgesics. The nanometer-scale interparticle gaps in the Ag/Au/AgCl heterostructure have been produced and the hotspots are provoked to enhance the SERS signal of target molecules by boosting the synergistic action of the heterostructure. The Ag/Au/AgCl heterostructure offers high sensitivity, good uniformity and high reproducibility. Meanwhile, the SERS substrate based on the Ag/Au/AgCl heterostructure is studied for the determination of paracetamol (PCT) and furazolidone (FZD) with the wide linear ranges of 10-1 M ~ 10-10 M and 10-1 M ~ 10-9 M. Their corresponding limits of detection (LOD) are as low as 2.8 × 10-12 M and 1.9 × 10-11 M, respectively. The separate and multiplex detection of PCT and FZD by the Ag/Au/AgCl heterostructure have been performed. Furthermore, the Ag/Au/AgCl heterostructure is successfully applied to determine the PCT and the FZD in the human urine samples with satisfactory results. To ensure the self-reviving ability of Ag/Au/AgCl heterostructure, the photodegradation of PCT and FZD molecules has been conducted and analyzed. The SERS substrate based on the semiconductor/noble-metal heterostructure with the self-reviving capability paves the way for the accurate detection of biologically important molecules like antibiotics and analgesics at the ultralow-level concentrations.

Research paper thumbnail of Synthesis of monodispersed hexagonal and star-like gibbsite nanoplatelets by sol-gel method

Research paper thumbnail of Two-dimensional titanium carbide (MXene) nanosheets as an efficient electrocatalyst for 4-nitroquinoline N-oxide detection

Journal of Molecular Liquids, 2020

Abstract Two-dimensional (2D) MXene-based electrode materials have recently gained attention in t... more Abstract Two-dimensional (2D) MXene-based electrode materials have recently gained attention in the field of electrochemical sensors. Herein, we report the first titanium carbide (TiC)-based electrochemical sensor for the detection of 4-nitroquinoline N-oxide (4-NO). X-ray diffraction, field emission scanning electron microscopy, elemental mapping, and energy-dispersive X-ray spectroscopy were used to examine the structural and compositional properties of TiC. With the 2D MXene structure, the TiC-modified electrode provides excellent conductivity, an electron transfer boost, large surface area, and nanoscale effects, which improve the electrochemical activity for 4-NO detection. The fabricated electrochemical sensor shows a strong voltammetry performance at −0.32 V with a wide linear range (0.01–114 μM and 133–650 μM) and a low limit of detection (2 nM) for 4-NO detection. The real-time analysis of 4-NO content in biological samples was successfully conducted and afforded good recoveries. Our method of design produces an efficient electrode material for 4-NO detection with outstanding electrochemical performance.

Research paper thumbnail of Development of SERS platform based on ZnO multipods decorated with Ag nanospheres for detection of 4-nitrophenol and rhodamine 6G in real samples

Microchemical Journal, 2021

Abstract Noble-metal/semiconductor-based nanomaterials have attained high Raman enhancement in th... more Abstract Noble-metal/semiconductor-based nanomaterials have attained high Raman enhancement in the surface-enhanced Raman scattering (SERS) sensor. The fabrication of noble-metal/semiconductor-based SERS substrates with high sensitivity and good reproducibility is a great challenge. Noble-metal nanoparticles on semiconductor have strong capability to resonate the organic molecule adsorbed on them for the SERS enhancement. In this work, silver nanospheres (Ag NSs) decorated on zinc-oxide (ZnO) multipods are produced as a noble-metal/semiconductor-based SERS substrate and the effect of mixing ratio between Ag NSs and ZnO multipods is systemically studied. The optimized Ag/ZnO SERS substrate shows the superior SERS performance for the detection of 4-nitrophenol (4-NP) and rhodamine 6G (R6G). The corresponding limits of detection are 1.49 × 10−13 M and 9.99 × 10−12 M with the analytical enhancement factor of 4.27 × 1010 for 4-NP and 1.97 × 109 for R6G. The strong SERS enhancement is attributed to the synergistic effect of electromagnetic mechanism and chemical mechanism. Physical and chemical characteristics of Ag/ZnO-multipod structure were studied using field emission scanning electron microscopy, X-ray diffraction, elemental mapping, energy-dispersive X-ray spectroscopy and UV–Vis spectroscopy. The proposed Ag/ZnO-multipod structure has excellent uniformity and reproducibility with the relative standard deviation less than 6%. The real-sample analysis of 4-NP and R6G in river water is experimentally carried out and gives the satisfactory recovery values > 84%. This study reveals that the Ag/ZnO-multipods are practically applicable as a highly sensitive SERS substrate.

