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Temperature-Dependent Photovoltaic Characterization of a CdTe/CdSe Nanocrystal’s Solar Cell
Huichao Zhang,Zhengyang Li,Jun Qian,Qiumei Guan,Xiaowei Du,Yiping Cui,Jiayu Zhang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
An all-inorganic thin film solar cell was fabricated with colloidal CdTe and CdSe nanocrystals. Its temperaturedependent photovoltaic characterization was measured, and an open circuit voltage decay technique was used to determine the electron lifetime. The photovoltaic parameters, such as the exact carrier lifetime, were remarkably different between under low-temperature region and under temperature above 267 K. It is suggested that the temperature-dependent carrier conductivity results from a thermally-activated hopping process and this nanocrystals device is a kind of donor-acceptor solar cell.
Jiang, Bin,Zhang, Chunfeng,Wang, Xiaoyong,Park, Min Joo,Kwak, Joon Seop,Xu, Jian,Zhang, Huichao,Zhang, Jiayu,Xue, Fei,Xiao, Min WILEY‐VCH Verlag 2012 Advanced Functional Materials Vol.22 No.15
<P><B>Abstract</B></P><P>The energy transfer (ET) between InGaN/GaN multiple‐quantum‐well (MQW) nanorods (NRs) and semiconductor nanocrystals (NCs) for efficient color conversion is studied. An exceptional contribution of carrier transport confinement to the ET mechanisms is observed in the proximal side‐wall coupling system, which consists of InGaN/GaN NRs and CdSe NCs. Under relatively low or high excitation, the ET rate shows different carrier‐density dependence, resulting from different electron‐hole configurations, i.e., bound excitons and free carriers. In the localized exciton regime, the ET rate decreases when increasing temperature from 20 K to 200 K. However, in the free‐carrier regime, the ET rate varies insignificantly in the same temperature range. The temperature dependence in this NR‐NC coupling system is different from that in the previously studied planar MQW‐NC coupling system. It is suggested that the carrier transport confinement in NRs is a major factor for these divergences. The highly efficient ET with efficiency up to 80% shows a promising potential of using such NR‐NC coupled structures for ET‐pumped, NC‐based, light‐emitting devices.</P>
Stability of phenolic acids and the effect on weed control activity
Jiayu Li,Qi Zhang,Wenwen Hu,Xiaoyan Yang,Haibin He 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.6
Phenolic acid is a very important class of allelochemicals with allelopathic weed control activity. In this study, three benzoic acid derivatives (syringic, 4-hydroxybenzoic, and vanillic acids), three cinnamic acid derivatives (cinnamic, 4-hydroxycinnamic, and ferulic acids) were tested, and high-performance liquid chromatography was used to conduct a dynamic analysis on the changes in the concentration of phenolic acids in a bioassay based on the initial concentration and test time. The results showed that the concentration of individual phenolic acids and a solution of mixed phenolic acids decreased to a certain extent irrespective of environment, i.e., bioassay (4–7 days) or a ricegrowing environment, and a significant decrease in concentration was measured after 48 h. Based on the above results, the laboratory bioassay was conducted using a fresh solution of phenolic acids every 48 h. The results showed that the instability of phenolic acid could affect its weed control activity, and this effect was more significant for high concentrations of phenolic acids. On the other hand, changing the solution did not have a significant impact on the weed control activity of phenolic acids in the natural environment (pH 6.50), in which allelopathic rice release phenolic acids. These results reveal the instability of phenolic acids could significantly reduce the inhibition rate on the growth index for receptor plants in an indoor bioassay.
Jiayue Cui,Hongliang Zhang Techno-Press 2023 Advances in nano research Vol.15 No.3
In the present study, we aim to use nanotechnology sensors/actuators to capture pressure and frequency of voice singers and to send signals for improving breathing pressure. In this regard, a circular composite structure having 3 different layers are used. The core layer is nano-composite material reinforced with graphene nanoplatelets. The face sheets are piezo electric materials connected to electrical circuit capable of measuring and applying voltage to the piezoelectric layers. This sensors have extremely smaller size than conventional sensors attached to the neck of singer and, hence, minimizes the influences on the output voice of the singer. A brief theoretical framework are presented for nonlocal strain gradient theory and geometry of the sensor is described in detail. The controlling procedure along with experimental results on 20 amateur and professional singer participants are also presented. The results of the study indicate that the participants could gain benefit from the device for improving their ability in phonation and keeping their frequency at a constant level although they have difficulty in the beginning of the experiment getting used to the device.
Stability of phenolic acids and the effect on weed control activity
Li, Jiayu,Zhang, Qi,Hu, Wenwen,Yang, Xiaoyan,He, Haibin 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.6
Phenolic acid is a very important class of allelochemicals with allelopathic weed control activity. In this study, three benzoic acid derivatives (syringic, 4-hydroxybenzoic, and vanillic acids), three cinnamic acid derivatives (cinnamic, 4-hydroxycinnamic, and ferulic acids) were tested, and high-performance liquid chromatography was used to conduct a dynamic analysis on the changes in the concentration of phenolic acids in a bioassay based on the initial concentration and test time. The results showed that the concentration of individual phenolic acids and a solution of mixed phenolic acids decreased to a certain extent irrespective of environment, i.e., bioassay (4-7 days) or a ricegrowing environment, and a significant decrease in concentration was measured after 48 h. Based on the above results, the laboratory bioassay was conducted using a fresh solution of phenolic acids every 48 h. The results showed that the instability of phenolic acid could affect its weed control activity, and this effect was more significant for high concentrations of phenolic acids. On the other hand, changing the solution did not have a significant impact on the weed control activity of phenolic acids in the natural environment (pH 6.50), in which allelopathic rice release phenolic acids. These results reveal the instability of phenolic acids could significantly reduce the inhibition rate on the growth index for receptor plants in an indoor bioassay.
