期刊
SMALL
卷 16, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202004772
关键词
gas sensors; mesoporous materials; noble metal nanoparticles; semiconducting metal oxides
类别
资金
- NSF of China [21673048, 21875044]
- National Key R&D Program of China [2018YFA0209401]
- Science and Technology Commission of Shanghai Municipality [20JC1415300]
- Program of Shanghai Academic Research Leader [19XD1420300]
- State Key Laboratory of Transducer Technology of China [SKT1904]
- National Youth Top-notch Talent Support Program of China
- King Saud University, Riyadh, Saudi Arabia [RSP 2020/155]
Semiconducting metal oxides-based gas sensors with the capability to detect trace gases at low operating temperatures are highly desired in applications such as wearable devices, trace pollutant detection, and exhaled breath analysis, but it still remains a great challenge to realize this goal. Herein, a multi-component co-assembly method in combination with pore engineering strategy is proposed. By using bi-functional (3-mercaptopropyl) trimethoxysilane (MPTMS) that can co-hydrolyze with transition metal salt and meanwhile coordinate with gold precursor during their co-assembly with PEO-b-PS copolymers, ordered mesoporous SiO2-WO3 composites with highly dispersed Au nanoparticles of 5 nm (mesoporous SiO2-WO3/Au) are straightforward synthesized. This multi-component co-assembly process avoids the aggregation of Au nanoparticles and pore blocking in conventional post-loading method. Furthermore, through controlled etching treatment, a small portion of silica can be removed from the pore wall, resulting in mesoporous SiO2-WO3/Au with increased specific surface area (129 m(2) g(-1)), significantly improved pore connectivity, and enlarged pore window (4.3 nm). Thanks to the presence of well-confined Au nanoparticles and epsilon-WO3, the mesoporous SiO2-WO3/Au based gas sensors exhibit excellent sensing performance toward ethanol with high sensitivity (R-a/R-g = 2-14 to 50-250 ppb) at low operating temperature (150 degrees C).
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