研究目的
To develop a room temperature resistive NO2 sensor with enhanced performance using a gold-loaded organic-inorganic hybrid perovskite incorporating tin dioxide, and to study its sensing mechanism under UV illumination.
研究成果
The Au/MASnI3/SnO2 nanocomposite exhibits excellent NO2 sensing performance at room temperature under UV illumination, with high response, fast recovery, good selectivity, low detection limit, and linear response. This is attributed to the synergistic effects of light absorption, p-n heterojunction, and catalytic gold nanoparticles. The sensor is suitable for applications in environmental monitoring, with recommendations for further optimization in humidity resistance and long-term stability.
研究不足
The sensor's performance decreases at high relative humidity, and the calcination process may lead to incomplete oxidation or sublimation of components, affecting material stability and composition control.
1：Experimental Design and Method Selection:
The study involved synthesizing Au/MASnI3/SnO2 nanocomposites by calcination at various temperatures to optimize the p-n heterojunction structure for gas sensing. Methods included XRD, FESEM, HRTEM, PL spectra, BET, FTIR, and gas response measurements.
2：Sample Selection and Data Sources:
Samples were prepared by calcining MASnI3 and MASnI3/Au at temperatures from 190°C to 600°C. Gas sensing data were obtained using a standard WS-30A gas sensing measurement system with controlled NO2 concentrations.
3：List of Experimental Equipment and Materials:
Equipment included a DX-2700 diffractometer, JSM-6700F FESEM, JEM-2010F HRTEM, Hitachi RF-5301PC fluorescence spectrometer, 3H-2000III surface area analyzer, Nicolet IS10 FTIR, WS-30A gas sensing system, and a 300 W Xe lamp with a 365 nm filter. Materials included MASnI3, SnO2, gold nanoparticles, terpineol, and standard NO2 gas.
4：Experimental Procedures and Operational Workflow:
Synthesis involved calcining precursors at specified temperatures. Characterization was performed using the listed equipment. Gas sensing tests were conducted at room temperature with and without UV illumination, measuring resistance changes in response to NO
5：Data Analysis Methods:
Response was calculated as Rg/Ra for oxidizing gases. Data were analyzed for sensitivity, detection limit, and linear range using statistical methods and fitting curves.
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-6700F
JEOL
Used to observe the morphology of samples.
-
High-resolution transmission electron microscope
JEM-2010F
JEOL
Used for detailed structural and compositional analysis via HRTEM imaging.
-
Fluorescence spectrometer
RF-5301PC
Hitachi
Used to obtain photoluminescence spectra of samples.
-
Fourier transform infrared spectrometer
Nicolet IS10
Thermo Fisher Scientific
Used to obtain FTIR spectra of samples.
-
X-ray diffractometer
DX-2700
Haoyuan
Used for measuring XRD patterns of samples to analyze crystal structure and composition.
-
Surface area analyzer
3H-2000III
Beishide Instrument Technology
Used to estimate specific surface area via BET equation based on nitrogen adsorption isotherm.
-
Gas sensing measurement system
WS-30A
Zhengzhou Winsen Electron. Technol. Co. Ltd.
Used for measuring gas response properties of sensors.
-
Xe lamp
300 W with band pass filter
Used as UV light source for illumination during gas sensing experiments.
-
登录查看剩余6件设备及参数对照表
查看全部
