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Rainbow Radiating Single-Crystal Ag Nanowire Nanoantenna
Kang, Taejoon,Choi, Wonjun,Yoon, Ilsun,Lee, Hyoban,Seo, Min-Kyo,Park, Q-Han,Kim, Bongsoo American Chemical Society 2012 Nano letters Vol.12 No.5
<P>Optical antennas interface an object with optical radiation and boost the absorption and emission of light by the objects through the antenna modes. It has been much desired to enhance both excitation and emission processes of the quantum emitters as well as to interface multiwavelength channels for many nano-optical applications. Here we report the experimental implementation of an optical antenna operating in the full visible range via surface plasmon currents induced in a defect-free single-crystalline Ag nanowire (NW). With its atomically flat surface, the long Ag NW reliably establishes multiple plasmonic resonances and produces a unique rainbow antenna radiation in the Fresnel region. Detailed antenna radiation properties, such as radiating near-field patterns and polarization states, were experimentally examined and precisely analyzed by numerical simulations and antenna theory. The multiresonant Ag NW nanoantenna will find superb applications in nano-optical spectroscopy, high-resolution nanoimaging, photovoltaics, and nonlinear signal conversion.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-5/nl3002414/production/images/medium/nl-2012-002414_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl3002414'>ACS Electronic Supporting Info</A></P>
Patterned Multiplex Pathogen DNA Detection by Au Particle-on-Wire SERS Sensor
Kang, Taejoon,Yoo, Seung Min,Yoon, Ilsun,Lee, Sang Yup,Kim, Bongsoo American Chemical Society 2010 NANO LETTERS Vol.10 No.4
<P>A Au particle-on-wire system that can be used as a specific, sensitive, and multiplex DNA sensor is developed. A pattern formed by multiple Au nanowire sensors provides positional address and identification for each sensor. By using this system, multiplex sensing of target DNAs was possible in a quantitative manner with a detection limit of 10 pM. Target DNAs from reference bacteria and clinical isolates were successfully identified by this sensor system, enabling diagnostics for infectious diseases.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-4/nl1000086/production/images/medium/nl-2010-000086_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl1000086'>ACS Electronic Supporting Info</A></P>
Subcellular Neural Probes from Single-Crystal Gold Nanowires
Kang, Mijeong,Jung, Seungmoon,Zhang, Huanan,Kang, Taejoon,Kang, Hosuk,Yoo, Youngdong,Hong, Jin-Pyo,Ahn, Jae-Pyoung,Kwak, Juhyoun,Jeon, Daejong,Kotov, Nicholas A.,Kim, Bongsoo American Chemical Society 2014 ACS NANO Vol.8 No.8
<P/><P>Size reduction of neural electrodes is essential for improving the functionality of neuroprosthetic devices, developing potent therapies for neurological and neurodegenerative diseases, and long-term brain–computer interfaces. Typical neural electrodes are micromanufactured devices with dimensions ranging from tens to hundreds of micrometers. Their further miniaturization is necessary to reduce local tissue damage and chronic immunological reactions of the brain. Here we report the neural electrode with subcellular dimensions based on single-crystalline gold nanowires (NWs) with a diameter of ∼100 nm. Unique mechanical and electrical properties of defect-free gold NWs enabled their implantation and recording of single neuron-activities in a live mouse brain despite a ∼50× reduction of the size compared to the closest analogues. Reduction of electrode dimensions enabled recording of neural activity with improved spatial resolution and differentiation of brain activity in response to different social situations for mice. The successful localization of the epileptic seizure center was also achieved using a multielectrode probe as a demonstration of the diagnostics potential of NW electrodes. This study demonstrated the realism of single-neuron recording using subcellular-sized electrodes that may be considered a pivotal point for use in diverse studies of chronic brain diseases.</P>
Development of a novel Antibody-Mediated SERS Immunoassay for Drug-Resistant Influenza Virus
Hyunju Kang,Juyeon Jung,Taejoon Kang 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
1. The novel antibody had a KD of 72.74 µM for wild-type NA and 32.76 pM for H275YNA, suggesting that it can distinguish drug-resistant influenza virus. 2. The novel antibody has been applied to dot-blot, enzyme-linked immunosorbent assay, bare-eye detection, and lateral flow assay to demonstrate the specificity of the antibody to the drug-resistant virus. 3. We immobilized the antibody onto atomically flat Au nanoplate and Au nanoparticles, demonstrating the surface-enhanced Raman scattering (SERS)-based immunoassay for oseltamivir-resistant influenza virus in human nasopharyngeal samples
Kang Ryong Choi,Seung Je Moon,Taejoon Kouh,In Bo Shim,Sam Jin Kim,Chul Sung Kim IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>CoCr<SUB>2</SUB>O<SUB>4</SUB>(CCO) materials show multiferroic effect that ferroelectricity and ferromagnetism co-exist. CCO film was deposited on Pt/Ti/Si/SiO<SUB>2</SUB> substrates by pulsed laser deposition (PLD). The CCO film were prepared using KrF(248 nm) excimer lasers and with a pressure of 100 mTorr, substrate temperatures of 700<SUP>deg</SUP>C . The crystal structure was found to be oriented {111} planes by means of X-ray diffraction (XRD) with Cu radiation. The morphology of film has showed triangle shapes. The ferrimagnetic transition was observed at around 95 K, which was determined as Neel temperature and spiral magnetic transition temperature (<I>T</I> <SUB>S</SUB>) was 21.5 K, while the <I>T</I> <SUB>S</SUB> of bulk CCO was 28.0 K. We note that decreasing of <I>T</I> <SUB>S</SUB> in CCO films is closely related to the preferred orientation of {111} direction.</P>
Choi, Kang Ryong,Kouh, Taejoon,Kim, Sam Jin,Kim, Chul Sung WILEY-VCH Verlag 2007 Physica status solidi. PSS. B, Basic solid state p Vol.244 No.12
<P>In order to elucidate the role of Cr ions in MCr<SUB>2</SUB>O<SUB>4</SUB>(M = Co, Zn) exhibiting geometrically frustration and multiferroic property, we have substituted a small amount of Fe ions for Cr sites and investigated the magnetic behavior of Fe ions with Mössbauer spectroscopy. The crystal structure was found to be single-phase cubic spinel with space group of Fd3m. The lattice constants a<SUB>0</SUB> and the internal structural parameter (x) of the oxygen were determined to be 8.340, 8.331 Å and 0.261 and 0.260, respectively. The Mössbauer absorption spectra at 4.2 K show that the well-developed two sextets are superposed with small difference of hyperfine fields(H<SUB>hf</SUB>). The hyperfine fields of CoCr<SUB>1.98</SUB><SUP>57</SUP>Fe<SUB>0.02</SUB>O<SUB>4 </SUB>and ZnCr<SUB>1.98</SUB><SUP>57</SUP>Fe<SUB>0.02</SUB>O<SUB>4</SUB> were determined to be 490 ∼ 480 kOe and 460 ∼ 450 kOe, respectively. Isomer shift values (δ) of the two sextets are found to be 0.33 ∼ 0.35 mm/s relative to those of Fe metal, which are consistent with the high spin Fe<SUP>3+</SUP> charge state. From the results of Mössbauer measurement, it is suggested that Cr<SUP>3+</SUP> ions have two different magnetic sites, and there is a correlation between hyperfine fields and degree of magnetic geometrical frustration. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>