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Antibacterial Activity of Ordered Gold Nanorod Arrays
Zhu, Yuejing,Ramasamy, Mohankandhasamy,Yi, Dong Kee American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.17
<P>Well-packed two- and three-dimensional (2D and 3D) gold nanorod (AuNR) arrays were fabricated using confined convective arraying techniques. The array density could be controlled by changing the concentration of the gold nanorods solution, the velocity of the moving substrate, and the environment air-temperature. The hydrophilic behavior of glass substrates before and after surface modification was studied through contact angle measurements. The affinity and alignment of the AuNR arrays with varying nanorod concentrations and the resulting different array densities were studied using field emission scanning electron microscopy (FE-SEM). Under stable laser intensity irradiation, the photothermal response of the prepared arrays was measured using a thermocouple and the results were analyzed quantitatively. Synthesized AuNR arrays were added to <I>Escherichia coli</I> (<I>E. coli</I>) suspensions and evaluated for photothermal bactericidal activity before and after laser irradiation. The results showed promising bactericidal effect. The severity of pathogen destruction was measured and quantified using fluorescence microscopy, bioatomic force microscopy (Bio-AFM) and flow cytometry techniques. These results indicated that the fabricated AuNR arrays at higher concentrations were highly capable of complete bacterial destruction by photothermal effect compared to the low concentration AuNR arrays. Subsequent laser irradiation of the AuNR arrays resulted in rapid photoheating with remarkable bactericidal activity, which could be used for water treatment to produce microbe-free water.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-17/am503153v/production/images/medium/am-2014-03153v_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503153v'>ACS Electronic Supporting Info</A></P>
이혁재,Jun-Ho Shin,Jisu Chae,Jung Bin Kim,김태희,박경봉 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.3
A ZnO seed layer is prepared from ZnO sol under various heating conditions, whose effect on the growth of ZnO nanorod arrays for the photoanode in dye-sensitized solar cells (DSSCs) is systematically investigated. Differential thermal analysis and x-ray diffraction investigation show that a pre-calcination temperature of at least 250°C is needed for the crystallization of the ZnO seed layer. Extreme preferential orientation along the (002) plane is also observed at 250°C. The post-annealing temperature governs the diameter and length of the vertically grown ZnO nanorod arrays. The diameter and length of the ZnO nanorod arrays increase till the post-annealing temperature reaches 500°C. At 600°C, the ZnO nanorod becomes shorter than that at 500°C. The longer and well-aligned ZnO nanorod arrays yield better photovoltaic performance. The optimum heating conditions to obtain the best conversion efficiency of DSSCs are found to be pre-calcination at 250°C and post-annealing at 500°C.
최승요,박현웅 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A stand-alone photoelectrochemical cell composed of electrocatalytic H<sub>2</sub>O<sub>2</sub> production using carbon electrode and hydrogen-treated TiO<sub>2</sub> nanorod (h-TNR) arrays catalyzing the oxidation of As(III) to As(V) under simulated solar light. Loading CNT onto carbon paper enhances the catalytic performance and the Faradaic efficiency (FE) approaches ~100%. To drive the HPR, the 2-electron oxidation of As(III) to As(V) that accompanies the production of the proton/electron couples is achieved at an FE of >80% using the h-TNR arrays. The electrodes pair maintained high FE for both anodic and cathodic reaction over 10 h. In the case of PV-cell coupling, electrodes pair successfully drives the standalone operation of both reactions at the high FEs (>90%). <sup>**</sup> This research was supported by the Basic Science Research Program (2019R1A2C2002602 and 2018R1A6A1A03024962) and the Technology Development Program to Solve Climate Changes (2019M1A2A2065616) through the National Research Foundation, Korea.
