Abstract
Abstract Hollow spherical ZnO architectures and La-decorated ZnO materials with different amounts (0.2, 0.5, 0.8, and 1 at% La) were successfully synthesized by a simple one-step microwave-assisted synthesis method. The porous surface of the hollow sphere provided favorable conditions for gas adsorption and diffusion. The sensing performance of these gas sensing materials were systematically evaluated. The enhancement effect of La decoration on the gas sensing properties of the ZnO-based sensor to H2S was investigated. The 0.5 at% La/ZnO exhibited a high response to H2S at the operating temperature of 150 °C, and the response value was approximately 176.3 to 5 ppm H2S. The sensor based on 0.5 at% La/ZnO also has excellent selectivity to H2S at 150 °C, and the detection limit of is as low as 50 ppb, which is important for trace-level H2S detection.
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