title: Assessing the Role of Capping Molecules in Controlling Aggregative Growth of Gold Nanoparticles in Heated Solution.
abstract: This report describes findings of an investigation of the role of capping molecules in the size growth in the aggregative growth of pre-formed small-sized gold nanoparticles capped with alkanethiolate monolayers toward monodispersed larger sizes. The size controllability depends on the thiolate chain length and concentration in the thermal solution. The size evolution in solution at different concentrations of alkanethiols is analyzed in relation to adsorption isotherms and cohesive energy. The size dependence on thiolate chain length is also analyzed by considering the cohesive energy of the capping molecules, revealing the importance of cohesive energy in the capping structure. Theoretical and experimental comparisons of the surface plasmonic resonance optical properties have also provided new insights into the mechanism, thus enabling the exploitation of size-dependent nanoscale properties.
authors.affiliation: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, China. hwcheng@sit.edu.cn.|Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA. hwcheng@sit.edu.cn.
authors.forename: Han-Wen
authors.initials: HW
authors.lastname: Cheng
authors.affiliation: Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA.|i3 Electronics, Inc., Endicott, New York, 13760, USA.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Schadt
authors.affiliation: Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, 13902, USA. cjzhong@binghamton.edu.
authors.forename: Chuan-Jian
authors.initials: CJ
authors.lastname: Zhong
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006358:Hot Temperature; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012996:Solutions; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000473:Alkanes; D012996:Solutions; D013438:Sulfhydryl Compounds; D006046:Gold
keywords: adsorption isotherm; aggregative growth; alkanethiols; capping molecules; cohesive energy; gold nanoparticles