Supplementary Material for Journal of Sol-Gel Science and Technology Towards ultrafine TiO2 nanocrystal at room temperature Xianfeng Du, Kai Men, Youlong Xu, Bing Li, Mingqi Gao, Zihan Liu, Shengchun Mao, Wasif ur Rehman Electronic Materials Research Laboratory, Key laboratory of the Ministry of Education & International Center of Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, PR China Experimental Section Thermo-gravimetric analysis of TiO2 xerogel was carried out by thermal analyzer (TGA/DSC1, Mettler-Toledo) under a flow of air with a temperature ramp of 10 °C•min-1. 100 TG (%) 95 90 85 80 0 100 200 300 400 500 600 700 800 o Temperature ( C) Fig. S1 Thermo-gravimetric curves of TiO2 xerogel. * Corresponding author, Email: ylxu@mail.xjtu.edu.cn; Tel: +86 29 82665161. Fax: +86 29 82660010