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2026年2期
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Salicylate-Assisted Surfactant-Directed Assembly Synthesis of Uniform Mesoporous ZnO Nanospheres for Gas Sensing Applications
Salicylate-Assisted Surfactant-Directed Assembly Synthesis of Uniform Mesoporous ZnO Nanospheres for Gas Sensing Applications
摘要
Mesoporous zinc-based nanomaterials exhibit considerable potential across a spectrum of applications,yet their controlled synthesis remains challenging due to the rapid hydrolysis and condensation kinetics of Zn2+ions.Herein,we report a facile surfactant-directed synthesis strategy for the controllable synthesis of monodisperse mesoporous Zn(OH)2 nanospheres and they can be readily converted into semiconducting mesoporous ZnO(denoted mZnO)nanospheres via calcination.In this synthesis,by employing sodium salicylate(NaSal)as a multifunctional modulator,we regulate micelle organization and zinc precursor diffusion,overcoming the inherent kinetic limitations of Zn2+.The resulting crystalline mZnO can serve as an ideal host for loading ultrasmall Pt nanoclusters to produce Pt/mZnO composite nanospheres with abundant metal-metal oxide interfaces.Using Pt/mZnO nanospheres as the sensitive materials,gas sensors were fabricated on micro-electromechanical systems(MEMS)devices,which display an exceptional performance in the detection of low-concentration acetone vapor.The gas sensor exhibited high response(4.9 toward 1 ppm acetone),low detection limit(170 ppb),excellent selectivity,and good long-term stability.In situ spectroscopy characterization results reveal that,during the gas-sensing process,the reaction pathway involves catalytic oxidation of acetone over Pt/mZnO nanospheres via intermediate carboxylates.This work offers a generalized approach for designing functional mesoporous metal oxides with enhanced interfacial activity for advanced sensing and catalytic applications.
年，卷(期)：
2026, 7(2)
机标分类号：
TM623
TP311.133
TP273
在线出版日期：
2026年7月27日
