scholarly journals Indium Tin-Oxide Wrapped 3D rGO and TiO2 Composites: Development, Characterization, and Enhancing Photocatalytic Activity for Methylene Blue

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 848
Author(s):  
Cheng Gong ◽  
Shiyin Xu ◽  
Peng Xiao ◽  
Feifan Liu ◽  
Yunhui Xu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
3D Structure ◽  
Charge Transfer Resistance ◽  
Layer By Layer ◽  
Transfer Resistance ◽  
Photodegradation Rate ◽  
Reduced Graphene ◽  
Low Charge

A hybrid material of indium tin-oxide (ITO) wrapped titanium dioxide and reduced graphene oxide (ITO-rGO and TiO2) was prepared using a facile hydrothermal technique. TiO2 nanorods were in situ grown on the surface of rGO (rGO and TiO2), and which was then assembled onto ITO substrate layer by layer with formation of a 3D structure. ITO-rGO and TiO2 exhibit low charge transfer resistance at the electrode-electrolyte interface and have good photoresponsive ability. Methylene blue (MB) can be effectively adsorbed and enriched onto ITO-rGO and TiO2 surface. The adsorption kinetics and thermodynamics of ITO-rGO and TiO2 were evaluated, showing that the exothermic and entropy-driven reaction were the main thermodynamic processes, and the Langmuir isotherm was the ideal model for adsorption fitting. Meanwhile, ITO greatly improved degradation of rGO and TiO2 because electrons can be collected by ITO before recombination and MB can easily enter into the 3D structure of rGO and TiO2. The highest photodegradation rate of MB reached 93.40% for ITO-rGO and TiO2 at pH 9. Additionally, ITO-rGO and TiO2 successfully solved the problems of being difficult to recycle and causing secondary pollution of traditional TiO2 catalysts. Therefore, ITO-rGO and TiO2 may be a potential photocatalyst for degrading organic pollutants in water.

scholarly journals Oxygen-Deficient WO3/TiO2/CC Nanorod Arrays for Visible-Light Photocatalytic Degradation of Methylene Blue

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1349
Author(s):  
Liaochuan Jiang ◽  
Xingyuan Gao ◽  
Shaoling Chen ◽  
Jangam Ashok ◽  
Sibudjing Kawi
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Electrochemical Reduction ◽  
Separation Efficiency ◽  
Photogenerated Electron ◽  
Charge Transfer Resistance ◽  
High Photocatalytic Activity ◽  
Carbon Cloth ◽  
Transfer Resistance ◽  
Construction Of Self

At present, TiO2 is one of the most widely used photocatalytic materials. However, the narrow response range to light limits the photocatalytic performance. Herein, we reported a successful construction of self-doped R-WO3/R-TiO2/CC nanocomposites on flexible carbon cloth (CC) via electrochemical reduction to increase the oxygen vacancies (Ovs), resulting in an enhanced separation efficiency of photo-induced charge carriers. The photocurrent of R-WO3/R-TiO2/CC at −1.6 V (vs. SCE) was 2.6 times higher than that of WO3/TiO2/CC, which suggested that Ovs could improve the response to sunlight. Moreover, the photocatalytic activity of R-WO3/TiO2/CC was explored using methylene blue (MB). The degradation rate of MB could reach 68%, which was 1.3 times and 3.8 times higher than that of WO3/TiO2/CC and TiO2/CC, respectively. Furthermore, the solution resistance and charge transfer resistance of R-WO3/R-TiO2/CC were obviously decreased. Therefore, the electrochemical reduction of nanomaterials enabled a promoted separation of photogenerated electron–hole pairs, leading to high photocatalytic activity.

scholarly journals Electrochemical Impedance Characterization of Cell Growth on Reduced Graphene Oxide–Gold Nanoparticles Electrodeposited on Indium Tin Oxide Electrodes