Guihua Meng,Jiayu Yan,Jianning Wu,Weifang Zhang,Yixi Wang,Qian Wang,Zhiyong Liu,Xuhong Guo 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
Water pollution severely effects human health and ecosystems. This paper presents a simple method of superhydrophobic cotton fabric fabrication for oil/water separation, We implemented thiol-ene reaction using 3-(Trimethoxysilyl)propyl methacrylate (TMSPMA) and n-dodecyl mercaptan (NDM). to synthesize low surface energy hydrophobic modifier. Superhydrophobic cotton fabrics demonstrated excellent superhydrophobicity, which makes them outstanding materials for continuous and simultaneous removal of insoluble and emulsified oils. Chemical composition, morphology, and hydrophobicity of these cotton fabrics were confirmed by FTIR spectra, scanning electron microscopy (SEM), and water contact angle measurements, respectively. Fabrics samples maintained their superhydrophobic propertieseven after 20 cycles, separation efficiency was still above 98.5 %. Our superhydrophobic cotton fabric demonstrated a remarkable separation of emulsified oil. We believe that our quick and environmentally friendly method can be used in variety of applications involving water-in-oil emulsion separation and oil purification.
Bobo Yang,Jiayue Xu,Jun Zou,Yan Zhang,Tian Tian,Yaoqing Chu,Meiling Wang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Tm3+, Dy3+ and Tm3+/Dy3+ co-doped bismuth silicate (Bi4Si3O12, BSO) crystals were successfully grown by the modified verticalBridgeman method. The crystals have about 80% transmittance in the range from 320 nm to 650 nm except several obviouscharacteristic absorption peaks corresponding to transitions of 4f electrons of Tm3+ and Dy3+. The luminescence properties forwhite light emitting diode (w-LED) were investigated. Energy transfer from the Bi3+ ions to the Tm3+ and Dy3+ ions in Tm3+or/and Dy3+ co-doped Bi4Si3O12 crystal has been established by photoluminescence investigation upon UV excitation. Whenexcited by a proper UV-light, Tm3+ doped BSO crystal shows blue emission band centered at 460 nm ascribed to Tm3+ (1D2→ 3F4), Dy3+ doped BSO crystal shows blue band at 480 nm (4F9/2→ 6H15/2), yellow band at 574 nm (4F9/2→ 6H13/2) and red bandat 662 nm (4F9/2→ 6H11/2) of Dy3+ ions. A white light with chromaticity coordinate of x = 0.3298, y = 0.2905 by excitation of357 nm is achieved from Tm3+/Dy3+ co-doped Bi4Si3O12 crystal. These results indicate that Tm3+/Dy3+ co-doped Bi4Si3O12 as awhite emitting crystal has a potential application in white-LED.
Setosphapyrone C and D accelerate macrophages cholesterol effl ux by promoting LXRa/ABCA1 pathway
Ting Li,Jiayu Yin,Yubin Ji,Ping Lin,Yanjie Li,Zixun Yang,Shumei Hu,Jin Wang,Baihui Zhang,Saloni Koshti,Junfeng Wang,Chenfeng Ji,Shoudong Guo 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.8
LXRα agonists have attracted signifi cant attentiondue to their potential biological activities on promotingcholesterol effl ux. This study was designed to investigatewhether setosphapyrone C and D have potential lipid-loweringcapacity and the underlying mechanisms in vitro. Ourdata showed that setosphapyrone C and D had weak cytotoxicitycompared to the liver X receptor α (LXRα) agonistT0901317. In RAW 264.7 macrophages, setosphapyroneC and D signifi cantly enhanced [ 3 H]-cholesterol effl ux by~ 21.3% and 32.4%, respectively; furthermore, setosphapyroneC and D enhanced the protein levels of ATP-bindingcassette transporter (ABC) A1 and LXRα by 58% and 69%,and 60% and 70% (8 μM), respectively; however, they had noeff ect on the protein levels of ABCG1 and scavenger receptorB type 1; additionally, they had minor eff ect on the mRNAexpression of lipogenic genes. Of note, setosphapyrone C and D signifi cantly enhanced LXRα/ABCA1pathway inmice primary macrophages. In BRL cells, setosphapyroneC and D signifi cantly improved the protein levels of ABCA1and ABCG1; setosphapyrone D signifi cantly enhanced theprotein expression of low-density lipoprotein. Collectively,setosphapyrone C and D with weak cytotoxicity exhibitedeff ective lipid-lowering eff ect via enhancing LXRα/ABCpathways. Setosphapyrones possess potential applicationfor the treatment of hyperlipidemic diseases.