Journal ArticleDOI
Shell Thickness-Dependent Raman Enhancement for Rapid Identification and Detection of Pesticide Residues at Fruit Peels
Bianhua Liu,Guangmei Han,Guangmei Han,Zhongping Zhang,Renyong Liu,Changlong Jiang,Suhua Wang,Ming-Yong Han,Ming-Yong Han +8 more
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TLDR
The shell thickness-dependent Raman enhancement of silver-coated gold nanoparticles (Au@Ag NPs) for the identification and detection of pesticide residues at various fruit peels is reported.Abstract:
Here, we report the shell thickness-dependent Raman enhancement of silver-coated gold nanoparticles (Au@Ag NPs) for the identification and detection of pesticide residues at various fruit peels. The Raman enhancement of Au@Ag NPs to a large family of sulfur-containing pesticides is ∼2 orders of magnitude stronger than those of bare Au and Ag NPs, and there is a strong dependence of the Raman enhancement on the Ag shell thickness. It has been shown for the first time that the huge Raman enhancement is contributed by individual Au@Ag NPs rather than aggregated Au@Ag NPs with “hot spots” among the neighboring NPs. Therefore, the Au@Ag NPs with excellent individual-particle enhancement can be exploited as stand-alone-particle Raman amplifiers for the surface identification and detection of pesticide residues at various peels of fruits, such as apple, grape, mango, pear, and peach. By casting the particle sensors onto fruit peels, several types of pesticide residues (e.g., thiocarbamate and organophosphorous c...read more
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Journal ArticleDOI
Core–Shell Nanoparticle-Enhanced Raman Spectroscopy
TL;DR: The concept of shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) in detail is introduced in detail because it overcomes the long-standing limitations of material and morphology generality encountered in traditional SERS.
Journal ArticleDOI
Flexible and Adhesive Surface Enhance Raman Scattering Active Tape for Rapid Detection of Pesticide Residues in Fruits and Vegetables.
Jiaming Chen,Youju Huang,Palanisamy Kannan,Lei Zhang,Zhenyu Lin,Jiawei Zhang,Tao Chen,Longhua Guo +7 more
TL;DR: A proof-of-concept surface enhance Raman scattering (SERS) active substrate serving directly to the rapid extraction and detection of target molecules is proposed and obtained strong and easily distinguishable SERS signals allow us to detect various pesticide residues in the real samples with complex surfaces.
Journal ArticleDOI
Toward Flexible Surface-Enhanced Raman Scattering (SERS) Sensors for Point-of-Care Diagnostics
TL;DR: The flexible SERS substrates with low‐cost, batch‐fabrication, and easy‐to‐operate characteristics can be integrated into portable Raman spectroscopes for point‐of‐care diagnostics, which are conceivable to penetrate global markets and households as next‐generation wearable sensors in the near future.
Journal ArticleDOI
A review of vibrational spectroscopic techniques for the detection of food authenticity and adulteration
TL;DR: Vibrational spectroscopic techniques have potential to fulfill the industrial need for food quality and authenticity analysis, however, still requires measurement accessories and dynamic chemomatric analytical methods for modern food inspection.
Journal ArticleDOI
Review of surface enhanced Raman spectroscopic (SERS) detection of synthetic chemical pesticides
TL;DR: A comprehensive report of recent advances in SERS detection of synthetic chemical pesticides is given in this article, where the main advantages of using SERS for pesticide detection are highlighted, together with its limitations.
References
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Journal ArticleDOI
Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering
Shuming Nie,Steven R. Emory +1 more
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Journal ArticleDOI
Shell-isolated nanoparticle-enhanced Raman spectroscopy
Jian-Feng Li,Yi-Fan Huang,Yong( Georgia Inst Technol Sch Mat Sci Engn) Ding,Zhilin Yang,Song Bo Li,Xiao-Shun Zhou,Fengru Fan,Fengru Fan,Wei Zhang,Zhi-You Zhou,De-Yin Wu,Bin Ren,Zhong Lin( Georgia Inst Technol Sch Mat Sci Engn) Wang,Zhong-Qun Tian +13 more
TL;DR: Shell-isolated nanoparticle-enhanced Raman spectroscopy is reported, in which the Raman signal amplification is provided by gold nanoparticles with an ultrathin silica or alumina shell, which significantly expands the flexibility of SERS for useful applications in the materials and life sciences, as well as for the inspection of food safety, drugs, explosives and environment pollutants.
Journal ArticleDOI
Controlling the synthesis and assembly of silver nanostructures for plasmonic applications
Matthew Rycenga,Claire M. Cobley,Jie Zeng,Weiyang Li,Christine H. Moran,Qiang Zhang,Dong Qin,Younan Xia +7 more
TL;DR: In plasmonics, the metal nanostructures can serve as antennas to convert light into localized electric fields (E-fields) or as waveguides to route light to desired locations with nanometer precision through a strong interaction between incident light and free electrons in the nanostructure.
PatentDOI
In vivo tumor targeting and spectroscopic detection with surface-enhanced Raman nanoparticle tags
TL;DR: In this article, the authors described the nanostructures, methods of preparing nanostructure, methods for detecting targets in subjects, and methods of treating diseases in subjects. An embodiment, among others, includes a metallic gold surface-enhanced Raman scattering nanoparticle, a Raman reporter and a protection structure.
Journal ArticleDOI
Nanogap-engineerable Raman-active nanodumbbells for single-molecule detection
TL;DR: Atomic-force-microscope-correlated nano-Raman measurements of individual dumbbell structures demonstrate that Raman signals can be repeatedly detected from single-DNA-tethered nanodumbbells and open avenues for the high-yield synthesis of optically active smart nanoparticles and structurally reproducible nanostructure-based single-molecule detection and bioassays.
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