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Developing flexible gas sensors based on reduced graphene oxide (rGO) are highly promising for practical application, however, it is still challenging due to the sacrificed solution-processibility and mechanical properties after reduction. To address this issue, we here introduce solution-processed rGO and designed a flexible hydrogen (H 2) film sensor by coupling with Pd nanoclusters as the activators via direct colloids mixing and subsequent vacuum filtration. The rGO/Pd nanocluster film features with structural compactness, surface homogeneity, excellent mechanical flexibility, high-efficiency output, and simplification of compositing method. In addition, the film sensor exhibited high response value, fast behavior and stable sensing behavior towards high-concentration H 2 compared with bare rGO film owing to the significant activation role of Pd nanoclusters with ultrasmall sizes (average size: 3.3 nm). Conclusively, this work provides an ingenious and effective way for the design of rGO-based flexible sensor, and shows promise for efficient portable and cost-effective monitoring of environmentally H 2 gases leaks. [ABSTRACT FROM AUTHOR]

Acetoin (also known as 3-hydroxy-2-butanone) is a metabolic biomarker gas of Listeria monocytogenes (food pathogenic bacteria). Sensitive and selective detection of acetoin biomarker can lead to indirect online monitoring of Listeria monocytogenes, which has attracted much attention in gas sensing field recent years. At present, different from the mature researches towards other VOCs biomarkers, the researches on acetoin gas sensors are newly emerged and still in the infancy. The structure of sensing materials needs to be optimized and the intrinsic sensing mechanism still needs to be further clarified. In order to promote the development of acetoin gas sensors, in this mini-review we present recent advances of acetoin gas sensors based on semiconductor metal oxides (SMOs) for the first time, expound the sensing mechanism, and put forward the research shortcomings and future prospects. [ABSTRACT FROM AUTHOR]