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RISS 인기검색어
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- 저자 : Nghia Dinh Huynh (검색결과 5 건)
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Effect on TENG Performance by Phase Control of TiOx Nanoparticles
Nghia Dinh Huynh,박현우,정권범,최덕현 한국복합재료학회 2018 Composites research Vol.31 No.6
One of the critical parameters to improve the output power for triboelectric nanogenerators (TENGs) is the surface charge density. In this work, we modify the tribo-material of TENG by introducing the TiOx embedded Polydimethylsiloxane (PDMS) in anatase and rutile phase. The effect of dielectric constant and electronic structure of the TiOx on the capacitance of TENG and the output power as well are discussed. The surface charge density is increased as the control of the dielectric constant in difference weight percent of TiOx and PDMS. As the results of that, the 5% TiOx rutile phase and 7% TiOx anatase phase embedded PDMS exhibit the highest TENG output. The peak value of voltage/current obtained from TiOx rutile and anatase phase are ~180 V/8.2 μA and 211.6 V/8.7 μA, respectively, at the external force of 5 N and working frequency of 5 Hz, which gives over 12-fold and 15-fold power enhancement compared with the TENG based on the pristine PDMS film. This study provides a better understanding for TENG performance enhancement from the materials view.
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Dudem, Bhaskar,Huynh, Nghia Dinh,Kim, Wook,Kim, Dong Hyun,Hwang, Hee Jae,Choi, Dukhyun,Yu, Jae Su Elsevier 2017 Nano energy Vol.42 No.-
<P><B>Abstract</B></P> <P>Triboelectric nanogenerator (TENG) is an up-and-coming technology that functions based on the triboelectrification and electrostatic induction to generate the electricity from various mechanical energy sources. However, the practical applications still demand a significant improvement of the TENG output performance, so the optimization of key factors such as triboelectric material selectivity, nanostructure-like morphology, and surface contact area is very crucial. Here, we reported a TENG based on nanopillar-array architectured polydimethylsiloxane (NpA-PDMS) layers with simple and cost-effective fabrication process, high output performance, and long-term stability. We mainly focused on improving the output performance of TENG by optimizing the structural dimensions of nanopillar architectures (NpAs) distributed on the surface of PDMS. The effect of output performance of TENG by varying the period and diameter of NpAs on the surface of PDMS was theoretically and experimentally investigated. For theoretical study, we considered the NpA-PDMS as a viscoelastic material. From this simulation, we calculated the contact stress for NpA-PDMS layers and compared the behaviors by considering the contact area and stress together (i.e., the product of contact area and stress, called as a contact force). Surprisingly, the calculated results were well matched with the experimental data. And, an optimal NpA-PDMS with the period and diameter of 125nm and 60nm, respectively, was formed. Thus, the TENG with the optimal NpA-PDMS exhibited the open-circuit voltage (<I>V</I> <SUB>OC</SUB>) and short-circuit current (<I>I</I> <SUB>SC</SUB>) values of ~ 568V and ~ 25.6μA, respectively, under 10N of pushing force and 5Hz of pushing frequency. Additionally, the enduringness test of the TENG device was also conducted to confirm its mechanical stability and durability. Finally, for a real application, the optimized TENG device was incorporated with a windmill system to effectively harvest the wind energy available in indoor and outdoor environments. This windmill system effectively harvested the wind energy, exhibiting the <I>V</I> <SUB>OC</SUB> and <I>I</I> <SUB>SC</SUB> values of ~ 200V and ~ 24µA, respectively, at the wind speed of 14–15m/s.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We propose TENGs based on NpA-PDMS layers. </LI> <LI> The output performance of TENG by varying the structural dimensions of NpAs-PDMS was investigated. </LI> <LI> The optimum dimension of surface structure was determined by effective contact force. </LI> <LI> The TENG was incorporated with the windmill system to effectively harvest wind energy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Electron blocking layer-based interfacial design for highly-enhanced triboelectric nanogenerators
Park, Hyun-Woo,Huynh, Nghia Dinh,Kim, Wook,Lee, Choongyeop,Nam, Youngsuk,Lee, Sangmin,Chung, Kwun-Bum,Choi, Dukhyun Elsevier 2018 Nano energy Vol.50 No.-
<P><B>Abstract</B></P> <P>The key to enhance the output power from triboelectric nanogenerators (TENGs) is to control the surface charge density of tribo-materials. In this study, we introduce an electron blocking layer (EBL) between a negative tribo-material and an electrode to dramatically enhance the output power of TENGs. For the first time, we suggest that the tribo-potential can be significantly reduced by the presence of interfacial electrons; electrostatically induced positive charges at the interface beneath a negative tribo-material can be screened out by the electrons, thereby decreasing the surface charge density. By employing an EBL between a negative tribo-material and an electrode, we can maintain a high surface charge density at the surface of the negative tribo-material. Furthermore, an EBL with high permittivity can enhance the polarization of the tribo-material, resulting in an improved surface charge density. As a proof of concept, polydimethylsiloxane (PDMS) and aluminum (Al) are used as a negative tribo-material and an electrode, respectively. A TiO<SUB>x</SUB> EBL is then deposited in between these materials by radio frequency (RF) sputtering. Due to the coupling effects of the electron blocking and enhanced polarization, the output peak power from the TENG with a TiO<SUB>x</SUB> EBL reaches approximately 2.5 mW at 3 Hz and 5 N, which is 25 times larger than that of a TENG without an EBL. To understand the improved behavior of the TENG with a TiO<SUB>x</SUB> EBL, we investigate the correlations between the output behavior of the TENG and the physical properties of the surface/interface of TiO<SUB>x</SUB> and PDMS (e.g., the surface potential, dielectric properties, and electronic structures). We expect that our results can provide a novel design way to significantly improve the output performance of TENGs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We first report the critical effects of an electron blocking layer (EBL) to significantly enhance TENG performance. </LI> <LI> A high surface charge density of tribo-material by electron blocking property of an EBL. </LI> <LI> An EBL with high permittivity can enhance the polarization of the tribo-material. </LI> <LI> An improved surface charge density and contributing to the enhanced performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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