Oh, Myoung-Kyu,Shin, Yong-Seok,Lee, Chang-Lyoul,De, Ranjit,Kang, Hoonsoo,Yu, Nan Ei,Kim, Bok Hyeon,Kim, Joon Heon,Yang, Jin-Kyu Springer US 2015 NANOSCALE RESEARCH LETTERS Vol.10 No.1
<P>Aligned silver nanorod (AgNR) array films were fabricated by oblique thermal evaporation. The substrate temperature during evaporation was varied from 10 to 100 °C using a home-built water cooling system. Deposition angle and substrate temperature were found to be the most important parameters for the morphology of fabricated films. Especially, it was found that there exists a critical temperature at ~90 °C for the formation of the AgNR array. The highest enhancement factor of the surface-enhanced Raman scattering (SERS), observed in the Ag films coated with benzenethiol monolayer, was ~6 × 10<SUP>7</SUP>. Hot spots, excited in narrow gaps between nanorods, were attributed to the huge enhancement factor by our finite-difference time-domain (FDTD) simulation reflecting the real morphology.</P>
Ko, Yeong Hwan,Nagaraju, Goli,Yu, Jae Su Springer US 2015 NANOSCALE RESEARCH LETTERS Vol.10 No.1
<P>Vertically aligned ZnO nanorod array (NRA)-based ultraviolet (UV) photodetectors (PDs) were successfully fabricated and optimized via a facile hydrothermal process. Using a shadow mask technique, the thin ZnO seed layer was deposited between the patterned Au/Ti electrodes to bridge the electrodes. Thus, both the Au electrodes could be connected by the ZnO seed layer. As the sample was immersed into growth solution and heated at 90 °C, the ZnO NRAs were crystallized and vertically grown on the ZnO seed layer, thus creating a metal-semiconductor-metal PD structure. To investigate the size effect of ZnO NRAs on photocurrent, the PDs were readily prepared with different concentrations of growth solution. For the ZnO NRAs grown at 25 mM of concentration, the PD with 10 μm of channel width (i.e., gap distance between two electrodes) exhibited a high photocurrent of 1.91 × 10<SUP>−4</SUP> A at an applied bias of 10 V under 365 nm of UV light illumination. The PD was optimized by adjusting the channel width. For 15 μm of channel width, a relatively high photocurrent on-off ratio of 37.4 and good current transient characteristics were observed at the same applied bias. These results are expected to be useful for cost-effective and practical UV PD applications.</P>
Kang, P.G.,Lee, T.K.,Ahn, C.W.,Kim, I.W.,Lee, H.H.,Choi, S.B.,Sung, K.D.,Jung, J.H. Elsevier 2015 Nano energy Vol.17 No.-
Vertical alignment of one-dimensional piezoelectric/ferroelectric materials is highly required to take full advantage of their unique electrical and optical properties for various applications. Here, we report the piezoelectric nanogenerator (NG) and second harmonic generator (SHG) applications of a vertically aligned single-crystalline KNbO<SUB>3</SUB> (KNO) nanorod (NR) array on a conducting Nb:SrTiO<SUB>3</SUB> substrate. A simple, cost-effective hydrothermal method at low temperature enables growth of ultra-long orthorhombic KNO NR array with a high piezoelectric coefficient. A corona-poled KNO NR array-based NG generates stable piezoelectric power under the compressive force. The open-circuit voltage and closed-circuit current almost linearly increase. In addition, the KNO NR array emits bright and sharp red, green, and blue visible light under the shining of infrared light. The SHG intensity is strongest along the KNO NR direction and weakest perpendicular to the NR direction. These results imply that the vertically aligned KNO NR array could be useful for an environment-friendly pressure sensor and a full-color display application.
Choi, Seung Yo,Kim, Seonghun,Lee, Kyung Jin,Kim, Jin Young,Han, Dong Suk,Park, Hyunwoong Elsevier 2019 Applied Catalysis B Vol.252 No.-
<P><B>Abstract</B></P> <P>We present an off-grid, standalone electrocatalytic H<SUB>2</SUB>O<SUB>2</SUB> production reaction (HPR) using carbon nanotubes (CNT) wired to hydrogen-treated TiO<SUB>2</SUB> nanorod (h-TNR) arrays catalyzing the oxidation of As(III) to As(V) under simulated solar light (AM 1.5; 100 mW cm<SUP>−2</SUP>). Loading CNT onto acid-treated carbon paper (a-CP) significantly enhances the catalytic 2-electron transfer to O<SUB>2</SUB>, leading to a Faradaic efficiency (FE) of ∼100% for the HPR. To drive the HPR, the 2-electron oxidation of toxic As(III) to less toxic As(V) that accompanies the production of the proton/electron couples is achieved at an FE of >80% using the h-TNR arrays. The high FEs of the anodic and cathodic reactions are maintained over 10 h when a direct-current voltage of 0.7 V is applied to the h-TNR photoanode and CNT/a-CP cathode pair. The coupling of a mono-Si photovoltaic array that is one-tenth the size of h-TNR photoanode to the pair of h-TNR and CNT/a-CP successfully drives the standalone operation of both reactions at the high FEs (>90%). The surface characterization of the as-synthesized materials and the reaction mechanism are discussed in detail.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The loading of CNT into acid-treated carbon papers enhances the 2e-transfer process. </LI> <LI> The Faradaic efficiency for H<SUB>2</SUB>O<SUB>2</SUB> production using CNT/a-CP cathodes is ˜100. </LI> <LI> The Faradaic efficiency for As(III) oxidation using h-TNR photoanodes is >80%. </LI> <LI> The h-TNR and CNT/a-CP pair drives the As(III) oxidation and H<SUB>2</SUB>O<SUB>2</SUB> production. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>