Document Details Document Type : Article In Journal  Document Title : Time dependence of nucleation and growth of silver nanoparticles Time dependence of nucleation and growth of silver nanoparticles   Subject : Chemistry  Document Language : English  Abstract : This paper describes a simple procedure based on the modified silver-mirror process for the preparation of colloidal silver quantum dots (diameter ≤7nm). All reactions were monitored with respect to reaction time by using UV-visible studies to understand the growth kinetics and the influence of different [ammonia], [glucose] and temperature on the formation of silver nanoparticles. Shape of the reaction-time curves (sigmoid facing up and sigmoid facing down) strongly depend on the [NH3]. Glucose concentrations have no significant effect on the progress of the reaction. For the nucleation and growth processes, surface plasmon absorbance is directly proportional and increase-decrease with increasing [NH3], respectively. Transmission electron microscopy (TEM) results show that the quantum dots are aggregated in an irregular manner, resulting in the formation of branches-like structures of silver. The activation energy, enthalpy and entropy of activation have been evaluated. Mechanism consistent with the observed kinetics results has been suggested.  ISSN : 0927-7757  Journal Name : Colloids and Surfaces A: Physicochemical and Engineering Aspects  Volume : 381  Issue Number : 17  Publishing Year : 1432 AH 2011 AD  Article Type : Article  Added Date : Saturday, February 11, 2012  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email Javed Ijaz Hussain Hussain, Javed Ijaz Researcher Doctorate   Abou Talib Talib, Abou Researcher Doctorate   Sunil Kumar Kumar, Sunil Researcher Doctorate   شعيل أحمد الثبيتي AL-Thabaitia, Shaeel Ahmed Researcher Doctorate sthabiti@hotmail.com Athar Adil Hashmi Hashmi, Athar Adil Researcher Doctorate   ظهير خان Khan, Zaheer Researcher Doctorate drkhanchem@yahoo.co.in Files File Name Type Description  32247.pdf pdf Abstract Back To Researches Page