Lab 5 Au nanopareticles - MAE C187L/C287L Nano Lab Lab 5...

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MAE C187L/C287L Nano Lab Lab 5: Synthesis of Gold Nanoparticles May 2, 2008 TA: Zhen Gu (Zenger) [email protected] 1. Introduction Gold nanoparticle, also known as “colloidal gold”, is a suspension (or colloid ) of nanoscale particles of gold in a fluid, usually aqueous solution. The liquid is generally either an intense red color (for particles less than 100 nm ), or a dirty yellowish color (for larger particles). The nanoparticles themselves can come in a variety of shapes, including spheres, rods, cubes, and caps. Recently, considerable attention has been paid to gold nanoparticle because of its potential applications in fields like electronics, optoelectronics, and bio-sensors, amongst others. The objective of this experiment is to synthesize Au nanoparticles by reduction of Au (III) using sodium citrate. The overall reaction of synthesis of Au nanoparticle is as follows: - OOC COO - COO - HO + Au 3+ - OOC COO - O Au (s) + CO 2 (g) + 2. Nanoparticle synthesis 2.1 Materials and Equipments All of the chemicals are obtained from Sigma-Aldrich Company and used without further purification. The water (dH 2 O) used in the whole process is prepared by a Millipore NanoPure purification system (resistivity higher than 18.2 MΩ•cm -1 ). All glassware used here is thoroughly cleaned in aqua
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