Research paper thumbnail of Ultrasensitive and reusable SERS probe for the detection of synthetic dyes in food industry through hybrid flower-shaped ZnO@Ag nanostructures

Journal of Alloys and Compounds, 2021

Research paper thumbnail of Significant increases in the dielectric properties of Zn2+-modified porous clay and bacterial cellulose composite sheets

Journal of Materials Science: Materials in Electronics, 2021

Zn2+-modified porous clay and bacterial cellulose composite sheets were successfully prepared. Po... more Zn2+-modified porous clay and bacterial cellulose composite sheets were successfully prepared. Porous clay was synthesized by reacting with cetrimonium chloride through a surfactant template method. Zn2+ (3, 5 and 10 wt%) was chemically modified on the surface of the porous clay. No significant change in structural properties was observed by FTIR and XRD analysis. The zeta potential was between − 20 to − 25 mV. The specific surface area, pore volume and pore size were 380–450 m2/g, 0.25–03 cm3/g and 5.5–6 nm, respectively. Next, the Zn2+-modified porous clay was embedded into a bacterial cellulose sheet. Zn2+ existed on the surface and inside the bacterial cellulose sheet and was uniformly distributed, as observed by EDX. Significant increases in dielectric properties were reported when the Zn2+-modified porous clay was integrated into the bacterial cellulose composite. Remarkably, the composite demonstrated outstanding properties as a dielectric material.

Research paper thumbnail of Utilization of Palm Olein-Based Polyol for Polyurethane Foam Sponge Synthesis: Potential as a Sorbent Material

Journal of Polymers and the Environment, 2020

Research paper thumbnail of Gold Nanohelices: A New Synthesis Route, Characterization and Plasmonic EField Enhancement

Research paper thumbnail of Numerical simulation of nanopost-guided self-organization dendritic architectures using phase-field model

Research paper thumbnail of Helical Structure-Dependent Surface-Enhanced Raman Spectroscopy Enhancement in Gold Nanohelices

The Journal of Physical Chemistry C, 2019

Research paper thumbnail of Surfactant-assisted galvanic synthesis and growth characteristics of copper nanowires

Inorganic Chemistry Frontiers, 2018

One-dimensional copper nanowires (CuNWs) are synthesized on a large-scale using a cetyltrimethyla... more One-dimensional copper nanowires (CuNWs) are synthesized on a large-scale using a cetyltrimethylammonium chloride-assisted galvanic replacement reaction on aluminum substrates.

Research paper thumbnail of The synthesis of a gold nanodisk–molecular layer–gold film vertical structure: a molecular layer as the spacer for SERS hot spot investigations

Materials Chemistry Frontiers, 2017

3D structures of Au nanodisk–molecules–Au film are synthesized for a systematic measurement of SE... more 3D structures of Au nanodisk–molecules–Au film are synthesized for a systematic measurement of SERS hot spots.

Research paper thumbnail of An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Journal of Visualized Experiments, 2017

Research paper thumbnail of Rectangular copper nanotubes

RSC Advances, 2015

A straightforward galvanic displacement reaction was adopted to synthesize structurally novel rec... more A straightforward galvanic displacement reaction was adopted to synthesize structurally novel rectangular Cu nanotubes. This 1D nanomaterial displayed excellent field emission properties and a favorable catalytic effect in the degradation of methylene blue in H2O2 solutions.

Research paper thumbnail of Magnetron sputtering process of carbon-doped α-Fe2O3 thin films for photoelectrochemical water splitting

Journal of Alloys and Compounds, 2015

ABSTRACT Thin films of α-Fe2O3 doped with carbon have been fabricated on F-doped SnO2 glass subst... more ABSTRACT Thin films of α-Fe2O3 doped with carbon have been fabricated on F-doped SnO2 glass substrate by magnetron sputtering process via DC power on the pure Fe target (99.99%) combined with RF power on the pure graphite target (99.99%). The influences of RF power (0, 40, 80 and 120 W) on optical, structural and photoelectrochemical (PEC) characteristics have been investigated. The as-obtained samples after annealing in Ar ambient were analyzed by scanning electron microscopy, X-ray diffraction (XRD), Raman spectra, UV–visible spectra and electrochemical analysis. After annealing, all samples revealed only hematite characteristics in XRD pattern and Raman spectra. Thickness of annealed thin films was ∼350 nm measured via SEM cross-section image. The optical band gap and carrier concentration of samples were in the range of 2.13–2.16 eV and 6.28 × 1017 to 3.11 × 1018 cm−3, respectively. Based upon our observations, the 4.56 at.% carbon-doped α-Fe2O3 thin film deposited via 80 W RF power has a better PEC response with photocurrent density of ∼1.18 mA/cm2 at 0.6 V vs. SCE. This value was about three times higher than the un-doped film (0 W of RF power, reference sample). Observed higher photocurrent density was likely due to a suitable carbon-doping concentration causing a higher carrier concentration.

