title: The effects of the π-π stacking interactions on the patterns of gold nanoparticles formed at the air-water interface.
abstract: Benzyl-n-hexadecyl dimethylammonium chloride (BHDC) monolayer-stabilized gold nanoparticles were synthesized in a two-phase liquid-liquid system and found to self-assemble into varied structures under the control of temperature at the air-water interface. It has been demonstrated that the π-π stacking interactions between the capping agent molecules significantly affect the formation of the unique patterns. A possible mechanism based on Marangoni-Bénard convection in the evaporating droplets and π-π stacking interactions was proposed. Four surfactants with similar structures: N-hexadecyl-N-methylpyrrolidinium bromide (C(16)MPB), 1-hexadecyl-3-methylimidazolium bromide (C(16)mimBr), 1-(2,4,6-trimethylphenyl)-3-hexadecylimidazolium bromide (C(16)pimBr) and hexadecyltrimethylammonium bromide (CTAB) were also used to further verify the formation mechanism mentioned above.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, P. R. China.
authors.forename: Han
authors.initials: H
authors.lastname: Jia
authors.forename: Xiangtao
authors.initials: X
authors.lastname: Bai
authors.forename: Lijuan
authors.initials: L
authors.lastname: Shi
authors.forename: Fei
authors.initials: F
authors.lastname: Lu
authors.forename: Liqiang
authors.initials: L
authors.lastname: Zheng