title: Enhancement of Paramagnetic Relaxation by Photoexcited Gold Nanorods.
abstract: Electron spin resonance (ESR) spectroscopy was used to investigate the switchable, light-dependent effects of gold nanorods (GNRs) on paramagnetic properties of nitroxide spin probes. The photoexcited GNRs enhanced the spin-spin and spin-lattice relaxations of nitroxide spin probes. It was shown that molecular oxygen plays the key role in this process. Our results demonstrate that ESR is a powerful tool for investigating the events following photoexcitation of GNRs. The novel light-controlled effects observed for GNRs on paramagnetic properties and activities of surrounding molecules have a number of significant applications where oxygen sensing and oxygen activity is important.
authors.affiliation: Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park 20740, MD, USA.|CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.|Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences &Peking Union Medical College, Beijing 100005, P. R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wen
authors.affiliation: Division of Bioanalytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park 20740 MD, USA.
authors.forename: Wayne G
authors.initials: WG
authors.lastname: Wamer
authors.affiliation: Department of Biophysics, Medical College of Wisconsin, Milwaukee 53226 WI, USA.
authors.forename: Witold K
authors.initials: WK
authors.lastname: Subczynski
authors.affiliation: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Hou
authors.affiliation: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Wu
authors.affiliation: Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park 20740, MD, USA.
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Yin
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D006046:Gold / Q000737:chemistry; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects; D010100:Oxygen / Q000737:chemistry
chemical_list: D006046:Gold; D010100:Oxygen