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Lee, Jinwoo,Lee, Jaehak,Kwon, Jinhyeong,Lee, Habeom,Eom, Hyeonjin,Yoon, Yeosang,Ha, Inho,Yang, Minyang,Ko, Seung Hwan American Chemical Society 2017 Langmuir Vol.33 No.8
<P>Controlling the surface morphology of the electrode on the nanoscale has been studied extensively because the surface morphology of a material directly leads to the functionalization in various fields of studies. In this study, we designed a simple and cost-effective method to fine-tune the surface morphology and create controlled nanopores on the silver electrode by utilizing 2-ethoxyethanol and two successive heat treatments. High electrical conductivity and mechanical robustness of nanoporous silver corroborate its prospect to be employed in various applications requiring a certain degree of flexibility. As a proof-of-concept, a high-performance supercapacitor was fabricated by electrodepositing MnO2. This method is expected to be useful in various electronic applications as well as energy storage devices.</P>
Lee, Habeom,Hong, Sukjoon,Kwon, Jinhyeong,Suh, Young D.,Lee, Jinhwan,Moon, Hyunjin,Yeo, Junyeob,Ko, Seung Hwan The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.16
<▼1><P>A flexible all-solid-state supercapacitor was demonstrated with a flexible Ag nanoparticle current collector prepared by an R2R printed and laser annealing process.</P></▼1><▼2><P>A flexible all-solid-state supercapacitor was demonstrated with a flexible Ag nanoparticle current collector which is prepared by a roll-to-roll (R2R) gravure printing process combined with a fast, low temperature laser annealing process. The laser annealing could yield good electrical conductivity of the printed Ag nanoparticle (NP) very rapidly without any noticeable polymer substrate damage and with outstanding adhesion to the underlying polymer substrate which is essential for the fabrication of stable energy devices. The laser annealed Ag NP films are subsequently sandwiched with a carbon slurry and a polymer layer as the active material and the electrolyte to assemble flexible all solid-state supercapacitors that can be bent up to 135° without any severe decrease of the electrochemical performance. By combining the proposed laser process with the existing R2R system, we expect that the printing process for flexible electronic devices could be greatly improved in terms of processing time and space.</P></▼2>
Lee, Habeom,Manorotkul, Wanit,Lee, Jinhwan,Kwon, Jinhyeong,Suh, Young Duk,Paeng, Dongwoo,Grigoropoulos, Costas P.,Han, Seungyong,Hong, Sukjoon,Yeo, Junyeob,Ko, Seung Hwan American Chemical Society 2017 ACS NANO Vol.11 No.12
<P>Exploration of the electronics solely composed of bottom-up synthesized nanowires has been largely limited due to the complex multistep integration of diverse nanowires. We report a single-step, selective, direct, and on-demand laser synthesis of a hierarchical heterogeneous nanowire-on-nanowire structure (secondary nanowire on the primary backbone nanowire) without using any conventional photolithography or vacuum deposition. The highly confined temperature rise by laser irradiation on the primary backbone metallic nanowire generates a highly localized nanoscale temperature field and photothermal reaction to selectively grow secondary branch nanowires along the backbone nanowire. As a proof-of-concept for an all-nanowire electronics demonstration, an all-nanowire UV sensor was successfully fabricated without using conventional fabrication processes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-12/acsnano.7b06098/production/images/medium/nn-2017-06098z_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b06098'>ACS Electronic Supporting Info</A></P>
Lee, Habeom,Hong, Sukjoon,Lee, Jinhwan,Suh, Young Duk,Kwon, Jinhyeong,Moon, Hyunjin,Kim, Hyeonseok,Yeo, Junyeob,Ko, Seung Hwan American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.24
<P>Stretchable and transparent electronics have steadily attracted huge attention in wearable devices. Although Ag nanowire is the one of the most promising candidates for transparent and stretchable electronics, its electrochemical instability has forbidden its application to the development of electrochemical energy devices such as supercapacitors. Here, we introduce a highly stretchable and transparent super capacitor based on electrochemically stable Ag Au core shell nanowire percolation network electrode. We developed a simple solution process to synthesize the Ag Au core shell nanowire with excellent electrical conductivity as well as greatly enhanced chemical and electrochemical stabilities compared to pristine Ag nanowire. The proposed core shell nanowirebased supercapacitor still possesses fine optical transmittance and outstanding mechanical stability up to 60% strain. The Ag Au core shell nanowire can be a strong candidate for future wearable electrochemical energy devices.</P>
Lee, Habeom,Yeo, Junyeob,Lee, Jinhwan,Cho, Hyunmin,Kwon, Jinhyeong,Han, Seungyong,Kim, Sangwan,Hong, Sukjoon,Ko, Seung Hwan American Chemical Society 2017 The Journal of Physical Chemistry Part C Vol.121 No.40
