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Ahla Jo,Tae-Han Kim,Dong-Min Kim,김형모,Bomi Seong,Jaehi Kim,Xuan-Hung Pham,정흥수,Sang Hun Lee,Do Won Hwang,Dae Hong Jeong,Yoon-Sik Lee,Dong-Eun Kim,Bong-Hyun Jun 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
As virus spread can lead to severe epidemics and pandemics associated with high mortality, it is necessary to have a highly sensitive detection method for viruses. Although various detection methods have been developed so far, current methods in detecting a virus require preprocessing and involve quite intricate processes of low sensitivity. Here, we have developed a virus detection method with a broad dynamic range and high sensitivity, based on immuno-complex formation between quantum dot (QD)- embedded silica nanoparticles (QD2 ) and magnetic beads. The multiple QD- containing QD2 s showed 500 times stronger photoluminescence than individual QDs. When biotin was immobilized as a ligand, streptavidin was detected in a range of 10 zM to 10 nM. The clinical applicability of the QD2 -based system was examined using the avian virus (i.e., H1N1 influenza virus), and it showed a detection range of 4.76 × 10-4 < span class="xps_thinspace"> ~ 3.2 hemagglutination unit/mL. This result is comparable to the polymerase chain reaction method, and is approximately 2100 times more sensitive than the conventional hemagglutination method. Since the QD2 -based system could detect target molecules with high sensitivity without requiring an amplification step, it can be applied in various biomedical and clinical fields.
Chang, Hyejin,Kang, Homan,Yang, Jin-Kyoung,Jo, Ahla,Lee, Ho-Young,Lee, Yoon-Sik,Jeong, Dae Hong American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>It is critical to create isotropic hot spots in developing a reproducible, homogeneous, and ultrasensitive SERS probe. Here, an Ag shell–Au satellite (Ag–Au SS) nanostructure composed of an Ag shell and surrounding Au nanoparticles was developed as a near-IR active SERS probe. The heterometallic shell-satellite structure based SERS probe produced intense and uniform SERS signals (SERS enhancement factor ∼1.4 × 10<SUP>6</SUP> with 11% relative standard deviation) with high detectability (100% under current measurement condition) by 785 nm photoexcitation. This signal enhancement was independent of the laser polarizations, which reflects the isotropic feature of the SERS activity of Ag–Au SS from the three-dimensional (3D) distribution of SERS hot spots between the shell and the surrounding satellite particles. The Ag–Au SS nanostructure shows a great potential as a reproducible and quantifiable NIR SERS probe for in vivo targets.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am503675x/production/images/medium/am-2014-03675x_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503675x'>ACS Electronic Supporting Info</A></P>
Yang, Jin-Kyoung,Kang, Homan,Lee, Hyunmi,Jo, Ahla,Jeong, Sinyoung,Jeon, Su-Ji,Kim, Hye-In,Lee, Ho-Young,Jeong, Dae Hong,Kim, Jong-Ho,Lee, Yoon-Sik American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We explored a single-step approach for the rapid growth of Ag nanoshells (Ag NSs) under mild conditions. Without predeposition of seed metals, a uniform and complete layer of Ag shells was rapidly formed on silica core particles within 2 min at 25 °C via single electron transfer from octylamine to Ag<SUP>+</SUP> ions. The size and thickness of the Ag NSs were effectively tuned by adjusting the concentration of silica nanoparticles (silica NPs) with optimal concentrations of AgNO<SUB>3</SUB> and octylamine. This unusually rapid growth of Ag NSs was attributed to a significant increase in the reduction potential of the Ag<SUP>+</SUP> ions in ethylene glycol (EG) through the formation of an Ag/EG complex, which in turn led to their facile reduction by octylamine, even at room temperature. A substantial enhancement in the surface-enhanced Raman scattering (SERS) of the prepared Ag NSs was demonstrated. The Ag NSs were also utilized as SERS-active nanostructures for label-free detection of the pesticide thiram. The Ag NS-based SERS approach successfully detected thiram on apple peel down to the level of 38 ng/cm<SUP>2</SUP> in a label-free manner, which is very promising with respect to its potential use for the on-site detection of residual pesticides.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am502435x/production/images/medium/am-2014-02435x_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am502435x'>ACS Electronic Supporting Info</A></P>
One-step synthesis of silver nanoshells with bumps for highly sensitive near-IR SERS nanoprobes
Kang, Homan,Yang, Jin-Kyoung,Noh, Mi Suk,Jo, Ahla,Jeong, Sinyoung,Lee, Minwoo,Lee, Somin,Chang, Hyejin,Lee, Hyunmi,Jeon, Su-Ji,Kim, Hye-In,Cho, Myung-Haing,Lee, Ho-Young,Kim, Jong-Ho,Jeong, Dae Hong,L The Royal Society of Chemistry 2014 Journal of Materials Chemistry B Vol.2 No.28
<P>A seedless, one-step synthetic route to uniform bumpy silver nanoshells (AgNSs) as highly NIR sensitive SERS substrates is reported. These substrates can incorporate Raman label compounds and biocompatible polymers on their surface. AgNS based NIR-SERS probes are successfully applied to cell tracking in a live animal using a portable Raman system.</P>