Choi, Myung Sik Ahn, Jihye Kim, Min Young Mirzaei, Ali Choi, Soon-Mok Chun, Dong Won Jin, Changhyun Lee, Kyu Hyoung 2024-01-19T13:31:05Z 2024-01-19T13:31:05Z 2021-10-21 2021-11-01 0169-4332 https://pubs.kist.re.kr/handle/201004/116155 Pristine and Al-doped SnO2 nanoparticles with different amounts of Al dopant were synthesized using a conventional hydrothermal process. The existing SnO2 exhibited simple interstitial physical bonding (SnO2-Al (1:0.16)) with the Al dopant; however, with an increase in the Al concentration, the bonding changed to substitutional chemical bonding (SnO2-Al (1:0.33)). We found that this crystal structural change is strongly interrelated with surface reactivity; the optimized Al-doped SnO2 nanoparticles-based sensor exhibited a significantly improved response of 17.38 - 20 ppm H2S gas with a response time of 35 s. The enhanced gas response was related to the high surface area of the optimal gas sensor (BET surface area = 78.087 m3/g) as well as the beneficial effects of Al doping. It is highlighted that this simple technique of engineering the bonding characteristics can be widely applied to other semiconducting metal oxides. English ELSEVIER DOPED ZNO SENSOR TEMPERATURE SHELL TIO2 Changes in the crystal structure of SnO2 nanoparticles and improved H2S gas-sensing characteristics by Al doping Article 10.1016/j.apsusc.2021.150493 1 APPLIED SURFACE SCIENCE, v.565 APPLIED SURFACE SCIENCE 565 scie scopus 000681144100003 2-s2.0-85108944316 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article DOPED ZNO SENSOR TEMPERATURE SHELL TIO2 Al-dopedSnO2 H2S gas Gas sensor Surface reactivity Bonding characteristics