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Wang Caifeng 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.1
ZnS/Au/ZnS (ZAZ) films which are nano-multilayer and transparent conductive films, were fabricated on quartz substrates at different substrate temperatures via pulsed laser deposition, and the influences of substrate temperature on the structural and optoelectrical characteristics of ZAZ films were researched. X-ray diffraction (XRD) diagrams show that the crystallinity and the quality of the films are improved at higher substrate temperatures, and scanning electron microscope (SEM) show that the film’s surface becomes dense and rough. The substrate temperature also seriously affects the optoelectronic characteristics of ZAZ films. When the substrate temperature is increased, the figure of merit for the ZAZ films decreases. When substrate temperature is 20 ℃, the ZAZ film has the largest figure of merit value (3.34 × 10–3 Ω−1), with an average transmission of 81% in the visible region and a carrier concentration of 1.91 × 1021 cm−3. Transparent, conducting ZAZ films have great potential applications in high-performance optoelectronic devices.
Wang Boyu,Guo Xiaolin,Yuan Lin,Fang Qinglong,Wang Xiaojuan,Qiu Tianyi,Lai Caifeng,Wang Qi,Liu Yang 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
In this study, a series of flexible neutron/gamma shielding composites are fabricated through the doping of Gd2O3 into the matrix of SEBS with (MGd2O3: MSEBS) % from 5% to 100%. Neutron transmittance test shows an exponential attenuation with the increase of areal density of Gd, in which the transmittance T ranges from 59.1440% to 35.3026%, with standard deviation less than 2.2743%, mass attenuation coefficient mm from 0.3194 cm2 /g to 0.4999 cm2 /g, and half value layer-HVL value from 2.4530 mm to 1.1313 mm. Shielding efficiency of the Gd2O3/SEBS composites is basically improved in comparison with that of B4C/SEBS. The transmittance T, mass/linear attenuation coefficient mm and m, HVL and effective atomic number Zeff for the shielding of g rays (39 keV, 59 keV and 122 keV) are measured and calculated with XCOM as well as MCX programs. Finally, plots of the three dimensional relationships between transmittance, doping amount and thickness are provided to the guidance for engineering shielding design. In summary, the Gd2O3/SEBS composite is proved to be an effective flexible neutron/low energy g rays shielding material, which could be of potential applications in the field of nuclear technology and nuclear engineering.
Optoelectronic Characteristics of UV Photodetector Based on GaN/ZnO Nanorods p-i-n Heterostructures
Qingshan Li,Lichun Zhang,Fengzhou Zhao,Caifeng Wang,Feifei Wang,Ruizhi Huang 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
We demonstrate an efficient ultraviolet (UV) photodetector operating at room temperature based on n-ZnO nanorods/i-ZnO/p-GaN heterojunctions. We employ x-ray diffraction and field-emission scanning electron microscopy to confirm the high quality of the ZnO nanorods using an undoped ZnO film as the interlayer. Then, we investigate the photoelectric properties of the fabricated photodetector with UV light illumination under a different reverse bias. Based on the current-voltage curve, the photocurrent to dark current ratio is approximately 73.3 at −4 V. At zerobias voltage, the peak responsivity was 138.9 mA/W at 362 nm under front-illumination conditions. Time-varying measurements indicate the reproducibility and stability of the heterojunction photodetector.
Au nanozyme-driven antioxidation for preventing frailty
Kim, Jeonghyo,Oh, Sangjin,Shin, Yong Cheol,Wang, Caifeng,Kang, Moon Sung,Lee, Jong Ho,Yun, Woobin,Cho, Jin Ah,Hwang, Dae Youn,Han, Dong-Wook,Lee, Jaebeom Elsevier 2020 Colloids and surfaces Biointerfaces Vol.189 No.-
<P><B>Abstract</B></P> <P>From senescence and frailty that may result from various biological, mechanical, nutritional, and metabolic processes, the human body has its own antioxidant defense enzymes to remove by-products of oxygen metabolism, and if unregulated, can cause several types of cell damage. Herein, an antioxidant, artificial nanoscale enzyme, called nanozyme (NZs), is introduced that is composed of Au nanoparticles (NPs) synthesized with a mixture of two representative phytochemicals, namely, gallic acid (GA) and isoflavone (IF), referred to as GI-Au NZs. Their unique antioxidant and anti-aging effects are monitored using Cell Counting Kit-8 and senescence-associated β-galactosidase assays on neonatal human dermal fibroblasts (nHDFs). Furthermore, alterations in epidermal thickness and SOD activity are measured under ultraviolet light to investigate the effects of the topical application of NZs on the histological structure and antioxidant activity in hairless mice skin. Then, hepatotoxicity and nephrotoxicity in the hairless mice are monitored. It is concluded that the NZs can effectively prevent serial passage-induced senescence in nHDFs, as well as oxidative stress in mice skin, suggesting a range of strategies to further develop novel therapeutics for acute frailty.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>In vitro</I> and <I>in vivo</I> antioxidant effects of Phyto-Au NZs are shown to deter frailty. </LI> <LI> Phyto-Au NZs showed enhanced catalytic activity. </LI> <LI> Cytoprotective effects against serial passage and H<SUB>2</SUB>O<SUB>2</SUB>-induced senescence were shown. </LI> <LI> Phyto-Au NZs caused a decrease in epidermal thickness and an increase in SOD activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>