Analytical Characterization of Size-Dependent Properties of Larger Aqueous Gold Nanoclusters

作者：Plascencia Villa German; Demeler Borries; Whetten Robert L; Griffith Wendell P; Alvarez Marcos; Black David M; Jose Yacaman Miguel

来源：Journal of Physical Chemistry C, 2016, 120(16): 8950-8958.

DOI：10.1021/acs.jpcc.6b00448

Gold nanoclusters (AuNCs) with well-defined structure and arrangement possess particular physical and functional properties. AuNCs that differ only by less than 1 nm in diameter corresponding to one atomic layer show different structural, optical, and physicochemical properties in a size dependent mode, making their analytical characterization a challenge. Herein we describe an integrative approach to characterization of larger aqueous AuNC (Au-102-pMBA(44), Au(144)pMBA(60) and higher) selected by gel electrophoresis (PAGE). We employ UV-vis, dynamic light scattering, and zeta-potential in combination with high-performance analytical techniques such as multiwavelength analytical ultracentrifugation and electrospray ionization mass spectrometry were used to separate aqueous AuNCs hydrodynamic diameter, partial abundance, molecular weight, and mass/charge ratios when present in a complex mixture of AuNCs containing Au-102 (1.6 nm), A(144) (2 nm), and AU(288-328) (2.5 nm). Advanced analytical electron microscopy imaging (spherical aberration corrected BF/HAADF-STEM at low voltages dose) also revealed the structures of discrete arrangements of gold nanocluster populations.

• 出版日期2016-4-28