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Micellar Nanoreactors Enabled Site-Selective Decoration of Pt Nanoparticles Functionalized Mesoporous SiO2 /WO3-x Composites for Improved CO Sensing.
Ma, Junhao; Xie, Wenhe; Li, Jichun; Yang, Haitao; Wu, Limin; Zou, Yidong; Deng, Yonghui.
Affiliation
  • Ma J; Department of Chemistry, Department of Gastroenterology and Hepatology, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Lab of Transducer Technology, Zhongshan Hospital, iChEM, Fudan University, Shanghai, 2
  • Xie W; Department of Chemistry, Department of Gastroenterology and Hepatology, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Lab of Transducer Technology, Zhongshan Hospital, iChEM, Fudan University, Shanghai, 2
  • Li J; Department of Chemistry, Department of Gastroenterology and Hepatology, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Lab of Transducer Technology, Zhongshan Hospital, iChEM, Fudan University, Shanghai, 2
  • Yang H; School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, P. R. China.
  • Wu L; Institute of Energy and Materials Chemistry, Inner Mongolia University, Hohhot, 010021, P. R. China.
  • Zou Y; Department of Chemistry, Department of Gastroenterology and Hepatology, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Lab of Transducer Technology, Zhongshan Hospital, iChEM, Fudan University, Shanghai, 2
  • Deng Y; Department of Chemistry, Department of Gastroenterology and Hepatology, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Lab of Transducer Technology, Zhongshan Hospital, iChEM, Fudan University, Shanghai, 2
Small ; 19(32): e2301011, 2023 Aug.
Article in En | MEDLINE | ID: mdl-37066705
Site-selective and partial decoration of supported metal nanoparticles (NPs) with transition metal oxides (e.g., FeOx ) can remarkably improve its catalytic performance and maintain the functions of the carrier. However, it is challenging to selectively deposit transition metal oxides on the metal NPs embedded in the mesopores of supporting matrix through conventional deposition method. Herein, a restricted in situ site-selective modification strategy utilizing poly(ethylene oxide)-block-polystyrene (PEO-b-PS) micellar nanoreactors is proposed to overcome such an obstacle. The PEO shell of PEO-b-PS micelles interacts with the hydrolyzed tungsten salts and silica precursors, while the hydrophobic organoplatinum complex and ferrocene are confined in the hydrophobic PS core. The thermal treatment leads to mesoporous SiO2 /WO3-x framework, and meanwhile FeOx nanolayers are in situ partially deposited on the supported Pt NPs due to the strong metal-support interaction between FeOx and Pt. The selective modification of Pt NPs with FeOx makes the Pt NPs present an electron-deficient state, which promotes the mobility of CO and activates the oxidation of CO. Therefore, mesoporous SiO2 /WO3-x -FeOx /Pt based gas sensors show a high sensitivity (31 ± 2 in 50 ppm of CO), excellent selectivity, and fast response time (3.6 s to 25 ppm) to CO gas at low operating temperature (66 °C, 74% relative humidity).
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Small Journal subject: ENGENHARIA BIOMEDICA Year: 2023 Document type: Article Country of publication: Alemania

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Small Journal subject: ENGENHARIA BIOMEDICA Year: 2023 Document type: Article Country of publication: Alemania