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Xin Lin,Junda Gong,Hang Li,Haiyun Zhang,Yang Yu,Wenyi Tan 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1
Solar-powered electrocoagulation (EC) process is proven to be an alternative option for wet flue gas desulfurization (WFGD) wastewater treatment, due to simultaneous removal of multiple pollutants efficiently and reduce the operation costs significantly. Rapid and stable photoelectricity response is necessary for the removal efficiency of pollutants (eg. COD and turbudity), especially in low solar irradiation intensity. In this paper, dimensionally stable anode (DSA) and operation voltages in EC process driven by solar cells were investigated, for the purpose of the optimized removal of pollutants, including COD, turbidity, (free residual chlorine and chlorine dioxide). The results show that the removal efficiency of COD and turbidity can respectively reach 59.12% and 39.11% within 30 min of illumination time (the enhanced solar radiation = 915.8 W m<SUP>-2</SUP>), when Ti-based plates were adopted. The concentration of free residual chlorine and chlorine dioxide can reach 2.70 and 5.31 mg L<SUP>-1</SUP>, indicating that chlorine ions present in WFGD wastewater have been converted into active chlorine partly. Solar-powered EC equipped with Ti-based plates have a potential prospect in EC process for WFGD wastewater treatment.
Xin Lin,Ying Liu,Yong Zhang,Peng Yang,Xianzhe Cheng,Jing Qiu,Guanjun Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.10
A polymer-assisted pressure sensor with piezoresistive suspended graphene is proposed and fabricated with high yield. Our sensor exhibits a good pressure response comparable to that of commercial sensors. The sensitivity is estimated to be 2.87 x 10 -5 kPa -1, higher than that of similar Si-based pressure sensors. The influence of the temperature on the sensor performance is systematically analyzed. An inverse temperature response is observed, and a nonnegligible temperature effect on the sensor resistance is demonstrated. Considering the temperature-induced cavity pressure change, a new temperature–resistance model is built to explain the nonlinearity of the sensor response to the temperature variation. Experiments under different test voltages show the influence of the current thermal effect, which is similar to that of temperature and nonnegligible for high-precision pressure sensors. Our new sensor holds great potential for practical application, and the findings on the temperature characteristics open up a route to further improve the sensor performance.
Xinlin Li,Hyeok-jin Kwon,Xueqin Zhang,Ho Kwang Choi,Sooman Lim,Tae-Wook Kim,Se Hyun Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
Direct-patterned Cu-based conductive electrodes were printed through electrohydodynamic (EHD) jetprinting via cone-jet mode. The introduction of a capping agent in the synthesis of the Cu ink limitedexcessive conductivity, which enabled the pristine Cu ink to achieve the various printing modes of EHDjet printing: dripping, micro-dripping, cone-jet, and multi-jet. We also obtained optimal printingconditions by adjusting the viscosity by adding poly(ethylene oxide) (PEO) to the pristine Cu inks,resulting in well-defined printing patterns. The optimized PEO content in the ink was determined tobe10 wt%, which gave us a stable cone-jet mode and well-defined Cu/PEO composite electrode lineswith sharp edges. We utilized the Cu/PEO composite electrode lines as source and drain and atriisopropylsilylethynyl (TIPS)–pentacene/PS blend as the active layer for bottom-gate bottom-contactorganicfield-effect transistors (OFETs). The resulting devices exhibited an averagefield-effect mobility(mFET), threshold voltage (Vth), and on/off current ratio (Ion/Ioff) of 0.253 cm2/V, 0.253 V, and106,respectively.
XINLIN LIU,Yingying Qin,Mingjun Zhou,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1 g CdS/Fe3O4/rGO photocatalyst into 20 mg/L tetracycline for 2 h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that e? was the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.
XINLIN LIU,Yongsheng Yan,Qian Wang,Peng Lv,GUANXIN YAO,CHANGCHANG MA,Yan Yan,Yanfeng Tang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
A new-type photocatalyst of cadmium sul¯de carbon nanotubes (CdS/CNTs) was prepared bythe hydrothermal method. This as-prepared CdS/CNTs composite photocatalyst was proved toexhibit an excellent photocatalytic activity for degradation of tetracycline (TC). Specially, the95%-CdS – 5%-CNTs composite photocatalyst played the best degradation rate (81.2%) in 60 minunder the visible light irradiation. Moreover, this 95%-CdS – 5%-CNTs composite photocatalystpossessed great stability and could be used at least four cycles with almost no loss of photo-catalytic e±ciency. Furthermore, the as-synthesized CdS/CNTs composite photocatalyst wascharacterized by X-ray di®raction (XRD), transmission electron microscopy (TEM), UV-Visdi®used re°ectance spectra (UV-Vis), Raman and thermal gravimetry (TG). In addition, thepossible mechanism and kinetics of photodegradation of TC with CdS/CNTs photocatalyst wasalso discussed.
Xinlin Li,Eun Mi Jung,Ki Seung Kim,Jeong Hyun Oh,Tae Kyu An,Seung Woo Lee,Se Hyun Kim 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
An electrohydrodynamic jet (EHD) printing process was optimized for the patterning of an indium tin oxide (ITO) nanoparticlesink by manipulating its surface tension through the addition of a nonionic surfactant, Triton X-100 (TX-100). Asa result, a stable cone-jet mode was performed, which could provide printed drops with the smallest diameter and printingfidelity among EHD jet printing modes, and lead to a line width ranging from 230 μm to 30 μm in addition to well-definepatterns with various shapes for ITO transparent conducting electrodes (TCEs). The multi-printing technique and subsequentthermal annealing for printed ITO TCEs allows improvement in its electrical conductivity. In addition, the evolutionof the chemical composition and crystalline structure of the printed ITO TCE according to the annealing temperature wasinvestigated to determine the optimal conditions to utilize printed ITO nanoparticles for ZnO-based thin-film transistors.
Li, Xinlin,Jeong, Yong Jin,Jang, Jaeyoung,Lim, Sooman,Kim, Se Hyun The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.2
<P>In this article, we report on the direct writing of multi-walled carbon nanotube (MWCNT) composite inks based on three different surfactants <I>via</I> the electrohydrodynamic (EHD) jet printing technique. All three surfactants, including two types of polymeric surfactants and an ionic surfactant, successfully dispersed the MWCNTs in the ink medium. Although the MWCNT composite with the ionic surfactant could not be printed by the EHD process, the MWCNT composites with polymeric surfactants could be successfully printed using this technique. Furthermore, the printed lines exhibited different electrical and electronic characteristics, depending on the type of surfactant. A large amount of the poly(4-styrenesulfonic acid) (PSS) surfactant was required to disperse the MWCNTs in ethanol, whereas a smaller amount of polymeric Triton X-100 (TX100) was required to obtain a MWCNT composite suspension in distilled water, and therefore, the printed lines of the latter provided higher conductivities. In addition, the surface potential and charge carrier injection properties of the EHD-printed MWCNT lines depended on the type of surfactant in the MWCNT composite. Finally, organic field-effect transistors (OFETs) employing source/drain electrodes based on MWCNT/surfactant composites exhibited opposing electrical characteristics depending on the type of surfactant. The MWCNT/PSS lines showed excellent electrical performance when used as electrodes in p-type OFETs, whereas the MWCNT/TX100 lines exhibited excellent performance when used as electrodes in n-type OFETs.</P>