Construction of mesoporous silica-implanted tungsten oxides for selective acetone gas sensing  

作　　者：Jichun Li Zhengren Wang Yu Deng Hongxiu Yu Yonghui Deng Xiaowei Cheng Kaiping Yuan 

机构地区：[1]Department of Chemistry,Shanghai Stomatological Hospital&School of Stomatology,State Key Laboratory of Molecular Engineering of Polymers,Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,iCHEM,Fudan University,Shanghai 200433,China [2]Frontier Institute of Chip and System,State Key Laboratory of ASIC and System,Fudan University,Shanghai 200433,China [3]State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences,Shanghai 200050,China

出　　处：《Chinese Chemical Letters》2024年第11期492-498,共7页中国化学快报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(Nos.62104045,22125501,U22A20152);State Key Laboratory of Transducer Technology of China(No.SKT2207);Medical Engineering Jiont Fund of Fudan University(No.yg2023-10);Fundamental Research Funds for the Central Universities(No.20720220010)。

摘　　要：As a key biomarker for noninvasive diagnosis of diabetes,the selective detection of trace acetone in exhaled gas using a portable and low-cost device remains a great challenge.Semiconductor metal oxide(SMO)based gas sensors have drawn signification attention due to their potential in miniaturization,user-friendliness,high cost-effectiveness and selective real-time detection for noninvasive clinical diagnosis.Herein,we propose a one-pot solvent evaporation induced tricomponent co-assembly strategy to design a novel ordered mesoporous SMO of silica-implanted WO_(3)(Si O_(2)/WO_(3))as sensing materials for trace acetone detection.The controlled co-assembly of silicon and tungsten precursors and amphiphilic diblock copolymer poly(ethylene oxide)-block-polystyrene(PEO-b-PS),and the subsequent thermal treatment enable the local lattice disorder of WO_(3)induced by the amorphous silica and the formation of ordered mesoporous Si O_(2)/WO_(3)hybrid walls with a unique metastableε-phase WO_(3)framework.The obtained mesoporous SiO_(2)/WO_(3)composites possess highly crystalline framework with large uniform pore size(12.0-13.3 nm),high surface area(99-113 m^(2)/g)and pore volume(0.17-0.23 cm^(3)/g).Typically,the asfabricated gas sensor based on mesoporous 2.5%Si O_(2)/WO_(3)exhibits rapid response/recovery rate(5/17 s),superior sensitivity(R_(air)/R_(gas)=105 for 50 ppm acetone),as well as high selectivity towards acetone.The limit of detection is as low as 0.25 ppm,which is considerably lower than the thresh value of acetone concentration(>1.1 ppm)in the exhaled breath of diabetic patients,demonstrating its great prospect in real-time monitoring in diabetes diagnosis.Moreover,the mesoporous 2.5%Si O_(2)/WO_(3)sensor is integrated into a wireless sensing module connected to a smart phone,providing a convenient real-time detection of acetone.

关 键 词：Mesoporous materials ε-Tungsten oxide Silica-implanted Acetone sensing Real-time detection 

分 类 号：TQ224.223[化学工程—有机化工] TP212[自动化与计算机技术—检测技术与自动化装置]