文献类型：期刊文献

英文题名：One-step synthesis of in-situ N-doped ordered mesoporous titania for enhanced gas sensing performance

作者：Zhang, Yan[1];Yang, Qiangui[1];Yang, Xuanyu[2];Deng, Yonghui[2,3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Sch Mat Sci & Engn,Minist Educ, Shanghai 200237, Peoples R China;[2]Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, iChEM Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Mol Engn Polymers,Dept Chem, Shanghai 200433, Peoples R China;[3]Chinese Acad Sci, State Key Lab Transducer Technol, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China

年份：2018

卷号：270

起止页码：75

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20182005200200);WOS:【SCI-EXPANDED(收录号:WOS:000440529000010)】；

基金：This work was partially supported by National Natural Science Foundation of China (51372041,51422202,21673048), Shanghai Natural Science Foundation (17ZR1407100), Ministry of Education and 111 Project (B14018) and Youth Top-notch Talent Support Program of China.

语种：英文

外文关键词：N-doped; Mesoporous; Titania; Gas sensor; Acetone

摘要：In-situ N-doped ordered mesoporous titania was synthesized by a simple solvent evaporation induced aggregating assembly (EIAA) method using lab-made amphiphilic diblock copolymer polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) as a structure directing agent and titanium tetrabutoxide (TBOT) as a titanium source. The obtained N-doped mesoporous titanium dioxide materials had a pore size of similar to 6.2 mn, a large accessible surface area of 119 m(2) g(-1) and a large pore volume of 0.160 cm(3) g(-1), respectively, which facilitated the diffusion and transport of gas molecules. The as-prepared samples were characterized by the FT-IR spectra, Raman spectra, X-ray photoelectron spectroscopy and UV-vis absorption spectroscopy. The results showed that the nitrogen atoms were in situ incorporated into the lattice of TiO2, thus resulting in smaller crystallite size and more defects, which facilitated promoting gas sensing performance. Its response reached 17.6 for 250 ppm acetone, which was 11.4 times higher than that of their undoped TiO2-based sensors (1.54 for 250 ppm), and the fast response and recovery time were 4s and 4s, respectively.