http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yang, Daejong,Fuadi, M. Kasyful,Kang, Kyungnam,Kim, Donghwan,Li, Zhiyong,Park, Inkyu American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.19
<P>A novel method for the selective and localized synthesis of nanomaterials and their in situ integration based on serial combination of localized liquid-phase reaction has been developed for the fabrication of heterogeneous nanomaterial array. This method provides simple, fast and cost-effective fabrication process by using well-controlled thermal energy and therefore solves the challenging problems of assembly and integration of heterogeneous nanomaterial array in functional microelectronic devices. We have fabricated a parallel array of TiO<SUB>2</SUB> nanotubes, CuO nanospikes, and ZnO nanowires, which exhibited adequate gas sensing response. Furthermore, we could approximately determine individual gas concentrations in a mixture gas consisting of 0–2 ppm of NO<SUB>2</SUB> and 0–800 ppm of CO gas species by analyzing multiple data from an array of heterogeneous sensing nanomaterials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-19/acsami.5b00110/production/images/medium/am-2015-001104_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00110'>ACS Electronic Supporting Info</A></P>
Yang, Daejong,Lee, Jaehwan,Kim, Donghwan,Cho, Incheol,Ok, Jong G.,Park, Inkyu American Chemical Society 2018 Langmuir Vol.34 No.14
<P>We report ZnO nanowire- and TiO<SUB>2</SUB> nanotube-based light sensors on flexible polymer substrates fabricated by localized hydrothermal synthesis and liquid phase deposition (LPD). This method realized simple and cost-effective in situ synthesis and integration of one-dimensional ZnO and TiO<SUB>2</SUB> nanomaterials. The fabricated sensor devices with ZnO nanowires and TiO<SUB>2</SUB> nanotubes show very high sensitivity and quick response to the ultraviolet (UV) and ambient light, respectively. In addition, our direct synthesis and integration method result in mechanical robustness under external loading such as static and cyclic bending because of the strong bonding between the nanomaterial and the electrode. By controlling the reaction time of the LPD process, the Ti/Zn ratio could be simply modulated and the spectral sensitivity to the light in the UV to visible range could be controlled.</P> [FIG OMISSION]</BR>
Yang Sungyu,Kim Wook-jin,Park Inkyu,Yoe Sang-min,Moon Byeong-cheol 한약정보연구회 2016 한약정보연구회지 Vol.4 No.3
The complete chloroplast genome (cpDNA) sequence of Aconitum volubile var. pubescens, an important and popular traditional medicinal plant species for Aconiti Kusnezoffii Tuber, is determined in this study. The cpDNA of A. volubile var. pubescens was 155,872 bp in length with 38.12% GC content that composed an 86,348 bp large single-copy (LSC), a 16,944 bp small single-copy (SSC), and a pair of 26,290 bp inverted repeats (IRA and IRB). The cpDNA of A. volubile var. pubescens encodes 131 predicted unique genes including 86 protein-encoding (CDS) genes, 8 ribosomal RNA (rRNA) genes and 37 transfer RNA (tRNA) genes. Phylogenetic analysis revealed that the complete cpDNA sequence could be applicable as a super barcode to discriminate A. volubile var. pubescens from its closely related species and provides diverse information to investigate molecular DNA markers for the Aconiti Kusnezoffii Tuber.
MEMS/Nano-technologies for Smart Air Environmental Monitoring Sensors
( Inkyu Park ),( Daejong Yang ),( Kyungnam Kang ) 한국센서학회 2015 센서학회지 Vol.24 No.5
The importance of air quality monitoring is rapidly increasing. Even though state-of-the-art air quality monitoring technologies such as mass spectrometry, gas chromatography, and optical measurement enable high-fidelity measurement of air pollutants, they cannot be widely used for portable or personalized platforms because of their high cost and complexity. Recently, personalized and localized environmental monitoring, rather than global and averaged environmental monitoring, has drawn greater attention with the advancement of mobile telecommunication technologies. Here, micro- and nano-technologies enable highly integrated and ultra-compact sensors to meet the needs of personalized environmental monitoring. In this paper, several examples of MEMS-based gas sensors for compact and personalized air quality monitoring are explained. Additionally, the principles and usage of functional nanomaterials are discussed for highly sensitive and selective gas sensors.
Kang, Kyungnam,Yang, Daejong,Park, Jaeho,Kim, Sanghyeok,Cho, Incheol,Yang, Hyun-Ho,Cho, Minkyu,Mousavi, Saeb,Choi, Kyung Hyun,Park, Inkyu Elsevier 2017 Sensors and actuators. B Chemical Vol.250 No.-
<P><B>Abstract</B></P> <P>Integration of heterogeneous sensing materials in microelectronic devices is essential to accomplish compact and highly integrated environmental sensors. For this purpose, a micro-patterning method of electrospun metal oxide nanofibers based on electrohydrodynamic (EHD) printing process was developed in this work. Several types of metal oxide (SnO<SUB>2</SUB>, In<SUB>2</SUB>O<SUB>3</SUB>, WO<SUB>3</SUB> and NiO) nanofibers that were produced by electrospinning, fragmented into smaller pieces by ultrasonication, and dissolved in organic solvents were utilized as inks for the printing. Constant or pulsed wave bias consisting of base and jetting voltages were applied between a nozzle and a substrate to generate a jetting of nanofiber solutions. Several parameters for EHD printing such as pulse width, inner diameter of the nozzle, distance from the nozzle to the substrate, and stage speed, were optimized for accurate micro-patterning of electrospun nanofibers. By using optimized printing parameters, microscale patterns of electrospun nanofibers with a minimum diameter less than 50μm could be realized. Gas sensors were fabricated by EHD printing on the microelectrodes and then used for the detection of toxic gases such as NO<SUB>2</SUB>, CO and H<SUB>2</SUB>S. Four kinds of metal oxides could detect down to 0.1ppm of NO<SUB>2</SUB>, 1ppm of H<SUB>2</SUB>S and 20ppm of CO gases. Also, heterogeneous nanofiber gas sensor array was fabricated by the same printing method and could detect NO<SUB>2</SUB> using the sensor array platform with microheaters. Furthermore, microscale patterns of nanofibers by EHD printing could be applied to the suspended MEMS platform without any structural damage and this sensor array could detect NO<SUB>2</SUB> and H<SUB>2</SUB>S gases with 20mW power consumption.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new method for the microscale patterning of 1D metal oxide for integrated and low-power gas sensor array is proposed. </LI> <LI> Electrohydrodynamic (EHD) printing enables finer patterning of 1D metal oxide nanomaterials than other methods. </LI> <LI> Highly integrated and low-power MEMS gas sensor array has been realized by EHD printing of heterogeneous nanomaterials. </LI> </UL> </P>