2019 ◽  
Vol 9 (2) ◽  
pp. 326 ◽  
Author(s):  
Somasekhar Chinnadayyala ◽  
Jinsoo Park ◽  
Yonghyun Choi ◽  
Jae-Hee Han ◽  
Ajay Yagati ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Cell Growth ◽  
Reduced Graphene Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochemical Impedance ◽  
Hek293 Cells ◽  
Ito Electrode ◽  
Reduced Graphene

The improved binding ability of graphene–nanoparticle composites to proteins or molecules can be utilized to develop new cell-based assays. In this study, we fabricated reduced graphene oxide–gold nanoparticles (rGO-AuNP) electrodeposited onto a transparent indium tin oxide (ITO) electrode and investigated the feasibility of the electrochemical impedance monitoring of cell growth. The electrodeposition of rGO–AuNP on the ITO was optically and electrochemically characterized in comparison to bare, rGO-, and AuNP-deposited electrodes. The cell growth on the rGO–AuNP/ITO electrode was analyzed via electrochemical impedance measurement together with the microscopic observation of HEK293 cells transfected with a green fluorescent protein expression vector. The results showed that rGO–AuNP was biocompatible and induced an increase in cell adherence to the electrode when compared to the bare, AuNP-, or rGO-deposited ITO electrode. At 54 h cultivation, the average and standard deviation of the saturated normalized impedance magnitude of the rGO–AuNP/ITO electrode was 3.44 ± 0.16, while the value of the bare, AuNP-, and rGO-deposited ITO electrode was 2.48 ± 0.15, 2.61 ± 0.18, and 3.01 ± 0.25, respectively. The higher saturated value of the cell impedance indicates that the impedimetric cell-based assay has a broader measurement range. Thus, the rGO–AuNP/ITO electrode can be utilized for label-free and real-time impedimetric cell-based assays with wider dynamic range.

Electrochemical Characterization of Poly-L-Lysine Coating on Indium Tin Oxide Electrode for Enhancing Cell Adhesion

2015 ◽  
Vol 15 (10) ◽  
pp. 7881-7885 ◽  
Author(s):  
Yonghyun Choi ◽  
Ajay Kumar Yagati ◽  
Sungbo Cho
Keyword(s):  
Cell Adhesion ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
High Throughput Screening ◽  
Impedance Analysis ◽  
Electrochemical Characteristics ◽  
Transfer Resistance ◽  
Indium Tin Oxide Electrode ◽  
Redox Peak ◽  
Cell Chip

Nano or microelectrode-based cell chip for stimulating or recording neuronal signals requires better cell adhesion procedures in order to achieve efficient cell based assays for effective cellular diagnosis and for high throughput screening of drug candidates. The cells can be adhered on protein pre-coated sensing electrodes, but the electrochemical characteristics of cells are highly influenced by the electrical charge of the underlying protein interface. Thus, in this study, we report on experimental and theoretical aspects of poly-L-lysine (PLL) adsorption on transparent indium tin oxide (ITO) electrodes and the interaction between PLL and human embryonic kidney 293/GFP cells. PLL coated ITO electrodes showed a lower transfer resistance compared to bare or bovine serum albumin coated ITO electrodes. In addition, they exhibited more positive potential and higher magnitude of redox peak currents with increased immersion time of PLL solution. Finally, results of the impedance analysis showed that adhesion of cells was enhanced by PLL coating on ITO electrodes compared to bare ITO electrodes.

An in situ polymerized PEDOT/Fe3O4 composite as a Pt-free counter electrode for highly efficient dye sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1637-1643 ◽  
Author(s):  
Min Zheng ◽  
Jinghao Huo ◽  
Yongguang Tu ◽  
Jinbiao Jia ◽  
Jihuai Wu ◽  
...  
Keyword(s):  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
High Power Conversion Efficiency ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Large Active Area ◽  
Low Charge ◽  
Sensitized Solar Cells

PEDOT/Fe3O4 hybrid is in situ polymerized and used as Pt-free counter electrode in dye-sensitized solar cell. Owing to large active area and low charge transfer resistance for the hybrid, the cell achieves a high power conversion efficiency of 8.69%.

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