研究目的
To fabricate a novel room-temperature NH3 gas sensor with high sensitivity based on novel DSH ZnTiO3 microrods and study their NH3 gas-sensing properties.
研究成果
Novel DSH structures of ZnTiO3 microrods were fabricated and exhibited a strong response to low concentrations of NH3 gas at room temperature, including good sensitivity, linearity, response time, repeatability, reversibility, selectivity, and long-term stability.
研究不足
The recovery time increased with an increasing NH3 gas concentration, and the response (S) decreased with an increase in ambient humidity.
1：Experimental Design and Method Selection:
The DSH ZnTiO3 microrods were prepared using a self-templating approach by heating sol-gel derived Zn-Ti glycolates with PDDA in an EG solution and then calcining. The NH3 gas-sensing properties were studied at room temperature.
2：Sample Selection and Data Sources:
The samples were prepared by adding TE, Zn(OAc)2·2H2O, and PDDA to an EG solution, followed by calcination. The gas-sensing properties were measured using a bench system.
3：List of Experimental Equipment and Materials:
SEM, TEM, XRD, power supply (GW, PST-3202), DAQ device (NI, USB-6218), standard gas sensor system (Dr?ger, MiniWarn).
4：Experimental Procedures and Operational Workflow:
The precursor solution was drop-coated on an alumina substrate with interdigitated electrodes and calcined. The electrical and NH3 gas-sensing characteristics were measured using a bench system.
5：Data Analysis Methods:
The response (S) of the sensors was calculated based on the electrical resistances in air and testing gas.
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scanning electron microscope
JSM-5310
JEOL
Analyzing the morphology of DSH ZnTiO3 microrods films
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transmission electron microscopy
JEM-1400
JEOL
Analyzing the morphology of DSH ZnTiO3 microrods films
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X-ray diffraction
Lab XRD-6000
Shimadzu
Analyzing the composition of DSH ZnTiO3 microrods films
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power supply
PST-3202
GW
Applying a fixed 5 V to the sensor circuit
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DAQ device
USB-6218
NI
Measuring the resistance of the sensor in various concentrations of NH3 gas
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standard gas sensor system
MiniWarn
Dr?ger
Calibrating the desired various gas concentrations
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