研究目的
Investigating the novel nanoporous structure of aluminium phthalocyanine chloride (AlPcCl) prepared by template-assisted method for a humidity sensor.
研究成果
The humidity sensor prepared from 10 mg/ml at 1000 rpm exhibits a greater sensitivity and relatively low hysteresis at 1 kHz. The nanopores active layer has extended humidity sensitivity over the entire humidity range as compared to thin film. The combination of AAO template and spin coating method can be a potent approach for achieving nanoporous structure for humidity sensors.
研究不足
The sensitivity of the sensor is influenced by the concentration of the solution and the spin rate, which may limit the reproducibility of the sensor's performance. The operational frequency also affects the sensor's sensitivity and hysteresis.
1：Experimental Design and Method Selection:
The nanoporous sensing layer was fabricated by solution wetting of anodic aluminium oxide template. The solutions of AlPcCl in different concentrations were spun cast over the template at various speeds.
2：Sample Selection and Data Sources:
Aluminum 1,8,15,22-tetrakis 29H,31H phthalocyanine chloride (AlPcCl) and chloroform (CHCl3) were used. Two different solutions were prepared by dissolving 5 and 10 mg of AlPcCl powder, separately, in 1 ml chloroform.
3：List of Experimental Equipment and Materials:
AAO template (Whatman Anodisc) with nominal pore-diameter of 20 nm and a thickness of 60 μm, GW Instek LCR-829 meter, humidity meter, Rossmax NB80 humidifier, nitrogen gas, MS5308 LCR meter, RS-6109 humidity meter.
4：Experimental Procedures and Operational Workflow:
The solutions were stirred for 1 h at room temperature to obtain a homogenous solution. The nanoporous structures from both solutions were prepared using an AAO template by the method described elsewhere. The nanostructures prepared with a solution of higher concentration are longer, denser and well aligned. With very high spin rate the pores tend to fuse and amalgamate.
5：Data Analysis Methods:
The capacitance and resistance of the fabricated sensor were measured by MS5308 LCR meter at different humidity levels. The influence of humidity levels on the capacitance of the device were measured using LCR meter. The measurements were taken at 100 Hz, 1 kHz and 10 kHz to study their frequency-dependent response at AC applied-voltage.
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