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Focused-ion-beam-fabricated Au nanorods coupled with Ag nanoparticles used as surface-enhanced Raman scattering-active substrate for analyzing trace melamine constituents in solution.
Anal Chim Acta. 2013 Oct 24; 800:56-64.AC

Abstract

A well-ordered Au-nanorod array with a controlled tip ring diameter (Au_NRsd) was fabricated using the focused ion beam method. Au_NRsd was then coupled with Ag nanoparticles (Ag NPs) to bridge the gaps among Au nanorods. The effect of surface-enhanced Raman scattering (SERS) on Au_NRsd and Ag NPs/Au_NRsd was particularly verified using crystal violet (CV) as the molecular probe. Raman intensity obtained from a characteristic peak of CV on Au_NRsd was estimated by an enhancement factor of ≈10(7) in magnitude, which increased ≈10(12) in magnitude for that on Ag NPs/Au_NRsd. A highly SERS-active Ag NPs/Au_NRsd was furthermore applied for the detection of melamine (MEL) at very low concentrations. Raman-active peaks of MEL (10(-3) to 10(-12)M) in water or milk solution upon Au_NRsd or Ag NPs/Au_NRsd were well distinguished. The peaks at 680 and 702 cm(-1) for MEL molecules were found suitable to be used as the index for sensing low-concentration MEL in a varied solution, while that at 1051 cm(-1) was practical to interpret MEL molecules in water or milk solution bonded with Au (i.e., Au_NRsd) or Ag (i.e., Ag NPs/Au_NRsd) surface. At the interface of Ag NPs/Au_NRsd and MEL molecules in milk solution, a laser-induced electromagnetic field or hotspot effect was produced and competent to sense low-concentration MEL molecules interacting with Ag and Au surfaces. Accordingly, Ag NPs/Au_NRsd is very promising to be used as a fast and sensitive tool for screening MEL in complex matrices such as adulteration in e.g., food and pharmaceutical products.

Authors+Show Affiliations

Department of Materials Science and Engineering, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24120168

Citation

Sivashanmugan, Kundan, et al. "Focused-ion-beam-fabricated Au Nanorods Coupled With Ag Nanoparticles Used as Surface-enhanced Raman Scattering-active Substrate for Analyzing Trace Melamine Constituents in Solution." Analytica Chimica Acta, vol. 800, 2013, pp. 56-64.
Sivashanmugan K, Liao JD, Liu BH, et al. Focused-ion-beam-fabricated Au nanorods coupled with Ag nanoparticles used as surface-enhanced Raman scattering-active substrate for analyzing trace melamine constituents in solution. Anal Chim Acta. 2013;800:56-64.
Sivashanmugan, K., Liao, J. D., Liu, B. H., & Yao, C. K. (2013). Focused-ion-beam-fabricated Au nanorods coupled with Ag nanoparticles used as surface-enhanced Raman scattering-active substrate for analyzing trace melamine constituents in solution. Analytica Chimica Acta, 800, 56-64. https://doi.org/10.1016/j.aca.2013.09.011
Sivashanmugan K, et al. Focused-ion-beam-fabricated Au Nanorods Coupled With Ag Nanoparticles Used as Surface-enhanced Raman Scattering-active Substrate for Analyzing Trace Melamine Constituents in Solution. Anal Chim Acta. 2013 Oct 24;800:56-64. PubMed PMID: 24120168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Focused-ion-beam-fabricated Au nanorods coupled with Ag nanoparticles used as surface-enhanced Raman scattering-active substrate for analyzing trace melamine constituents in solution. AU - Sivashanmugan,Kundan, AU - Liao,Jiunn-Der, AU - Liu,Bernard Haochih, AU - Yao,Chih-Kai, Y1 - 2013/09/16/ PY - 2013/07/18/received PY - 2013/08/26/revised PY - 2013/09/06/accepted PY - 2013/10/15/entrez PY - 2013/10/15/pubmed PY - 2014/5/23/medline KW - Ag nanoparticles KW - Au-nanorods KW - Focused ion beam KW - Melamine KW - Surface-enhanced Raman scattering SP - 56 EP - 64 JF - Analytica chimica acta JO - Anal Chim Acta VL - 800 N2 - A well-ordered Au-nanorod array with a controlled tip ring diameter (Au_NRsd) was fabricated using the focused ion beam method. Au_NRsd was then coupled with Ag nanoparticles (Ag NPs) to bridge the gaps among Au nanorods. The effect of surface-enhanced Raman scattering (SERS) on Au_NRsd and Ag NPs/Au_NRsd was particularly verified using crystal violet (CV) as the molecular probe. Raman intensity obtained from a characteristic peak of CV on Au_NRsd was estimated by an enhancement factor of ≈10(7) in magnitude, which increased ≈10(12) in magnitude for that on Ag NPs/Au_NRsd. A highly SERS-active Ag NPs/Au_NRsd was furthermore applied for the detection of melamine (MEL) at very low concentrations. Raman-active peaks of MEL (10(-3) to 10(-12)M) in water or milk solution upon Au_NRsd or Ag NPs/Au_NRsd were well distinguished. The peaks at 680 and 702 cm(-1) for MEL molecules were found suitable to be used as the index for sensing low-concentration MEL in a varied solution, while that at 1051 cm(-1) was practical to interpret MEL molecules in water or milk solution bonded with Au (i.e., Au_NRsd) or Ag (i.e., Ag NPs/Au_NRsd) surface. At the interface of Ag NPs/Au_NRsd and MEL molecules in milk solution, a laser-induced electromagnetic field or hotspot effect was produced and competent to sense low-concentration MEL molecules interacting with Ag and Au surfaces. Accordingly, Ag NPs/Au_NRsd is very promising to be used as a fast and sensitive tool for screening MEL in complex matrices such as adulteration in e.g., food and pharmaceutical products. SN - 1873-4324 UR - https://www.unboundmedicine.com/medline/citation/24120168/Focused_ion_beam_fabricated_Au_nanorods_coupled_with_Ag_nanoparticles_used_as_surface_enhanced_Raman_scattering_active_substrate_for_analyzing_trace_melamine_constituents_in_solution_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-2670(13)01182-3 DB - PRIME DP - Unbound Medicine ER -