Silver nanocrystal superlattice coating for molecular sensing by surface-enhanced Raman spectroscopy

Qiu, Teng; Wu, Xuezhong; Shen, Jian; Chu, Paul K.

doi:10.1063/1.2357548

Cited by 38 publications

(28 citation statements)

References 20 publications

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“…[26] Although small NPs/nanocrystals of Au and Ag are usually considered having low intrinsic Raman cross-section, the assemblies or superlattices formed by these nanocrystals have shown good SERS activity. [27] Direct measurement of the Raman spectrum of the GPS gives a typical SERS spectrum of DNA ( Figure S11, Supporting Information).…”

Section: Electrochemical and Sers Response Of The I-motif-gps Upon Vamentioning

confidence: 99%

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

Liu

Jiang

Pang

et al. 2017

Adv Funct Materials

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With controllable mass transfer and special optical properties, plasmonic nanopores may be applied as a nanodevice and possibly create a new generation of single molecule detection technique based on plasmon-enhanced spectra. In the present study, gold nanoparticles self-assemble into a gold porous sphere (GPS) on the tip of a glass nanopipette with the help of i-motif DNA thiolated by both ends as linker molecules. The gaps among neighboring gold nanoparticles are considered as plasmonic nanopores. The size of the formed nanopores can be tuned by the folded-unfolded conformational change of i-motif DNA upon pH adjustment from 4.5 to 7.0. Based on its tunable structural property, the GPS shows reversible changes in ionic current, potential, and surface-enhanced Raman scattering signal. The GPS is further used to probe regional pH in single cells. The successful application of GPS in multiparameter pH probing and single cell analysis suggests that the new physical properties of the self-assembled plasmonic nanopores can be used for fabricating multiple types of nanodevices and nanosensors.

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Section: Electrochemical and Sers Response Of The I-motif-gps Upon Vamentioning

confidence: 99%

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

Liu

Jiang

Pang

et al. 2017

Adv Funct Materials

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“…However, an outstanding challenge of SERS‐based detection is the lack of robust and facile fabrication routines for SERS substrates with considerable enhancements. Traditionally, electrochemically roughened metal surfaces,18 colloids,19 island films,20, 21 nanowires,22 periodic arrays,23, 24 and self‐assembled nanoparticles25, 26 are employed as SERS substrates (for a recent review, see Reference 27). However, the long‐term stability of aggregated nanoparticles is the main obstacle for assembled structures, and the fabrication of complex surface structures (e.g.…”

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confidence: 99%

Nanoparticle‐Decorated Nanocanals for Surface‐Enhanced Raman Scattering

Tsukruk

2008

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“…The corresponding SERS enhancement factor is ca. 1.8 Â 10 8 , which is far higher than those of 1 Â 10 5 and 1 Â 10 6 reported in the SERS studies [44,45] based on Ag nanocrystals on Si [44] and Au-coated ZnO nanorods [45], respectively. The Electron transfer from the electron-hole pairs of TiO 2 NPs to the TiO 2 -adsorbed positively charged Au ions was responsible for the preparation of highly SERS-active Au/TiO 2 films on the substrate using photoreduction under UV light of 310 nm.…”

Section: Discussionmentioning

confidence: 51%