http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Stable pH sensitivity of LaAlO3/SrTiO3 interfacial electronic gas
Dong Yan,Zhang Lunyong,Li Chen,Liu Yanli,Shao Pengfei,Lei Jianming,Wang Rui,Wu Di,Chen Dunjun,Zhang Rong,Zheng Youdou 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Probing pH value is essential for many applications. The request of developing stable and highly sensitive pH sensor with small size are increased recently, this is a challenge to the traditional glass pH sensors. This work investigated the pH sensing performance of the novel two-dimensional electronic gas (2DEG) at the LaAlO3/ SrTiO3 heterostructure interface discovered recently. The experimental results demonstrated that the devices host excellent sensing ability to the pH value of aqueous solutions. Quite stable output current is realized for a given pH value, and the output current is linearly dependent on pH value as required by sensor applications. This work would prompt the application research of LaAlO3/SrTiO3 heterostructure and design of new generation of advanced pH sensors.
Effects of Chlorine Addition to TiO2 Nanorods-Based Perovskite Solar Cells
Dong Zhao,Rendong Wang,Pengfei Wang,Shutao Li,Zhao Li,Meiling Sun,Yunyan Liu,Junshan Xiu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
Titanium dioxide (TiO2) nanorods (NR) structure and Chlorine substitution is beneficial to the extraction and diffusion of electrons in perovskite solar cells (PSCs). In this work, different concentrations of PbCl2 in perovskite are integrated with TiO2 (NR) to fabricate PSCs. The total thickness of perovskite absorber layer and electron transport layer (ETL) is about 850 nm, and the PSCs exhibit excellent performance. Scanning electron microscope (SEM) and X-ray diffraction (XRD) test reveal that moderate PbCl2 additive improves the perovskite film morphology and crystal quality of perovskite films. Optimal perovskite films with high crystallinity and uniform surface were prepared by adding 3 mol% PbCl2 into perovskite precursor solution, the crystal boundary and defect states are greatly reduced, thus reducing the electrons and holes recombination. The power conversion efficiency (PCE) enhancement of the device with this optimal molar ratio of PbCl2 is over 24% compared with the device without PbCl2.
A Hybrid Double Self-lift Switched-Coupled Inductor Quasi-Z-Source Inverter
Huang Dong,Xue Pengfei,Chen Guang,Zhang Chaozhong,Zhao Chang,Huang Yuchen,Ding Xinping,Zhang Min 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
A hybrid double self-lift switch-coupled-inductor quasi-Z-source inverter (HDSCL-qZSI) is proposed in this paper. The voltage boost capability is higher and the voltage and current stress on components are lower than the existing quasi-Z-source topologies. Owing to the strong current handling ability and step-down coupled-inductor, the magnetic elements are smaller than that of mSSCL-qZSI and SCL-qZSI whose structure are similar to that of HDCSL-qZSI. The operation principles, comparisons of voltage and current stress on components and the size of magnetic elements are analyzed theoretically. Finally, the eff ectiveness of the proposed HDSCL-qZSI was validated by a 1 kW prototype fabricated in the laboratory.
Fu Li,Pengfei Fei,Yongchun Dong,Man Zhang,Yu Feng,Shuqiang Liu,Lu Jia,Hulin Zhang,Zhen Ni 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
To balance the specific surface area and porous structure of nanofibrous heterogeneous Fenton catalyst for therapid transfer of dye molecules during dye-containing wastewater treatment, a polyacrylonitrile nanofiber with bimodaldiameter distribution (n-PAN-D) was prepared and amidoximated, followed by coordinating with Fe3+ ion (Fe-AO-n-PAND). The modification and coordination process hardly changed the fiber morphology and bimodal diameter distribution ofnanofiber membrane. The amidoximated degree of n-PAN-D increased with the increase of the diameter difference, and thecoordination ability of amidoximated n-PAN-D decreased with increasing the diameter difference. Fe-AO-n-PAN-D hadbetter catalytic activity than those with similar thick or thin nanofiber diameters due to the rapid mass transfer of dyemolecules in the catalyst. The possible oxidation and degradation pathway of Reactive Red 195 in the Fe-AO-n-PAN-D/H2O2system was proposed. And the series of reactions may not gradually occur because of the non-selective oxidation of ·OH. Thegood reusability of Fe-AO-n-PAN-D made it potential carrier for heterogeneous Fenton catalyst in wastewater treatment.
