Gao, Daming, et al. “Ultrasensitive Detection of 2,4-D at Surface of a Hybrid Silica Nanoparticle Based on Photoinduced-Electron Transfer Enhanced Fluorescence”. Asian Journal of Chemistry, vol. 24, no. 9, May 2012, pp. 4031-4, https://asianpubs.org/index.php/ajchem/article/view/9535.