scholarly journals Semiconductor quantum dot-sensitized rainbow photocathode for effective photoelectrochemical hydrogen generation

2017 ◽  
Vol 114 (43) ◽  
pp. 11297-11302 ◽  
Author(s):  
Hongjin Lv ◽  
Congcong Wang ◽  
Guocan Li ◽  
Rebeckah Burke ◽  
Todd D. Krauss ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Present Report ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Faradaic Efficiency ◽  
Coating Method

The present study reports the fabrication of CdSe quantum dot (QD)-sensitized photocathodes on NiO-coated indium tin oxide (ITO) electrodes and their H2-generating ability upon light irradiation. A well-established spin-coating method was used to deposit CdSe QD stock solution onto the surface of NiO/ITO electrodes, thereby leading to the construction of various CdSe QD-sensitized photocathodes. The present report includes the construction of rainbow photocathodes by spin-coating different-sized QDs in a sequentially layered manner, thereby creating an energetically favorable gradient for charge separation. The resulting rainbow photocathodes with forward energetic gradient for charge separation and subsequent electron transfer to a solution-based hydrogen-evolving catalyst (HEC) exhibit good light-harvesting ability and enhanced photoresponses compared with the reverse rainbow photocathodes under white LED light illumination. Under minimally optimized conditions, a photocurrent density of as high as 115 μA⋅cm−2 and a Faradaic efficiency of 99.5% are achieved, which is among the most effective QD-based photocathode water-splitting systems.

scholarly journals Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 817
Author(s):  
Sitansu Sekhar Nanda ◽  
Minjik Kim ◽  
Sung Jong Yoo ◽  
Georgia C. Papaefthymiou ◽  
Dong Kee Yi
Keyword(s):  
Quantum Dots ◽  
Cyclic Voltammetry ◽  
Quantum Dot ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Indium Tin Oxide Electrode ◽  
Photo Sensor ◽  
Cadmium Selenium

Monolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-sensor via an electrochemical cell mechanism; it was possible to tune current densities under light illumination. Electrochemical tests on a quantum dot capacitor, using different sized (red, yellow and green) cadmium-selenium quantum dots on indium tin oxide substrates, showed typical capacitive behavior of cyclic voltammetry curves in 2M H2SO4 aqueous solutions. This arrangement provides a beneficial effect in, both, charge separation and light sensory characteristics. Importantly, the photocurrent density depended on quantum yield rendering tunable photo-sensing properties.

scholarly journals The Spectrum of Quantum Dots Film for UV CCD

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Lin Jiang ◽  
Haojie Sun ◽  
Bang-lian Xu ◽  
Da-wei Zhang ◽  
Chun-xian Tao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Composite Coating ◽  
Spin Coating ◽  
Fused Silica ◽  
Image Sensors ◽  
Fluorescent Properties ◽  
Excellent Performance ◽  
Coating Method ◽  
Silicon Based

A new kind of UV-responsive film with quantum dots (QDs) fabricated by a spin-coating method is proposed in this paper. In a previous study, the monolayer QDs film is deposited onto fused silica slides by the spin-coating way, which has some luminous problem. The introduction of composite QDs coating which adds PEDOT:PSS and poly-TPD films to the monolayer QDs film is found to have excellent performance. The reason can be that PEDOT:PSS and poly-TPD weaken the scattering and enhance the emitting of quantum dot fluorescence. The intensity of photoluminescence (PL) for composite QDs coating is dozens of times stronger than that for monolayer QDs film. Experiment results show that this composite coating has excellent fluorescent properties and emits a blue purple glow together a wide excitation spectrum field from 190 nm to 300 nm. The spectrum of the composite coating matches accurately with the detected zone of CCD, which achieves an outstanding UV-responsive coating for conventional silicon-based image sensors.

Tungsten Oxide (WO3) Films Prepared by Sol-Gel Spin-Coating Technique

2018 ◽  
Vol 280 ◽  
pp. 71-75 ◽  
Author(s):  
B. Wen Cheun Au ◽  
Kah Yoong Chan ◽  
Wai Leong Pang ◽  
Chu Liang Lee ◽  
Abd Hamid Mustafa
Keyword(s):  
Film Thickness ◽  
Tungsten Oxide ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Visible Range ◽  
Smart Windows ◽  
Wide Range ◽  
Coating Method

Tungsten oxide (WO3) is a transition metal oxide with a wide range of applications such as displays, rear-view mirrors, electrochromic (EC) smart windows and gas sensors. Many techniques were adopted for the fabrication of WO3, namely magnetron sputtering, spray pyrolysis and sol-gel synthesis techniques. In this work, WO3films were deposited on indium tin oxide (ITO) coated glasses by sol-gel spin-coating method. The film thickness was varied by depositing different number of layers. The WO3film thickness and optical transmittance were determined using step profilometer and ultraviolet-visible (UV-Vis) spectrophotometer, respectively. WO3film thicknesses increased from 38 nm to 606 nmwith increasing number of deposited layers.The optical transmittance of the WO3films in visible range decreased with increasing film thickness. The optical transmittance were at least 70 % up to 10 deposited layers.WO3is a promising EC material in the application ofEC devices (ECDs).The application of WO3in the EC devices will be discussed.

