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Determination of colloidal gold nanoparticle surface areas, concentrations, and sizes through quantitative ligand adsorption |
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| Authors: | Manuel Gadogbe Siyam M Ansar Guoliang He Willard E Collier Jose Rodriguez Dong Liu I-Wei Chu Dongmao Zhang |
| Institution: | 1. Department of Chemistry, Mississippi State University, Mississippi State, Starkville, MS, 39762, USA 4. Department of Mechanical Engineering, University of Houston, N207 Engineering Building 1, Houston, TX, 77204-4006, USA 2. Tuskegee University, Tuskegee, AL, 36088, USA 3. Mississippi State Chemical Laboratory, Mississippi State, Starkville, MS, 39762, USA 5. Department of Chemical Engineering, Mississippi State University, Mississippi State, Starkville, MS, 39762, USA |
| Abstract: | Determination of the true surface areas, concentrations, and particle sizes of gold nanoparticles (AuNPs) is a challenging issue due to the nanoparticle morphological irregularity, surface roughness, and size distributions. A ligand adsorption-based technique for determining AuNP surface areas in solution is reported. Using a water-soluble, stable, and highly UV–vis active organothiol, 2-mercaptobenzimidazole (MBI), as the probe ligand, we demonstrated that the amount of ligand adsorbed is proportional to the AuNP surface area. The equivalent spherical AuNP sizes and concentrations were determined by combining the MBI adsorption measurement with Au3+ quantification of aqua regia-digested AuNPs. The experimental results from the MBI adsorption method for a series of commercial colloidal AuNPs with nominal diameters of 10, 30, 50, and 90 nm were compared with those determined using dynamic light scattering, transmission electron microscopy, and localized surface plasmonic resonance methods. The ligand adsorption-based technique is highly reproducible and simple to implement. It only requires a UV–vis spectrophotometer for characterization of in-house-prepared AuNPs. |
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