Ferric ion-assisted in situ synthesis of silver nanoplates on polydopamine-coated silk.
J Colloid Interface Sci
; 479: 244-250, 2016 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-27390855
ABSTRACT
In the present study, a ferric ion (Fe(3+))-assisted in situ synthesis approach was developed to grow silver (Ag) nanoplates on the polydopamine (PDA)-coated silk without the use of additional reductants. The essential role of Fe(3+) in the formation of Ag nanoplates is revealed by comparing the morphologies of Ag nanostructures prepared on the silk-coated PDA film with/without Fe(3+) doping. Scanning electron micrographs show that high-density Ag nanoplates could be synthesized in the reaction system containing 50µg/mL FeCl3 and 50mM AgNO3. The size of the Ag nanoplate could be tuned by adjusting the reaction duration. Based on the data, a mechanism involving the Fe(3+)-selected growth of Ag atoms along the certain crystal faces was proposed to explain the fabrication process. Transmission electron microscopy and X-ray diffractometry indicate that the Ag nanoplates possess good crystalline structures. Raman spectra demonstrate that the nanoplates could strongly enhance the Raman scattering of the PDA molecules. The Ag nanoplate-coated silk could be utilized as a flexible substrate for the development of surface-enhanced Raman scattering biosensors.
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MEDLINE
Assunto principal:
Polímeros
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Prata
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Compostos Férricos
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Seda
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Nanopartículas Metálicas
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Indóis
Idioma:
En
Revista:
J Colloid Interface Sci
Ano de publicação:
2016
Tipo de documento:
Article