title: Nanosecond Time-Resolution Study of Gold Nanorod Rotation at the Liquid-Solid Interface.
abstract: Early studies showed that the adsorption of nanorods may start from a special "anchored" state, in which the nanorods lose translational motion but retain rotational freedom. Insight into how the anchored nanorods rotate should provide additional dimensions for understanding particle-surface interactions. Based on conventional time-resolution studies, gold nanorods are thought to continuously rotate following initial interactions with negatively charged glass surfaces. However, this nanosecond time-resolution study reveals that the apparent continuous rotation actually consists of numerous fast, intermittent rotations or transitions between a small number of weakly immobilized states, with the particle resting in the immobilized states most of the time. The actual rotation from one immobilized state to the other happens on a 1 ms timescale, that is, approximately 50 times slower than in the bulk solution.
authors.affiliation: Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27599-7115, USA.|Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA.|Kathmandu Institute of Applied Sciences, Kathmandu, Nepal.
authors.forename: Bhanu
authors.initials: B
authors.lastname: Neupane
authors.affiliation: Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA.
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
authors.affiliation: Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Department of Chemistry, Georgia State University, Atlanta, GA, 30303, USA. nfang@gsu.edu.
authors.forename: Ning
authors.initials: N
authors.lastname: Fang
authors.affiliation: Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27599-7115, USA. fsligler@ncsu.edu.
authors.forename: Frances S
authors.initials: FS
authors.lastname: Ligler
authors.affiliation: Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA. gufeng_wang@ncsu.edu.
authors.forename: Gufeng
authors.identifier: http://orcid.org/0000-0001-5068-4883
authors.initials: G
authors.lastname: Wang
keywords: adsorption; fluctuation correlation spectroscopy; gold nanorods; rotation; surface plasmon resonance