Research paper thumbnail of Gold nanospirals

RSC Advances, 2015

This study used a galvanic displacement reaction for aluminum-gold oxidation–reduction and added ... more This study used a galvanic displacement reaction for aluminum-gold oxidation–reduction and added surfactants to act as capping agents to control the morphology and size of gold growth.

Research paper thumbnail of A new solution route for the synthesis of CuFeO2 and Mg-doped CuFeO2 as catalysts for dye degradation and CO2 conversion

Journal of Alloys and Compounds, 2021

Research paper thumbnail of Crystals via Vapor-Solid Reactions

Crystalline graphite and Si showing fertile morphologies are prepared via vapor-solid reaction gr... more Crystalline graphite and Si showing fertile morphologies are prepared via vapor-solid reaction growth (VSRG). By reacting CaC2 with vapors of CxCly (CxCly: CCl4, C2Cl4, C4Cl6, and C5Cl6), porous, fibrous, and planar graphite were obtained at 973-1023, 1073-1123, and 1123-1223 K, respectively. Employing SiCl4 to react with MxSiy (MxSiy: Mg2Si and CaSi2) generated many Si structures. These include clustered-particle and porous, wirelike, corallike, and planar or platelike at 1023, 1073, 1123, and 1223 K, respectively. The reaction products, the network solids (graphite and Si) and the ionic solids MCl2, phase-segregated into self-templating molds and casts and develop cooperatively into various three-dimensional structures. Final morphology of the network solids depends not only on the reaction temperature but their molar volume ratio to the MCl2 salt products. 1.

Research paper thumbnail of A disposable electrochemical sensor based on iron molybdate for the analysis of dopamine in biological samples

New Journal of Chemistry, 2021

Developing cost-effective approaches for the fabrication of electrochemical devices is instantly ... more Developing cost-effective approaches for the fabrication of electrochemical devices is instantly needed for transferring from basic research to point-care technology.

Research paper thumbnail of Photochemical synthesis of Au nanostars on PMMA films by ethanol action as flexible SERS substrates for in-situ detection of antibiotics on curved surfaces

Chemical Engineering Journal, 2022

Research paper thumbnail of Photochemical synthesis of Ag/Au/AgCl heterostructure from Ag nanowires as a reusable SERS substrate for ultrasensitive detection of analgesics and antibiotics

Chemical Engineering Journal, 2021

Abstract The composite nanostructure composed of semiconductors and noble-metals have received wi... more Abstract The composite nanostructure composed of semiconductors and noble-metals have received widespread attention in the field of surface-enhanced Raman scattering (SERS). Herein, one-dimensional (1D) silver/gold/silver-chloride nanowires (Ag/Au/AgCl NWs) are prepared using the facile hydrothermal and photoreduction processes for the SERS detection of antibiotics and analgesics. The nanometer-scale interparticle gaps in the Ag/Au/AgCl heterostructure have been produced and the hotspots are provoked to enhance the SERS signal of target molecules by boosting the synergistic action of the heterostructure. The Ag/Au/AgCl heterostructure offers high sensitivity, good uniformity and high reproducibility. Meanwhile, the SERS substrate based on the Ag/Au/AgCl heterostructure is studied for the determination of paracetamol (PCT) and furazolidone (FZD) with the wide linear ranges of 10-1 M ~ 10-10 M and 10-1 M ~ 10-9 M. Their corresponding limits of detection (LOD) are as low as 2.8 × 10-12 M and 1.9 × 10-11 M, respectively. The separate and multiplex detection of PCT and FZD by the Ag/Au/AgCl heterostructure have been performed. Furthermore, the Ag/Au/AgCl heterostructure is successfully applied to determine the PCT and the FZD in the human urine samples with satisfactory results. To ensure the self-reviving ability of Ag/Au/AgCl heterostructure, the photodegradation of PCT and FZD molecules has been conducted and analyzed. The SERS substrate based on the semiconductor/noble-metal heterostructure with the self-reviving capability paves the way for the accurate detection of biologically important molecules like antibiotics and analgesics at the ultralow-level concentrations.

