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RISS 인기검색어
- 검색키워드
- 저자 : Moskovits, Martin (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Kim, Nam Hoon,Meinhart, Carl D.,Moskovits, Martin American Chemical Society 2016 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.120 No.12
<P>Plasmonic nanosystems can enhance photochemical processes taking place in their neighborhood on account of several plasmonically mediated processes, among them: (i) the enhancement of the optical fields in the vicinity of the nanosystem and (ii) the intervention of energetic electrons and/or holes in the redox chemistry of nearby molecules pursuant to plasmon excitation and decay. We describe a series of experiments in which tetrachloroplatinate anions are reduced to zerovalent Pt at the surface of gold nanoparticles and nanoparticle assemblies. We demonstrate that the spatial pattern of deposited Pt cannot be understood in terms of enhanced fields alone but likely involves hot electrons whose momenta are initially aligned with the electric vector of the polarized light used to excite plasmons but become randomized on account of electron-electron interactions and scattering within the metallic nanoparticles before the electrons' energy is substantially thermalized. These conclusions are supported by numerical computations of the local electromagnetic fields scattered by gold nanoparticles, using a finite element approach. SERS measurements, carried out concurrently with the photoreduction, suggest that PtO2 is at least one of the oxidation products formed in the oxidation reaction(s) countervailing the above reduction reaction.</P>
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Evanko, Brian,Yoo, Seung Joon,Lipton, Jason,Chun, Sang-Eun,Moskovits, Martin,Ji, Xiulei,Boettcher, Shannon W.,Stucky, Galen D. The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.10
<P>A critical bottleneck in the development of aqueous electrochemical energy storage systems is the lack of viable complete cell designs. We report a metal-free, bipolar pouch cell designed with carbon black/polyethylene composite film (CBPE) current collectors as a practical cell architecture. The light-weight, corrosion-resistant CBPE provides stable operation in a variety of aqueous electrolytes over a ∼2.5 V potential range. Because CBPE is heat-sealable, it serves simultaneously as both the pouch cell packaging and seal in addition to its use as a current collector. Although this non-metallic composite has a low electrical conductivity relative to metal foils, current travels only a short distance in the through-plane direction of the current collector in the bipolar cell configuration. This shorter path length lowers the effective electrical resistance, making the design suitable for high-power applications. We test the cell architecture using an aqueous ZnBr2 battery chemistry and incorporate tetrabutylammonium cations to improve the intrinsic low Coulombic efficiency and fast self-discharge of non-flow ZnBr2 cells. These devices demonstrate a cell-level energy density of 50 W h L<SUP>−1</SUP> at a 10C rate (0.5 kW L<SUP>−1</SUP>), with less than 1% capacity loss over 500 cycles. A large-area (>6 cm<SUP>2</SUP>) 4-cell stack is built to illustrate that the pouch cells are scalable to practical dimensions and stackable without sacrificing performance. The device operates in the range of 6-7 V and has an internal self-balancing mechanism that prevents any individual cell in the stack from overcharging. The results thus demonstrate both a conceptually new cell architecture that is broadly applicable to many aqueous electrolyte chemistries and a specific high-performance example thereof.</P>
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Baik, Jeong Min,Zielke, Mark,Kim, Myung Hwa,Turner, Kimberly L.,Wodtke, Alec M.,Moskovits, Martin American Chemical Society 2010 ACS NANO Vol.4 No.6
<P>An electronic nose (e-nose) strategy is described based on SnO<SUB>2</SUB> nanowire arrays whose sensing properties are modified by changing their operating temperatures and by decorating some of the nanowires with metallic nanoparticles. Since the catalytic processes occurring on the metal nanoparticles depend on the identity of the metal, decorating the semiconducting nanowires with various metal nanoparticles is akin to functionalizing them with chemically specific moieties. Other than the synthesis of the nanowires, all other steps in the fabrication of the e-nose sensors were carried out using top-down microfabrication processes, paving the way to a useful strategy for making low cost, nanowire-based e-nose chips. The sensors were tested for their ability to distinguish three reducing gases (H<SUB>2</SUB>, CO, and ethylene), which they were able to do unequivocally when the data was classified using linear discriminant analysis. The discriminating ability of this e-nose design was not impacted by the lengths or diameters of the nanowires used.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-6/nn100394a/production/images/medium/nn-2010-00394a_0007.gif'></P>
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Kim, Nam Hoon,Hwang, Wooseup,Baek, Kangkyun,Rohman, Md. Rumum,Kim, Jeehong,Kim, Hyun Woo,Mun, Jungho,Lee, So Young,Yun, Gyeongwon,Murray, James,Ha, Ji Won,Rho, Junsuk,Moskovits, Martin,Kim, Kimoon American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.13
<P>Single-molecule surface-enhanced Raman spectroscopy (SERS) offers new opportunities for exploring the complex chemical and biological processes that cannot be easily probed using ensemble techniques. However, the ability to place the single molecule of interest reliably within a hot spot, to enable its analysis at the single-molecule level, remains challenging. Here we describe a novel strategy for locating and securing a single target analyte in a SERS hot spot at a plasmonic nanojunction. The “smart” hot spot was generated by employing a thiol-functionalized cucurbit[6]uril (CB[6]) as a molecular spacer linking a silver nanoparticle to a metal substrate. This approach also permits one to study molecules chemically reluctant to enter the hot spot, by conjugating them to a moiety, such as spermine, that has a high affinity for CB[6]. The hot spot can accommodate at most a few, and often only a single, analyte molecule. Bianalyte experiments revealed that one can reproducibly treat the SERS substrate such that 96% of the hot spots contain a single analyte molecule. Furthermore, by utilizing a series of molecules each consisting of spermine bound to perylene bisimide, a bright SERS molecule, with polymethylene linkers of varying lengths, the SERS intensity as a function of distance from the center of the hot spot could be measured. The SERS enhancement was found to decrease as 1 over the square of the distance from the center of the hot spot, and the single-molecule SERS cross sections were found to increase with AgNP diameter.</P> [FIG OMISSION]</BR>
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