Shape and color of au nanoparticles follow biocatalytic processes.
The NAD(P)H-mediated growth of Au nanoparticles (NPs) in the presence of ascorbic acid, AuCl4-, and cetyltrimethylammonium bromide leads to the formation of shaped NP structures consisting of dipods, tripods, and tetrapods. The shaped particles exhibit a red-shifted plasmon absorbance at lambda = 680 nm, consistent with the existence of a longitudinal plasmon exciton. High-resolution transmission electron microscopy analysis of the tripod and tetrapod structures reveals directional growth along the <211> and <010> directions, respectively. The shaped Au NPs could be generated by a biocatalytic process using alcohol dehydrogenase, NAD+, and ethanol, and the resulting blue color provides a colorimetric test for ethanol.
Xiao
Yi
Y
Institute of Chemistry and The Unit for Nanoscopic Characterization, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
Shlyahovsky
Bella
B
Popov
Inna
I
Pavlov
Valeri
V
Willner
Itamar
I
D001205:Ascorbic Acid; D002384:Catalysis; D003461:Crystallography; D017612:Gold Compounds; D008854:Microscopy, Electron; D008958:Models, Molecular; D009243:NAD / Q000737:chemistry*; D009249:NADP / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction
D017612:Gold Compounds; D009243:NAD; C038016:gold chloride; D009249:NADP; D001205:Ascorbic Acid