Research paper thumbnail of Synthesis of monodispersed hexagonal and star-like gibbsite nanoplatelets by sol-gel method

Research paper thumbnail of Two-dimensional titanium carbide (MXene) nanosheets as an efficient electrocatalyst for 4-nitroquinoline N-oxide detection

Journal of Molecular Liquids, 2020

Abstract Two-dimensional (2D) MXene-based electrode materials have recently gained attention in t... more Abstract Two-dimensional (2D) MXene-based electrode materials have recently gained attention in the field of electrochemical sensors. Herein, we report the first titanium carbide (TiC)-based electrochemical sensor for the detection of 4-nitroquinoline N-oxide (4-NO). X-ray diffraction, field emission scanning electron microscopy, elemental mapping, and energy-dispersive X-ray spectroscopy were used to examine the structural and compositional properties of TiC. With the 2D MXene structure, the TiC-modified electrode provides excellent conductivity, an electron transfer boost, large surface area, and nanoscale effects, which improve the electrochemical activity for 4-NO detection. The fabricated electrochemical sensor shows a strong voltammetry performance at −0.32 V with a wide linear range (0.01–114 μM and 133–650 μM) and a low limit of detection (2 nM) for 4-NO detection. The real-time analysis of 4-NO content in biological samples was successfully conducted and afforded good recoveries. Our method of design produces an efficient electrode material for 4-NO detection with outstanding electrochemical performance.

Research paper thumbnail of Development of SERS platform based on ZnO multipods decorated with Ag nanospheres for detection of 4-nitrophenol and rhodamine 6G in real samples

Microchemical Journal, 2021

Abstract Noble-metal/semiconductor-based nanomaterials have attained high Raman enhancement in th... more Abstract Noble-metal/semiconductor-based nanomaterials have attained high Raman enhancement in the surface-enhanced Raman scattering (SERS) sensor. The fabrication of noble-metal/semiconductor-based SERS substrates with high sensitivity and good reproducibility is a great challenge. Noble-metal nanoparticles on semiconductor have strong capability to resonate the organic molecule adsorbed on them for the SERS enhancement. In this work, silver nanospheres (Ag NSs) decorated on zinc-oxide (ZnO) multipods are produced as a noble-metal/semiconductor-based SERS substrate and the effect of mixing ratio between Ag NSs and ZnO multipods is systemically studied. The optimized Ag/ZnO SERS substrate shows the superior SERS performance for the detection of 4-nitrophenol (4-NP) and rhodamine 6G (R6G). The corresponding limits of detection are 1.49 × 10−13 M and 9.99 × 10−12 M with the analytical enhancement factor of 4.27 × 1010 for 4-NP and 1.97 × 109 for R6G. The strong SERS enhancement is attributed to the synergistic effect of electromagnetic mechanism and chemical mechanism. Physical and chemical characteristics of Ag/ZnO-multipod structure were studied using field emission scanning electron microscopy, X-ray diffraction, elemental mapping, energy-dispersive X-ray spectroscopy and UV–Vis spectroscopy. The proposed Ag/ZnO-multipod structure has excellent uniformity and reproducibility with the relative standard deviation less than 6%. The real-sample analysis of 4-NP and R6G in river water is experimentally carried out and gives the satisfactory recovery values > 84%. This study reveals that the Ag/ZnO-multipods are practically applicable as a highly sensitive SERS substrate.

Research paper thumbnail of Ultrasensitive and reusable SERS probe for the detection of synthetic dyes in food industry through hybrid flower-shaped ZnO@Ag nanostructures

Journal of Alloys and Compounds, 2021

Research paper thumbnail of Significant increases in the dielectric properties of Zn2+-modified porous clay and bacterial cellulose composite sheets

Journal of Materials Science: Materials in Electronics, 2021

Zn2+-modified porous clay and bacterial cellulose composite sheets were successfully prepared. Po... more Zn2+-modified porous clay and bacterial cellulose composite sheets were successfully prepared. Porous clay was synthesized by reacting with cetrimonium chloride through a surfactant template method. Zn2+ (3, 5 and 10 wt%) was chemically modified on the surface of the porous clay. No significant change in structural properties was observed by FTIR and XRD analysis. The zeta potential was between − 20 to − 25 mV. The specific surface area, pore volume and pore size were 380–450 m2/g, 0.25–03 cm3/g and 5.5–6 nm, respectively. Next, the Zn2+-modified porous clay was embedded into a bacterial cellulose sheet. Zn2+ existed on the surface and inside the bacterial cellulose sheet and was uniformly distributed, as observed by EDX. Significant increases in dielectric properties were reported when the Zn2+-modified porous clay was integrated into the bacterial cellulose composite. Remarkably, the composite demonstrated outstanding properties as a dielectric material.

