Moderating effect of ammonia on particle growth and stability of quasi-monodisperse silver nanoparticles synthesized by the Turkevich method

Autor(es)

Gorup, Luiz F. ; Longo, Elson ; Leite, Edson R. ; Camargo, Emerson R. ^[1]

Afiliação do(s) autor(es)

^[1] UFSCar Fed Univ Sao Carlos, LIEC Interdisciplinary Lab Electrochem & Ceram, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Colloid and Interface Science; v. 360, n. 2, p. 355-358, AUG 15 2011.
• Citações Web of Science: 50

Resumo

A new method to stabilize silver nanoparticles by the addition of ammonia is proposed. Colloidal dispersions of silver nanoparticles were synthesized by the Turkevich method using sodium citrate to reduce silver nitrate at high pH and at 90 degrees C. After approximately 12 min, a diluted ammonia solution was added to the reaction flask to form soluble diamine silver (I) complexes that played an important growth moderating role, making it possible to stabilize metallic silver nanoparticles with sizes as small as 1.6 nm after 17 min of reaction. Colloidal dispersions were characterized by UV-visible absorption spectroscopy, X-ray diffraction, and transmission electronic microscopy. (C) 2011 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 07/58891-7 - Perovskitas baseadas no titanato de chumbo modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM - the oxidant-peroxide method) e caracterizadas com uso complementar de espectroscopia Raman, difração de raios-X e microscopia eletrônica
• Beneficiário: Emerson Rodrigues de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular