Substituent Effects Impact Surface Charge and Aggregation of Thiophenol-Labeled Gold Nanoparticles for SERS Biosensors oleh Nolan File, Joseph Carmicheal, Alexey V. Krasnoslobodtsev, Nicole C. Japp, Joshua J. Souchek, Sudesna Chakravarty, Michael A. Hollingsworth, Aaron A. Sasson, Gopalakrishnan Natarajan, Prakash G. Kshirsagar, Maneesh Jain, Chihiro Hayashi, Wade M. Junker, Sukhwinder Kaur, Surinder K. Batra