Abstract
In this study, a simple inexpensive gas sensor, which uses polyaniline@ZnO hollow sphere hybrid films, is prepared with different mole percentages of ZnO hollow spheres (5–30 mol%) and combining hydrothermal and in-situ chemical oxidative polymerization methods. Polyaniline@ZnO hollow sphere hybrids are loaded on flexible polyethylene terephthalate substrates for rapid and selective detection of ammonia at room temperature. The morphology, structure, chemical functional group information and the specific surface area are, respectively, characterized by field emission-scanning electron microscopy, X-ray diffraction, Fourier transform infrared and N2 adsorption–desorption techniques. The best sensing performance is realized for the polyaniline@20 mol% ZnO hollow sphere hybrid sensor, which is exposed to 10 ppm ammonia at room temperature. Moreover, this sensor exhibits a low detection limit of 500 ppb, excellent selectivity and good response/recovery times (140/136 s). This good sensing performance can be attributed to the hollow structure of ZnO and the p–n heterojunction between the polyaniline and ZnO hollow spheres.
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