Abstract
Many previously reported syntheses of gold nanoparticles required lengthy reaction times, complicated operations, high temperatures, or multi-step manipulations. In this work, a morphology-controlled versatile one-pot synthesis of hydrophobic gold nanodots, nanobars, nanorods, and nanowires has been developed. A series of gold nanomaterials ranging from round nanodots, short nanobars, and long nanorods to ultrathin and ultralong nanowires (diameter <2 nm, length >2 μm) have been readily prepared by simply adjusting the feeding ratio of chloroauric acid to oleylamine, oleic acid, and triphenylsilane. The silk-like ultralong and ultrathin nanowires were found to have a single crystalline structure and may have significant potential applications in microelectronics and biosensors. Large sizes of gold spherical nanoparticles were obtained from gold nanodots via a seed-mediated growth approach. These nanoparticles and ultralong nanowires showed excellent surface-enhanced Raman scattering (SERS) activity in organic solvents and, therefore, were employed as efficient organic-soluble SERS substrates for the detection of hydrophobic food toxicants, such as 3,4-benzopyrene, and carcinogens, such as benzidine.
Highlights
The morphology of prepared gold nanomaterials was observed on a transmission electron microscope (TEM, Tecnai G2 F30 S-Twin, FEI Company, Hillsboro, OR, The Netherlands) operating at an acceleration voltage of 300 kV
Images of of aa series series of of round round nanodots, nanodots, short short nanobars, nanobars, long long nanorods, nanorods, and and ultralong ultralong nanowires prepared with different molar ratios of
Are shown in Figure nanowires prepared with different molar ratios of [TPS]:[Au]:[oleic acid (OA)]:[OAm] are shown in Obviously, the morphologies of the gold nanomaterials could be controlled by changing the ratio of Obviously, the morphologies of the gold nanomaterials could be controlled by changing the ratio of
Summary
Colloidal gold nanoparticles have been employed as a highly efficient substrate for surface-enhanced Raman scattering (SERS) for almost 30 years—since 1979 [17]; this is due to their exceptional SERS enhancement factor, excellent stability, good biocompatibility, and wide commercial availability [18,19]. Gold spherical nanoparticles have been generally prepared via a citrate method as reported by Turkevich and Frens [20,21,22], biphasic method [23], and thermolysis method [24]. The citrate method produces nearly monodispersed colloidal gold nanoparticles with an average size of 10 to 100. Sci. 2019, 9, 935 nm, and these nanoparticles have served extensively as excellent substrates for SERS detection of a large variety of water-soluble analytes, such as dyes, protein, DNA/RNA, and food additives [25,26]
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