01877nas a2200181   4500008004100000022001400041245018800055210006900243260007700312300001200389490000700401520107600408100002301484700002301507700001701530700001901547856012901566       2014                        eng d  a2192-650600aModulation of reaction kinetics for the tuneable synthesis of gold nanoparticles and quantum clusters: application of gold quantum clusters as ``turn-off'' sensing probe for Sn4+ ions0 aModulation of reaction kinetics for the tuneable synthesis of go  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJAN  a134-1420 v793 a<p>The syntheses of gold nanoparticles (Au NPs) and gold quantum clusters (Au QCs) that employ cefadroxil (CFX; an antibiotic) as both reducing and capping agents are reported. The HAuCl4/CFX concentration, temperature, and pH are crucial factors in the modulation of the nucleation and growth kinetics of the reaction, and consequently, in guiding the size and morphology of as-synthesized Au NPs. Interesting results are observed if the reaction is performed under different pH conditions. TEM analysis of the Au NPs synthesized at pH 6 shows an average particle size of approximately 2 nm along with a relatively smaller population of bigger NPs (up to 6 nm). The Au QCs were isolated by high-speed centrifugation and showed fluorescence at lambda approximate to 460 nm. Furthermore, the as-synthesized Au QCs were applied as sensor for Sn4+ ions on the basis of an aggregation-induced fluorescence quenching mechanism. These Au QCs offer acceptable sensitivity, high selectivity, and a limit of detection of approximately 10 mm for the determination of Sn4+ ions.</p>1 aKhandelwal, Puneet1 aSingh, Dheeraj, K.1 aSadhu, Subha1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/modulation-reaction-kinetics-tuneable-synthesis-gold-nanoparticles-and-quantum-clusters-0