Preparation of N-Doped TiO2/NiO Composite Electrode and its Photoelectrochemcal Characteristics

2011 ◽  
Vol 306-307 ◽  
pp. 344-347
Author(s):  
Chun Tao Wang ◽  
Wen Kui Zhang ◽  
Hui Huang ◽  
Xin Yong Tao
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Composite Electrode ◽  
Sol Gel ◽  
Photoelectrochemical Properties ◽  
Visible Transmittance ◽  
Coating Method ◽  
Uv Visible ◽  
Transient Measurements

TiO2-xNx film was prepared by the combination of sol-gel and spin-coating method on indium-tin oxide (ITO) conducting glass substrate. Then an ITO/TiO2-xNx/NiO composite electrode was obtained by chemical bath deposition (CBD). The morphology, crystal structure and composition of the ITO/TiO2-xNx film were characterized by SEM, XRD, and XPS. The photoelectrochemical properties of the ITO/TiO2-xNx/NiO electrode were evaluated by photocurrent transient measurements and UV-visible transmittance spectra. The results showed that the ITO/TiO2-xNx/NiO electrode was sensitive to light and exhibited a noticeable photoelectrochromism.

A colloidal heterostructured quantum dot sensitized carbon nanotube–TiO2 hybrid photoanode for high efficiency hydrogen generation

2019 ◽  
Vol 4 (2) ◽  
pp. 404-414 ◽  
Author(s):  
Gurpreet Singh Selopal ◽  
Mahyar Mohammadnezhad ◽  
Fabiola Navarro-Pardo ◽  
François Vidal ◽  
Haiguang Zhao ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Quantum Dot ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Photocurrent Density ◽  
Control Device

A photoelectrochemical device based on a TiO2/QD–MWCNT (0.015 wt%) hybrid photoanode yields 40% higher photocurrent density than the control device.

scholarly journals FABRICATION OF NON REFLECTING FILM BASED ON POLYSTYRENE AND METHYL METHACRYLATE USING SPIN COATING TO INCREASE A LIGHT TRANSMISSION ON ITO GLASS

2020 ◽  
Vol 82 (2) ◽  
Author(s):  
Sudarsono Sudarsono ◽  
Gatut Yudoyono ◽  
Diky Anggoro ◽  
Hasto Sunarno ◽  
Yono Hadi Pramono
Keyword(s):  
Methyl Methacrylate ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Optical Waveguides ◽  
Light Transmission ◽  
Wavelength Region ◽  
Spin Coating Method ◽  
Ito Glass ◽  
Coating Method ◽  
Good For

Thin films are developed for multi-purposes, such as optical waveguides, corrosion resistant coating, car tinting, and glass coatings. Each thin film is created and designed with a specific purpose and function. The purpose of this research was to fabrication anti-reflective films on glass Indium Tin Oxide (ITO) usually used as an electrode in Dye-sensitized Solar Cell (DSSC). In this research, the material used involved solution 100.12 g/mol Methyl Methacrylate (MMA) and 3% Polystyrene(PS) with a spin coating method. In this study, polystyrene and methyl methacrylate solution dripped on ITO glass was then rotated at 1000, 1500, 2000 and 2500 rpm. This study shows that polystyrene and methyl methacrylate materials can be used as an anti-reflection coating on the ITO substrate by a spin coating method. The methyl methacrylate material is good for anti-reflection coating at 400-475 nm wavelength region, while the polystyrene material is good for 475-700 nm wavelength. The addition of a 3% polystyrene coating on ITO glass can increase light transmission at a wavelength of 475-700 nm by 1.14% when compared to ITO glass without a polystyrene coating. The highest light transmission of 90.11% occurs at a wavelength of 420 nm when the ITO glass is coated with methyl methacrylate.

Effects of Annealing Temperature of Indium Tin Oxide Thin Films Prepared onto Glass by Sol-Gel Spin Coating Method

2011 ◽  
Vol 343-344 ◽  
pp. 116-123
Author(s):  
Yu Ming Peng ◽  
Yan Kuin Su ◽  
Cheng Jye Chu ◽  
Ru Yuan Yang ◽  
Ruei Ming Huang
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Optical And Electrical Properties ◽  
Coating Method ◽  
Ito Thin Films

In this paper, the indium tin oxide (ITO) thin films were prepared by a sol-gel spin coating method and then annealed under different temperatures (400, 500 and 550°C) in a mixture atmosphere of 3.75% H2 with 96.25% N2 gases. The microstructure, optical and electrical properties of the prepared films were investigated and discussed. The XRD patterns of the ITO thin films indicated the main peak of the (222) plane and showed a high degree of crystallinity with an increase of the annealing temperature. In addition, due to the pores existing in the prepared films, the optical and electrical properties of the prepared films are degraded through the sol-gel process. Thus, the best transmittance of 70.0 %in the visible wavelength region and the lowest resistivity of about 1.1×10-2 Ω-cm were obtained when the prepared film was annealed at 550°C.

Carbon Quantum Dot/TiO2 Nanohybrids: Efficient Photocatalysts for Hydrogen Generation via Intimate Contact and Efficient Charge Separation

2019 ◽  
Vol 2 (2) ◽  
pp. 1027-1032 ◽  
Author(s):  
Yulu Zhou ◽  
Sizhuo Yang ◽  
Donghua Fan ◽  
Jake Reilly ◽  
Hongwei Zhang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Intimate Contact ◽  
Carbon Quantum Dot ◽  
Efficient Charge
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