Journal article
Salt-mediated self-assembly of thioctic acid on gold nanoparticles
ACS nano, Vol.5(6), pp.4570-4580
06/28/2011
DOI: 10.1021/nn200276a
PMCID: PMC3125453
PMID: 21524135
Abstract
Self-assembled monolayer (SAM) modification is a widely used method to improve the functionality and stability of bulk and nanoscale materials. For instance, the chemical compatibility and utility of solution-phase nanoparticles are often improved using covalently bound SAMs. Herein, solution-phase gold nanoparticles are modified with thioctic acid SAMs in the presence and absence of salt. Molecular packing density on the nanoparticle surfaces is estimated using X-ray photoelectron spectroscopy and increases by ∼20% when molecular self-assembly occurs in the presence versus the absence of salt. We hypothesize that as the ionic strength of the solution increases, pinhole and collapsed-site defects in the SAM are more easily accessible as the electrostatic interaction energy between adjacent molecules decreases, thereby facilitating the subsequent assembly of additional thioctic acid molecules. Significantly, increased SAM packing densities increase the stability of functionalized gold nanoparticles by a factor of 2 relative to nanoparticles functionalized in the absence of salt. These results are expected to improve the reproducible functionalization of solution-phase nanomaterials for various applications.
Details
- Title: Subtitle
- Salt-mediated self-assembly of thioctic acid on gold nanoparticles
- Creators
- Anna A Volkert - Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United StatesVaruni SubramaniamMichael R IvanovAmanda M GoodmanAmanda J Haes
- Resource Type
- Journal article
- Publication Details
- ACS nano, Vol.5(6), pp.4570-4580
- DOI
- 10.1021/nn200276a
- PMID
- 21524135
- PMCID
- PMC3125453
- NLM abbreviation
- ACS Nano
- ISSN
- 1936-086X
- eISSN
- 1936-086X
- Publisher
- United States
- Grant note
- TL1 RR024981 / NCRR NIH HHS 1TL1RR024981 / NCRR NIH HHS UL1 RR024979-05 / NCRR NIH HHS 1KL2RR024980 / NCRR NIH HHS 1UL1RR024979 / NCRR NIH HHS UL1 RR024979 / NCRR NIH HHS KL2 RR024980 / NCRR NIH HHS
- Language
- English
- Date published
- 06/28/2011
- Academic Unit
- Chemistry
- Record Identifier
- 9983985991202771
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