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Tenggara, Ayodya Pradhipta,Park, S J,Yudistira, Hadi Teguh,Ahn, Y H,Byun, Doyoung IOP 2017 Journal of micromechanics and microengineering Vol.27 No.3
<P>We demonstrated the fabrication of terahertz metamaterial sensor for the accurate and on-site detection of yeast using electrohydrodynamic jet printing, which is inexpensive, simple, and environmentally friendly. The very small sized pattern up to 5 <I>µ</I>m-width of electrical split ring resonator unit structures could be printed on a large area on both a rigid substrate and flexible substrate, i.e. silicon wafer and polyimide film using the drop on demand technique to eject liquid ink containing silver nanoparticles. Experimental characterization and simulation were performed to study their performances in detecting yeast of different weights. It was shown that the metamaterial sensor fabricated on a flexible polyimide film had higher sensitivity by more than six times than the metamaterial sensor fabricated on a silicon wafer, due to the low refractive index of the PI substrate and due to the extremely thin substrate thickness which lowers the effective index further. The resonance frequency shift saturated when the yeast weights were 145 <I>µ</I>g and 215 <I>µ</I>g for metamaterial structures with gap size 6.5 <I>µ</I>m fabricated on the silicon substrate and on the polyimide substrate, respectively.</P>
High Aspect Ratio Conductive Lines Fabricated by Electrohydrodynamic (EHD) Jet Printing
Ayodya Pradhipta Tenggara,Yonghee Jang,Hyowon Tak,Hadi Teguh Yudistira,Vu Dat Nguyen,Doyoung Byun 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Fabricating high-density integrated circuits require three dimensional electrode lines with high aspect-ratio. Nowadays, many electrode lines for electronic circuits are fabricated by printing technologies to give simple and environmental friendly fabrication technique. However, most applications of printing technologies are in two dimensional structures. In this study, we propose printing technology to fabricate three dimensional electrode lines. Electrohydrodynamic (EHD) jet printing with printing speed up to 800 mm/s was used to make three dimensional electrode lines with aspect ratio greater than 5 by using multiple printing methods. Two kinds of NPK silver inks with viscosity 5000 and 8000 cP were used. Parametric studies were done to observe the effect of printing parameters, i.e. printing numbers and printing speed into the aspect ratio of the lines. The results showed that increasing printing numbers and printing speed could increase the aspect ratio of lines. The high aspect ratio lines conducted by this study have great potential to improve efficiency of solar cells.
Janneh, M.,De Marcellis, A.,Palange, E.,Tenggara, A.T.,Byun, D. Elsevier 2018 OPTICS COMMUNICATIONS - Vol.416 No.-
<P><B>Abstract</B></P> <P>We report on a novel very high Q -factor dual-band Terahertz perfect absorber composed of a metasurface located on top of a flexible polyimide spacer deposited on a silver ground layer. The metasurface is a 2D-array of plasmonic nanoantennas with the shape of two concentric square rings and a cylinder positioned at their centre. By performing numerical simulations, we studied the polarisation insensitive electromagnetic response of the absorber for incident angles varying from 0° up to ± 30°. The two resonant modes centred at <SUB> f 1 </SUB> = 1 .80 THz and <SUB> f 2 </SUB> = 2 .26 THz have Q -factors Q ( <SUB> f 1 </SUB> ) = 120 and Q ( <SUB> f 2 </SUB> ) = 94 and absorption coefficients A ( <SUB> f 1 </SUB> ) = 99 . 8 % and A ( <SUB> f 2 </SUB> ) = 99 . 6 %. Moreover, we investigated how the resonant mode frequencies change with the refractive index and thickness of transparent analytes adsorbed on the metasurface. In terms of the Refractive Index Units (RIU), we obtained sensitivities equal to 187.5 GHz/RIU and 360 GHz/RIU for the <SUB> f 1 </SUB> and <SUB> f 2 </SUB> resonance frequencies, respectively, and figure of merits up to FOM = 19 . 1 and <SUP> FOM ∗ </SUP> = 431 . These results make the dual-band absorber to be employed as a sensing device able to detect the presence and/or the physical/chemical modifications of the adsorbed analytes. Moreover, we investigated the dependence of the sensitivity as a function of slight modifications of the metasurface nanoantenna shape, demonstrating that a more homogeneous distribution of the electric field intensity on the metasurface improves the sensitivity of the absorber without affecting the Q -factors.</P>
Jafry, Ali Turab,Lee, Hyungdong,Tenggara, Ayodya Pradhipta,Lim, Hosub,Moon, Youngkwang,Kim, Seung-Hyun,Lee, Yongwoo,Kim, Sung-Min,Park, Sungsu,Byun, Doyoung,Lee, Jinkee Elsevier 2019 Sensors and actuators. B Chemical Vol.282 No.-
<P><B>Abstract</B></P> <P>Double-sided electrohydrodynamic jet printing of circuitry using silver nanowires (AgNWs) and dispensing of high viscosity silver nanoparticles (AgNPs) is demonstrated for the first time in the fabrication of a two-dimensional array of electrodes (3D circuitry) on a single sheet of paper. The penetration of AgNW ink through the paper’s thickness by capillary imbibition allows for multilayer electrical access to connect the individual electrodes. This makes it an automated and efficient choice as the functional area of the device is conserved and the surface of the paper is preserved. This allows for two-dimensional droplet manipulation on a paper-based digital microfluidics (PBDMF) platform. Compared to printed circuit board technology, paper-based electronics offer a range of desirable properties: they are light weight, portable, economical, flexible, biodegradable, and the materials are abundantly available. The fabricated PBDMF chip is demonstrated to be a low-cost, fully reconfigurable, and disposable point-of-care diagnostic platform for the environmental sensing of pesticide using organophosphorus hydrolase enzyme through colorimetric detection via smartphone.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Silver nanowires penetrated through paper’s thickness for making 3D interconnects. </LI> <LI> High viscosity silver nanoparticles dispensed on paper reveal no penetration. </LI> <LI> 3D circuitry in single sheet of paper printed using double-sided EHD jet printing. </LI> <LI> Two-dimensional droplet actuation achieved on a paper-based digital microfluidics. </LI> <LI> Cellphone-based colorimetric detection of methyl paraoxon from 10 to 100 μM concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Drop on Demand 전기수력학적 젯 프린팅의 라인 안정성 연구
명재범(Jaebeom Myeong),Hadi Teguh Yudistira,Ayodya Pradhipta Tenggara,변도영(Doyoung Byun) 한국가시화정보학회 2016 한국가시화정보학회 학술발표대회 논문집 Vol.2016 No.12
Studying the behaviours of droplets deposited by Electrohydrodynamic (EHD) jet printing becomes important because its unique property which can eject a much smaller volume of droplets than the volume of ejected droplets obtained by other conventional inkjet printing technologies. In this research, the stability of printed line deposited by droplet-on-demand (DoD) Electrohydrodynamics (EHD) jet-printing was investigated using silver nanoparticle ink. By varying the distance of drops, four modes of printed results could be obtained: isolated dot, pair’s dot, line and bulging line. To investigate the mechanism of bulging and drop coalescence phenomena, the effect of droplet volume and the overlapping ratio of drops were investigated in two different substrates, i.e. conductive substrate (Si) and the dielectric substrate (glass) were used. The results of this research can give direction to make high resolution conductive pattern using EHD jet printing in electronic and photonic devices.