Zhang L et al. (2018), A novel composite of CdS nanorods growing on a ...

ECB-ART-50729

RSC Adv 2018 Sep 04;854:30747-30754. doi: 10.1039/c8ra05082a.

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A novel composite of CdS nanorods growing on a polyaniline-Cd2+ particles surface with excellent formaldehyde gas sensing properties at low temperature.

Zhang L , Li X , Mu Z , Miao J , Wang K , Zhang R , Chen S .

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A novel composite, CdS nanorods growing on a polyaniline-Cd2+ particles surface (CdS/PANI) with a hexagonal wurtzite structure phase, was prepared using a hydrothermal synthesis method. Methods of XRD, SEM, and FTIR were used to analyze the structure and morphology of the compounds. SEM shows that CdS/PANI consists of sea urchin-like nanorods of about 200-500 nm in length and about 50 nm in diameter. Furthermore, the FTIR spectra show that some characteristic peaks of CdS/PANI are much weaker than those of PANI and the corresponding peaks shift to a higher wavenumber. In addition, the IR stretching frequency of the Cd-S bond for CdS/PANI moved from 630 cm-1 to 674 cm-1. In the gas sensing experiments, the CdS/PANI-based sensor showed an excellent response to low concentration formaldehyde gas in a wide temperature range of 80-140 °C. The highest response of CdS/PANI could reach about 4.8 to 5 ppm formaldehyde gas at 120 °C. The response and recovery times of the sensor based on CdS/PANI were about 25 s and 30 s to 10 ppm formaldehyde gas, respectively.

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References [+] :

Li, One-dimensional CdS nanostructures: a promising candidate for optoelectronics. 2013, Pubmed

	Fig. 1. Photograph of a blank gas sensor.
	Fig. 2. The XRD patterns of PANI (a), CdS (b) and CdS/PANI (c) samples.
	Fig. 3. The surface micrographs of PANI (a), CdS (b) and CdS/PANI (c and d).
	Fig. 4. The FTIR spectra of PANI (a), CdS (b) and PANI/CdS (c) samples.
	Fig. 5. Schematic diagram of coordination bond between Cd2+ and amino of PANI.
	Fig. 6. Resistance–temperature relationships of the sensors from different samples in air and in 500 ppm HCHO gas.
	Fig. 7. Response to 500 ppm HCHO gas of PANI, CdS and CdS/PANI sample-based sensors at different temperatures.
	Fig. 8. Schematic representation of gas sensing mechanism for PANI and CdS/PANI.
	Fig. 9. Relationship between HCHO gas concentration and the response of sensors of PANI, CdS and CdS/PANI nanorods sample-based at their respective optimum working temperature.
	Fig. 10. The survey of the response and recovery behavior for the CdS/PANI nanorods-based sensor to 10 ppm at 120 °C.
	Fig. 11. Resistance stability of CdS/PANI nanorods-based sensor.