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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A new SERS substrate based on niobium lead-pyrophosphate glasses obtained by Ag+/Na+ ion exchange

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Manzani, Danilo [1] ; Franco, Douglas F. [2] ; Afonso, Conrado R. M. [3] ; Sant'Ana, Antonio C. [4] ; Nalin, Marcelo [2] ; Ribeiro, Sidney J. L. [2]
Total Authors: 6
[1] Univ Sao Paulo, Sao Carlos Inst Chem IQSC, Dept Chem & Mol Phys, Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ UNESP, Inst Chem, Araraquara, SP - Brazil
[3] Fed Univ Sao Carlos UFSCar, Mat Engn Dept DEMa, Sao Carlos, SP - Brazil
[4] Fed Univ Juiz de Fora UFJF, Dept Chem, Juiz De Fora, MG - Brazil
Total Affiliations: 4
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 277, p. 347-352, DEC 20 2018.
Web of Science Citations: 0

Surface-enhanced Raman scattering (SERS) is one of the most sensitive methods for the detection of adsorbed molecules on the nanostructured coinage-metal surface. The enhancements in the order of 104-106 are routinely observed. Such an effect makes SERS spectroscopy a technique applicable to the study the adsorption of analytes in the submonolayer regime. Novel SERS sensors require novel substrates with high activity for great sensibility detection of different molecules applied in many fields, such as detections of narcotics, explosives, and molecules with biological interest. In this work, silver nanoparticles embedded in niobium lead-pyrophosphate glasses (Pb2P2O7-Nb2O5-Na2O) were prepared by ion exchange process, where silver ions were introduced into glass surface by Ag /Na ion exchange (NaNO3:AgNO3 batch), and reduced to metallic silver by heat treatment at glass transition temperature (ca. 480 degrees C). The new substrate was characterized by Raman spectroscopy, optical absorption, transmission electron microscopy (TEM) and atomic force microscopy (AFM). Its application in SERS was demonstrated by studying the adsorption of 2,2-bipyridine (bpy) on the glass surface, which has marker bands for the coordination of the adsorbate with silver atoms. The optimal surface features in terms of SERS enhancement were also discussed and the sensing ability of this new substrate was demonstrated. (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/16900-9 - Preparation of heavy metal oxide glasses fibers with optical and magneto-optical properties
Grantee:Douglas Faza Franco
Support type: Scholarships in Brazil - Post-Doctorate