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Lee, Sanghee,Eun, Jakyung,Jeon, Sangmin Elsevier 2020 Nano energy Vol.68 No.-
<P><B>Abstract</B></P> <P>A porous cellulose nanofiber (CNF) substrate was prepared by drying a TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl radical)-treated bleached pulp solution in a vacuum freeze dryer. A graphitic carbon layer (GCL) was fabricated directly onto the CNF substrate using infrared laser irradiation at ambient conditions. By focusing the laser beam on the top surface of the CNF substrate, higher conversion of the CNF to GCL was achieved on the top surface than the bottom surface. An oxygen-to-carbon ratio (O/C) gradient was established between the top and bottom surfaces during laser induced graphitization (LIG), as the O/C of the GCL decreased with laser intensity. When the GCL with the O/C gradient was exposed to water vapor, hydrolysis of the carboxyl groups in the GCL produced hydrogen ions. The resulting hydrogen ion concentration gradient between the top and bottom surfaces created electricity. At 82% relative humidity, the voltage and current outputs from a 3 × 3 mm<SUP>2</SUP> GCL were 0.83 V and 5.93 μA/cm<SUP>2</SUP>, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Laser induced graphitization was used to produce graphitic carbon layers. </LI> <LI> The high gradient of oxygen-containing functional groups and the short diffusion path enabled high power generation. </LI> <LI> The voltage output from a 3 × 3 mm<SUP>2</SUP> GCL was 0.83 V at 82% relative humidity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A concept of stretchable coaxial cable based on one-body Au nanonetworks
Juhyeon Kim,Byeunggon Kim,Jakyung Eun,Beom-Jin Yoon,Sangmin Jeon,Yun Seon Do,Soo-Hwan Jeong 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Recently, the demand for wearable electronics has sharply been increasing for diverse purposes. For theentire system to process enormous data simultaneously between the devices, the importance of stretchableinterconnects with large bandwidth has been emphasized. However, achieving an appropriate attenuationlevel as well as stable transmission performance against elongation is still challenging. This reportsuggests the stretchable coaxial cable based on the one-body metal network, which is intrinsicallystretchable and highly conductive. By multiple wrapping of the one-body metal network, excellent connectivityand electrical conductivity were realized. Its sheet resistance reached as low as that of the solidcylindrical metal. The low-loss cable was obtained through a simple fabrication procedure; its attenuationat 1 GHz remained under 0.011 and 0.033 dB/mm against 0% and 20% elongation, respectively. Also, it only experienced an insignificant change of the attenuation level (3.0%) during 100 stretching/releasing cycles, implying its feasibility of the dynamic connections in prospective applications.