<P>The development of hydrothermal growth enabled facile growth of ZnO nanowire over a large area at mild environments, yet its usage in actual electronic devices has been restricted due to poor spatial selectivity in the growth and a difficulty in the integration to other components. We introduce a local thermochemical growth of ZnO nanowire branches on Ag nanowire backbone percolation networks by electrical current induced local resistive heating in liquid environment for easy fabrication of metal semiconductor hierarchical nanowire structure. Through vacuum filtration transfer and laser ablation process, patterned conductive network composed of ZnO nanoparticle functionalized Ag nanowire percolation network was prepared as a conductive network for localized resistive heating. Upon the application of proper bias voltage, highly localized temperature field was generated in the vicinity of the patterned Ag nanowire network heater to induce the selective growth of ZnO nanowire from the Ag nanowire backbone. As the temperature rise is related to the electrical current flow, ZnO nanowire was selectively synthesized at the area subject to the maximum current density, which was defined by the laser ablation technique. It was further confirmed that the characteristics of grown ZnO nanowires could be controlled by changing the growth condition.</P>
Hong, Sukjoon,Yeo, Junyeob,Lee, Jinhwan,Lee, Habeom,Lee, Phillip,Lee, Seung S,Ko, Seung Hwan American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.3
<P>We introduce a facile method to enhance the functionality of a patterned metallic transparent conductor through selective laser ablation of metal nanowire percolation network. By scanning focused nanosecond pulsed laser on silver nanowire percolation network, silver nanowires are selectively ablated and patterned without using any conventional chemical etching or photolithography steps. Various arbitrary patterns of silver nanowire transparent conductors are readily created on the percolation network by changing various laser parameters such as repetition rate and power. The macroscopic optical and electrical properties of the percolation network transparent conductor can be easily tuned by changing the conductor pattern design via digital selective laser ablation. Further investigation on the silver nanowire based electrode line prepared by the ablation process substantiates that the general relation for a conducting thin film fails at a narrow width, which should be considered for the applications that requires a high resolution patterns. Finally, as a proof of concept, a capacitive touch sensor with diamond patterns has been demonstrated by selective laser ablation of metal nanowire percolation network.</P>
Recent progress in silver nanowire based flexible/wearable optoelectronics
Kwon, Jinhyeong,Suh, Young D.,Lee, Jinhwan,Lee, Phillip,Han, Seungyong,Hong, Sukjoon,Yeo, Junyeob,Lee, Habeom,Ko, Seung Hwan The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.28
<P>Among diverse nanomaterials, silver nanowire (AgNW) has reached a certain level of technological maturity, and numerous commercialized AgNW products are already on the market for research and prototype purposes. One of the potential applications for AgNW and its percolative form is in wearable electronics, owing to the superior electrical, optical and mechanical properties that arise from the material itself or the overall interconnected structure. For successful application towards wearable applications, constituent AgNWs should first have uniform and controllable properties. At the same time, it is preferential to develop relevant scalable fabrication processes, together with the verification of potential applications from a proof-of-concept standpoint. Based on these progresses, we summarize the recent developments in AgNW based flexible/wearable optoelectronic applications and foresee their future development.</P>
Hong, Sukjoon,Yeo, Junyeob,Kim, Gunho,Kim, Dongkyu,Lee, Habeom,Kwon, Jinhyeong,Lee, Hyungman,Lee, Phillip,Ko, Seung Hwan American Chemical Society 2013 ACS NANO Vol.7 No.6
<P>We introduce a facile approach to fabricate a metallic grid transparent conductor on a flexible substrate using selective laser sintering of metal nanoparticle ink. The metallic grid transparent conductors with high transmittance (>85%) and low sheet resistance (30 Ω/sq) are readily produced on glass and polymer substrates at large scale without any vacuum or high-temperature environment. Being a maskless direct writing method, the shape and the parameters of the grid can be easily changed by CAD data. The resultant metallic grid also showed a superior stability in terms of adhesion and bending. This transparent conductor is further applied to the touch screen panel, and it is confirmed that the final device operates firmly under continuous mechanical stress.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-6/nn400432z/production/images/medium/nn-2013-00432z_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn400432z'>ACS Electronic Supporting Info</A></P>