研究目的
To investigate the photoinduced triboelectric polarity reversal and enhancement in a new metal/semiconductor triboelectric nanogenerator based on Au and TiO2, and to understand the underlying mechanisms involving surface states and photoelectrons.
研究成果
The research demonstrates that illumination induces a reversal in current polarity and significant enhancement in output for a Au/TiO2-based TENG, attributed to photoelectron accumulation on TiO2 surface states and increased conductivity. This provides a new approach for controlling TENG performance and insights into surface charge dynamics, with potential applications in energy harvesting and self-powered devices.
研究不足
The study is limited to specific materials (Au and TiO2) and may not generalize to other metal/semiconductor pairs. The device performance could be affected by environmental factors like humidity, and the enhancement mechanisms rely on surface states that might vary with material synthesis conditions. Optimization of film thickness and contact area could further improve outputs.
1：Experimental Design and Method Selection:
The study designed a triboelectric nanogenerator (TENG) using Au and TiO2 as friction layers to explore the effects of light illumination on current polarity and output. The methodology involved fabricating the device, characterizing materials, and measuring electrical outputs under dark and illuminated conditions.
2：Sample Selection and Data Sources:
FTO (Fluoride doped SnO2 on glass) substrates were used. TiO2 layers were spin-coated from a precursor solution and annealed. Ultrathin Au films were deposited by magnetic sputtering. Data were collected on short-circuit current and open-circuit voltage.
3：List of Experimental Equipment and Materials:
Equipment included a field emission scanning electron microscopy (FE-SEM; JSM-7800F), X-ray photoelectron spectroscopy (XPS; ESCALAB 250Xi), ultraviolet spectrometer (UV-2550), scanning probe microscope system (CSPM5500), dual rotating-compensator Mueller matrix ellipsometer (ME-L ellipsometer), Keithley 6514 System Electrometer, Data Acquisition Card (NI PCI-6259), linear motor (WMUA512075-06-D), and Tungsten Halogen light source (CROWNTECH, CTTH -150W). Materials included FTO glass, hydrochloric acid, 2-propanol, Titanium (IV) isopropoxide, Au for sputtering, and sponge tape.
4：Experimental Procedures and Operational Workflow:
FTO substrates were cleaned by sonication in detergent and ethanol, dried with nitrogen. TiO2 precursor was prepared and spin-coated onto FTO, then annealed at 450°C. Au films were sputtered onto glass with Ar gas at 14 W for 50 seconds. A sponge tape buffer was added, and copper wires connected to electrodes. The TENG was operated with a linear motor for periodic contact-separation at 2 Hz frequency, with light illumination from the tungsten lamp through a hole.
5：Data Analysis Methods:
Output currents and voltages were measured and analyzed for changes under dark and light conditions. XPS, UV absorbance, AFM, and ellipsometry data were used to characterize material properties. Conductivity was assessed using conductive AFM under bias voltages.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
Field Emission Scanning Electron Microscopy
JSM-7800F
JEOL
Characterizing the cross-section of the glass/FTO/TiO2 structure to measure thickness and morphology.
-
X-ray Photoelectron Spectroscopy
ESCALAB 250Xi
Thermo Fisher Scientific
Analyzing surface information of TiO2 and Au films using Al Kα radiation.
-
Ultraviolet Spectrometer
UV-2550
Shimadzu
Measuring the absorption spectrum of TiO2 films to determine optical properties.
-
System Electrometer
Keithley 6514
Keithley
Collecting data on short-circuit current and open-circuit voltage of the TENG.
-
Scanning Probe Microscope System
CSPM5500
Being Nano Instruments
Characterizing surface morphology and roughness of TiO2 and Au films.
-
Dual Rotating-Compensator Mueller Matrix Ellipsometer
ME-L ellipsometer
Measuring the thickness of Au films through ellipsometry.
-
Data Acquisition Card
NI PCI-6259
National Instruments
Acquiring and processing electrical data from the TENG device.
-
Linear Motor
WMUA512075-06-D
Controlling the contact and separation process of the TENG with periodic motion.
-
Tungsten Halogen Light Source
CTTH -150W
CROWNTECH
Illuminating the TENG device to study photoinduced effects.
-
登录查看剩余7件设备及参数对照表
查看全部