Research paper thumbnail of Utilization of Palm Olein-Based Polyol for Polyurethane Foam Sponge Synthesis: Potential as a Sorbent Material

Journal of Polymers and the Environment, 2020

Research paper thumbnail of Gold Nanohelices: A New Synthesis Route, Characterization and Plasmonic EField Enhancement

Research paper thumbnail of Numerical simulation of nanopost-guided self-organization dendritic architectures using phase-field model

Research paper thumbnail of Helical Structure-Dependent Surface-Enhanced Raman Spectroscopy Enhancement in Gold Nanohelices

The Journal of Physical Chemistry C, 2019

Research paper thumbnail of Surfactant-assisted galvanic synthesis and growth characteristics of copper nanowires

Inorganic Chemistry Frontiers, 2018

One-dimensional copper nanowires (CuNWs) are synthesized on a large-scale using a cetyltrimethyla... more One-dimensional copper nanowires (CuNWs) are synthesized on a large-scale using a cetyltrimethylammonium chloride-assisted galvanic replacement reaction on aluminum substrates.

Research paper thumbnail of The synthesis of a gold nanodisk–molecular layer–gold film vertical structure: a molecular layer as the spacer for SERS hot spot investigations

Materials Chemistry Frontiers, 2017

3D structures of Au nanodisk–molecules–Au film are synthesized for a systematic measurement of SE... more 3D structures of Au nanodisk–molecules–Au film are synthesized for a systematic measurement of SERS hot spots.

Research paper thumbnail of An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Journal of Visualized Experiments, 2017

Research paper thumbnail of Rectangular copper nanotubes

RSC Advances, 2015

A straightforward galvanic displacement reaction was adopted to synthesize structurally novel rec... more A straightforward galvanic displacement reaction was adopted to synthesize structurally novel rectangular Cu nanotubes. This 1D nanomaterial displayed excellent field emission properties and a favorable catalytic effect in the degradation of methylene blue in H2O2 solutions.

Research paper thumbnail of Magnetron sputtering process of carbon-doped α-Fe2O3 thin films for photoelectrochemical water splitting

Journal of Alloys and Compounds, 2015

ABSTRACT Thin films of α-Fe2O3 doped with carbon have been fabricated on F-doped SnO2 glass subst... more ABSTRACT Thin films of α-Fe2O3 doped with carbon have been fabricated on F-doped SnO2 glass substrate by magnetron sputtering process via DC power on the pure Fe target (99.99%) combined with RF power on the pure graphite target (99.99%). The influences of RF power (0, 40, 80 and 120 W) on optical, structural and photoelectrochemical (PEC) characteristics have been investigated. The as-obtained samples after annealing in Ar ambient were analyzed by scanning electron microscopy, X-ray diffraction (XRD), Raman spectra, UV–visible spectra and electrochemical analysis. After annealing, all samples revealed only hematite characteristics in XRD pattern and Raman spectra. Thickness of annealed thin films was ∼350 nm measured via SEM cross-section image. The optical band gap and carrier concentration of samples were in the range of 2.13–2.16 eV and 6.28 × 1017 to 3.11 × 1018 cm−3, respectively. Based upon our observations, the 4.56 at.% carbon-doped α-Fe2O3 thin film deposited via 80 W RF power has a better PEC response with photocurrent density of ∼1.18 mA/cm2 at 0.6 V vs. SCE. This value was about three times higher than the un-doped film (0 W of RF power, reference sample). Observed higher photocurrent density was likely due to a suitable carbon-doping concentration causing a higher carrier concentration.

Research paper thumbnail of Gold nanospirals

RSC Advances, 2015

This study used a galvanic displacement reaction for aluminum-gold oxidation–reduction and added ... more This study used a galvanic displacement reaction for aluminum-gold oxidation–reduction and added surfactants to act as capping agents to control the morphology and size of gold growth.