Journal
ADVANCED SCIENCE
Volume 6, Issue 24, Pages -Publisher
WILEY
DOI: 10.1002/advs.201902008
Keywords
co-assembly; gas sensing; heterojunctions; hierarchical structures; mesoporous TiO2
Categories
Funding
- NSF of China [21673048, 21875044, 51822202, 51772050, 51432004]
- Shanghai Rising-Star Program [18QA1400100]
- Youth Top-notch Talent Support Program of Shanghai
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00025]
- DHU Distinguished Young Professor Program
- Fundamental Research Funds for the Central Universities [17D310602]
- Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [17JC1400100]
- Program of Shanghai Academic Research Leader [19XD1420300]
- Youth Top-notch Talent Support Program of China
- Shanghai Committee of Science and Technology, China [19520713200]
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The direct assembly of functional nanoparticles into a highly crystalline mesoporous semiconductor with oriented configurations is challenging but of significance. Herein, an evaporation induced oriented co-assembly strategy is reported to incorporate SnO2 nanocrystals (NCs) into a 3D branched mesoporous TiO2 framework by using poly(ethylene oxide)-block-polystyrene (PEO-b-PS) as the template, SnO2 NCs as the direct tin source, and titanium butoxide (TBOT) as the titania precursor. Owing to the combined properties of ultrasmall particle size (3-5 nm), excellent dispersibility and presence of abundant hydroxyl groups, SnO2 NCs can easily interact with PEO block of the template through hydrogen bonding and co-assemble with hydrolyzed TBOT to form a novel hierarchical branched mesoporous structure (SHMT). After calcination, the obtained composites exhibit a unique 3D flower-like structure, which consists of numerous mesoporous rutile TiO2 branches with uniform cylindrical mesopores (approximate to 9 nm). More importantly, the SnO2 NCs are homogeneously distributed in the mesoporous TiO2 matrix, forming numerous n-n heterojunctions. Due to the unique textual structures, the SHMT-based gas sensors show excellent gas sensing performance with fast response/recovery dynamics, high sensitivity, and selectivity toward ethanol.
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