scholarly journals A dielectrophoretic chip with a roughened metal surface for on-chip surface-enhanced Raman scattering analysis of bacteria

2010 ◽  
Vol 4 (3) ◽  
pp. 034104 ◽  
Author(s):  
I-Fang Cheng ◽  
Chi-Chang Lin ◽  
Dong-Yi Lin ◽  
Hsien-Chang Chang
Keyword(s):  
Raman Scattering ◽  
Metal Surface ◽  
Surface Enhanced Raman Scattering ◽  
Chip Surface ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
On Chip

scholarly journals On-chip surface-enhanced Raman scattering detection using integrated liquid-core waveguides

2007 ◽  
Vol 90 (21) ◽  
pp. 211107 ◽  
Author(s):  
Philip Measor ◽  
Leo Seballos ◽  
Dongliang Yin ◽  
Jin Z. Zhang ◽  
Evan J. Lunt ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Liquid Core ◽  
Surface Enhanced Raman Scattering ◽  
Chip Surface ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
On Chip ◽  
Liquid Core Waveguides

On-Chip Immunoassay Using Surface-Enhanced Raman Scattering of Hollow Gold Nanospheres

2010 ◽  
Vol 82 (12) ◽  
pp. 5290-5295 ◽  
Author(s):  
Hyangah Chon ◽  
Chaesung Lim ◽  
Seung-Mo Ha ◽  
Yoomin Ahn ◽  
Eun Kyu Lee ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Gold Nanospheres ◽  
Hollow Gold Nanospheres ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
On Chip

Nanocomposite mesoporous ordered films for lab-on-chip intrinsic surface enhanced Raman scattering detection

Nanoscale ◽  
2011 ◽  
Vol 3 (9) ◽  
pp. 3760 ◽  
Author(s):  
Luca Malfatti ◽  
Paolo Falcaro ◽  
Benedetta Marmiroli ◽  
Heinz Amenitsch ◽  
Massimo Piccinini ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Lab On Chip ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
On Chip ◽  
Ordered Films

scholarly journals The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement

2018 ◽  
Vol 9 ◽  
pp. 2236-2247 ◽  
Author(s):  
Nicolae Leopold ◽  
Andrei Stefancu ◽  
Krisztian Herman ◽  
István Sz Tódor ◽  
Stefania D Iancu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Metal Surface ◽  
Surface Enhanced Raman Scattering ◽  
Electronic Coupling ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Chloride-capped silver nanoparticles (Cl-AgNPs) allow for high-intensity surface-enhanced Raman scattering (SERS) spectra of cationic molecules to be obtained (even at nanomolar concentration) and may also play a key role in understanding some fundamental principles behind SERS. In this study, we describe a fast (<10 min) and simple protocol for obtaining highly SERS-active colloidal silver nanoparticles (AgNPs) with a mean diameter of 36 nm by photoconversion from AgCl precursor microparticles in the absence of any organic reducing or capping agent. The resulting AgNPs are already SERS-activated by the Cl− ions chemisorbed onto the metal surface where the chloride concentration in the colloidal solution is 10−2 M. Consequently, the enhanced SERS spectra of cationic dyes (e.g., crystal violet or 9-aminoacridine) demonstrate the advantages of Cl-AgNPs compared to the as-synthesized AgNPs obtained by standard Ag+ reduction with hydroxylamine (hya-AgNPS) or citrate (cit-AgNPs). The results of SERS experiments on anionic and cationic test molecules comparing Cl-AgNPs, hya-AgNPs and cit-AgNPs colloids activated with different amounts of Cl− and/or cations such as Ag+, Mg2+ or Ca2+ can be explained within the understanding of the adatom model – the chemisorption of cationic analytes onto the metal surface is mediated by the Cl− ions, whereas ions like Ag+, Mg2+ or Ca2+ mediate the electronic coupling of anionic species to the silver metal surface. Moreover, the SERS effect is switched on only after the electronic coupling of the adsorbate to the silver surface at SERS-active sites. The experiments presented in this study highlight the SERS-activating role played by ions such as Cl−, Ag+, Mg2+ or Ca2+, which is a process that seems to prevail over the Raman enhancement due to nanoparticle aggregation.

Optofluidic Surface Enhanced Raman Scattering Chip for Detection of Dengue Virus

2008 ◽  
Author(s):  
Yun Suk Huh ◽  
Aram J. Chung ◽  
Bernardo Cordovez ◽  
David Erickson
Keyword(s):  
Raman Scattering ◽  
Dengue Virus ◽  
Limit Of Detection ◽  
Surface Enhanced Raman Scattering ◽  
Virus Serotype ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Total Analysis ◽  
Enhanced Raman Scattering ◽  
On Chip

In this work we describe the development of an optofluidic device for surface enhanced Raman scattering (SERS) based detection of biological pathogens. The chip exploits the use of electro-active microwells which serve to both physically concentrate the Raman enhancers and to reduce the total analysis time through a unique electrokinetically driven on-chip mixing effect. To quantify the concentration performance of the device we use 44 nm polystyrene particles at low electric field strength (between 1.00–2.00 V) and demonstrate close to 90% concentration saturation within 2.5 s. We demonstrate the mixing capability through the enhanced detection of dengue virus serotype 2 (DENV-2). With DENV-2, we successfully detected the SERS signals with a limit of detection of 30 pM.

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