Chonghui Fan,Kelong Ao,Pengfei Lv,Jiancheng Dong,Di Wang,Yibing Cai,Qufu Wei,Yang Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
Fluorescent nitrogen-doped carbon dots (N-CDs) with excellent stability were prepared via single-step hydrothermal carbonization of citric acid (CA) and ethylenediamine (EDA). The as-prepared N-CDs emit blue fluorescence under the excitation of 365 nm and have a size distribution of 2.80 ffi 0.47 nm with benign size effect. The structure and morphology were further characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. It was found that the surface of the N-CDs was successfully functionalized, which presented water solubility and chelation with Fe3+. XRD results display a diffraction peak at 23.9 ℃, which corresponds to the (002) interlayer spacing of a graphitic structure revealing an amorphous carbon phase. Furthermore, due to good sensitivity, N-CDs were used as probes for Fe3+ detection. The low limit of detection of 0.6 μM as a fluorescence probe was successfully obtained based on the linear relationship between (F0 - F) / F0 and concentration of Fe3+ ions. Besides the satisfactory fluorescence, PVA/N-CDs membranes and fluorescent inks demonstrate potential for anti-counterfeiting applications due to its characteristic flexibility, transparency, removability and invisibility under ambient lighting.
필터버블과 프라이버시 염려가 지속이용의도에 미치는 영향에 대한 세대 간 비교연구: 유튜브 추천동영상 사용자를 중심으로
남승현(SeungHyeon Nam),Qin PengFei(PengFei Qin),권순동(Sun-dong Kwon) 한국창업학회 2022 한국창업학회지 Vol.17 No.6
본 연구는 유튜브 동영상 플랫폼이 개인화 추천시스템을 통하여 제공하는 추천동영상 서비스로 인하여 발생하는 정보다양성 감소로 인한 필터버블 현상과 프라이버시 염려에도 불구하고 추천동영상을 지속적으로 이용하고자 하는 프라이버시 역설 현상에 초점을 맞추어 이러한 현상이 발생하는지, 그리고 20대와 50대의 두 집단을 대상으로 어떠한 차이가 존재하는지를 실증분석을 통해 확인하고자 하였다. 실증분석 결과를 정리하면 다음과 같다. 첫째, 정보다양성 감소에도 불구하고 추천동영상을 지속적으로 이용할 것인지 분석한 결과, 추천동영상의 유용성이 존재할 경우 정보다양성 감소에도 불구하고 지속이용의도는 강하게 나타남을 확인하였다. 둘째, 추천동영상의 유용성을 전제할 경우, 프라이버시 염려에도 불구하고 추천동영상을 지속적으로 이용하고자 하는 프라이버시 역설 현상이 나타나는지를 분석한 결과 20대와 50대를 모두 포함한 설문대상 전체를 대상으로 프라이버시 역설 현상이 나타나지 않는 것으로 나타났다. 다만, 20대와 50대를 나누어 각각 살펴본 경우에는 다른 결과가 나타났음을 확인하였다. 셋째, 프라이버시 역설 현상이 20대와 50대에 어떤 차이를 보이는지 분석한 결과, 20대의 경우 프라이버시 역설 현상이 나타나지 않았으나 50대의 경우에는 프라이버시 역설 현상이 나타나는 것을 확인하였다. This study tires to find filter bubble and privacy paradox phenomenon when users are watching recommended videos provided by Youtube platform. For this purpose, the relationship among reduced information diversity, filter bubble and intention to use during using recommended videos in Youtube platform are empirically analyzed. Especially whether generation gap between twenties and fifties exists is also analyzed. According to the research results, some important implications are found. First, the relationship between reduced information diversity and continuous use of recommended videos is tested. These two concepts have strong positive relationship according to the research result. Second, the relationship between privacy concern and continuous use of recommended videos are tested in order to find privacy paradox. According to the research result, privacy paradox doesn’t exist in whole group, but generation gap between twenties and fifties are found to exist. Third, inter-generational differences in the privacy paradox are analyzed. According to the research result, older generation(50’s) shows privacy paradox phenomenon but younger generation(20’s) doesn’t show.
Single-Atom Switches and Single-Atom Gaps Using Stretched Metal Nanowires
Wang, Qingling,Liu, Ran,Xiang, Dong,Sun, Mingyu,Zhao, Zhikai,Sun, Lu,Mei, Tingting,Wu, Pengfei,Liu, Haitao,Guo, Xuefeng,Li, Zong-Liang,Lee, Takhee American Chemical Society 2016 ACS NANO Vol.10 No.10
<P>Utilizing individual atoms or molecules as functional units in electronic circuits meets the increasing technical demands for the miniaturization of traditional semiconductor devices. To be of technological interest, these functional devices should be high-yield, consume low amounts of energy, and operate at room temperature. In this study, we developed nanodevices called quantized conductance atomic switches (QCAS) that satisfy these requirements. The QCAS operates by applying a feedback-controlled voltage to a nanoconstriction within a stretched nanowire. We demonstrated that individual metal atoms could be removed from the nanoconstriction and that the removed metal atoms could be refilled into the nanoconstriction, thus yielding a reversible quantized conductance switch. We determined the key parameters for the QCAS between the 'on' and 'off' states at room temperature under a small operating voltage. By controlling the applied bias voltage, the atoms can be further completely removed from the constriction to break the nanowire, generating single-atom nanogaps. These atomic nanogaps are quite stable under a sweeping voltage and can be readjusted with subangstrom accuracy, thus fulfilling the requirement of both reliability and flexibility for the high-yield fabrication of molecular devices.</P>