title: Induced pH-dependent shift by local surface plasmon resonance in functionalized gold nanorods.
abstract: Localized surface plasmon resonance (LSPR) spectroscopy of metallic nanoparticles is a powerful tool for chemical and biological sensing experiments. In this study, we observed LSPR shifts of 11-mercaptoundecanoic acid modified gold nanorods (GNR-MUA) for the pH range of 6.41 to 8.88. We proposed a mechanism involving changes of the dipole moment after protonation/deprotonation carboxylic groups of 11-mercaptoundecanoic acid (MUA) which plays an important role by modulating LSPR around the functionalized GNR. Such a stable and easily prepared GNR-MUA has potential to become one of the most efficient and promising pH nanosensors to study intra- or extra-cellular pH in a wide range of chemical or biological systems.
authors: Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan. pyngyu@gate.sinica.edu.tw.
authors: Yon-Rui
authors: YR
authors: Toh
authors: Pyng
authors: P
authors: Yu
authors: Xiaoming
authors: X
authors: Wen
authors: Jau
authors: J
authors: Tang
authors: Tao-Shih
authors: TS
authors: Hsieh