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Ultrasensitive Surface-Enhanced Raman Scattering Platform for Protein Detection via Active Delivery to Nanogaps as a Hotspot.
ACS Nano
August 2024
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan.
Surface-enhanced Raman scattering (SERS) is an attractive technique in molecular detection with high sensitivity and label-free characteristics. However, its use in protein detection is limited by the large volume of proteins, hindering its approach to the narrow spaces of hotspots. In this study, we fabricated a Au nanoTriangle plate Array on Gel (AuTAG) as an SERS substrate by attaching a Au nanoTriangle plate (AuNT) arrangement on a thermoresponsive hydrogel surface.
View Article and Find Full Text PDFOpen-Nanogap-Induced Strong Electromagnetic Enhancement in Au/AgAu Monolayer as a Stable and Uniform SERS Substrate for Ultrasensitive Detection.
Anal Chem
May 2024
Department of Physics, College of Science, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Nanogap-based plasmonic metal nanocrystals have been applied in surface-enhanced Raman scattering detection, while the closed and insufficient electromagnetic fields as well as the nonreproducible Raman signal of the substrate greatly restrict the actual application. Herein, a highly uniform Au/AgAu monolayer with abundant nanogaps and huge electromagnetic enhancement is prepared, which shows ultrasensitive and reproducible SERS detection. Au/AgAu with an inner nanogap is first prepared based on Au nanotriangles, and the nanogap is opened from the three tips via a subsequent etching process.
View Article and Find Full Text PDFA Review on Gold Nanotriangles: Synthesis, Self-Assembly and Their Applications.
Molecules
December 2022
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
Gold nanoparticles (AuNPs) with interesting optical properties have attracted much attention in recent years. The synthesis and plasmonic properties of AuNPs with a controllable size and shape have been extensively investigated. Among these AuNPs, gold nanotriangles (AuNTs) exhibited unique optical and plasmonic properties due to their special triangular anisotropy.
View Article and Find Full Text PDFAdiponectin-targeted SERS immunoassay biosensing platform for early detection of gestational diabetes mellitus.
Biosens Bioelectron
October 2022
Department of Biomedical Engineering, College of Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea. Electronic address:
The anisotropic gold nanotriangles (AuNTs) were synthesized by a fast seedless growth process. The high-yield monodispersed AuNT colloids were obtained through a purification process based on depletion-induced interactions. AuNTs were modulated with a localized surface plasmon resonance (LSPR) peak of 638 nm wavelength coherent with the Raman excitation light.
View Article and Find Full Text PDFNano-sandwich composite by kinetic trapping assembly from protein and nucleic acid.
Nucleic Acids Res
September 2021
Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
Design and preparation of layered composite materials alternating between nucleic acids and proteins has been elusive due to limitations in occurrence and geometry of interaction sites in natural biomolecules. We report the design and kinetically controlled stepwise synthesis of a nano-sandwich composite by programmed noncovalent association of protein, DNA and RNA modules. A homo-tetramer protein core was introduced to control the self-assembly and precise positioning of two RNA-DNA hybrid nanotriangles in a co-parallel sandwich arrangement.
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