Abstract
In recent years, engineered nanostructure assemblies such as nanowire arrays have attracted much research attention due to their unique chemical and functional characteristics collectively. The engineered nano-assemblies usually carry the characteristics distinct from bulk as a result of a size effect in their comprised elemental building blocks. The nanoscale size induced high surface-to-volume ratio is a fundamental attribute responsible for various chemical and physical properties required in various technologically important applications such as catalysts and sensors. This review article surveys the latest progress in engineered metal oxide nanostructure arrays, i.e., nanoarrays, for advanced chemical sensors’ design and application. It starts with an overview of gaseous chemical sensors followed by surveys of various fabrication methods and routes for metal oxide nanoarrays. Different sensing modes and corresponding applications have been highlighted in the mixed gaseous chemical sensing, which provides new approaches and perspectives to meet the challenges of selective gas sensing, such as the cross-sensitivity and inter-correlation of multiple sensing signals.
Highlights
Ultrahigh surface area, low cost, and unique properties are the major merits for various ceramic based nanomaterials such as metal oxide thin films and nanoparticles
We have surveyed the latest progress on the development of the metal oxide based nanoarrays and their applications as sensing devices for various gaseous chemicals
The template-free syntheses have witnessed some fast growth of a selective group of metal oxide nanoarrays suitable for chemical sensing, such as ZnO, Ga2O3, TiO2, and In2O3, with their growth controlled by adjusting synthetic parameters such as the operating temperature and precursor concentration
Summary
Low cost, and unique properties are the major merits for various ceramic based nanomaterials such as metal oxide thin films and nanoparticles. In the past couple of decades, various nanoarrays based sensing materials have been studied, including carbon nanotubes (CNTs) (Li et al, 2003; Sotiropoulou and Chaniotakis, 2003; Star et al, 2006; Yang et al, 2010), metal oxide nanowire arrays [e.g., ZnO (Wang et al, 2006), TiO2 (Lu et al, 2008), CuO (Liao et al, 2009), MnO2 (Wang et al, 2018), Ga2O3 (Lin et al, 2016), and Fe2O3 (Xiong et al, 2013)], silicon nanoarrays (Kwon et al, 2018) III-V or II-VI based hetero-nanoarrays (Zhang et al, 2002), as well as the hybrid nanoarrays using multiple structures (Zang et al, 2014) These nanoarray sensing materials can promote sensing performance dramatically, the reviews exclusively on the nanoarray based chemical sensors are still limited, especially on the multi-component sensings, and corresponding sensing mechanisms. The latest development and future directions are summarized in metal oxide nanoarray based chemical sensors
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