JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 2
·869-877
·
IF 2.302
Fan Shaohua,Wang Shikai,Xu Wenbin,Li Meng,Sun Hongtao,Hu Lili
Efficient upconversion (UC) microcrystals are important for the development of novel photonic markers, solid-state lasers, displays, etc. Herein, we report on greatly enhanced UC emission in β-NaYF 4 :20Yb,2Er microcrystals via a simple ion-exchange reaction. The ion exchange accompanying with an ionic redistribution process is demonstrated. By simply controlling the amount of NaF (0–8.0 mmol), reaction temperature (140–220 °C), and duration (0–144 h), enormous enhancement of the UC emission up to ~4200 times is obtained compared with the pre-synthesized β-NaYF 4 :20Yb,2Er microcrystals. The decrease of body defects and change of local structure around lanthanide may account for the UC emission enhancement. This method may apply to other UC materials to increase the UC emission efficiency.
研究领域:
材料科学
·
光子学
·
纳米技术
·
无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 24
·14742-14751
·
IF 3.442
Yang Tao,Li Xing,Wang Liming,Liu Yiming,Chen Kaijian,Yang Xun,Liao Lei,Dong Lin,Shan Chong-Xin
Due to their unique structure and photoelectrical properties, two-dimensional (2D) materials have attracted enormous attention on next-generation optoelectronic devices. Recently, the newly discovered 2D layered Bi 2 O 2 Se has exhibited outstanding sensitivity and optoelectronic properties. However, the performance of these 2D layered Bi 2 O 2 Se photodetectors can be limited by the high dark currents. The suitable band structure of 2D MoSe 2 can form a type-II heterojunction with Bi 2 O 2 Se, which can reduce the dark current, modulate the interlayer transition energy and induce the charge spatial separation. Herein, we demonstrated a photodetector based on the heterojunction fabricated by van der Waals assembly between Bi 2 O 2 Se and few-layer MoSe 2 , showing visible to near-infrared detection range. Moreover, our results showed that the dark current of this photodetector was significantly reduced and the I on /I off ratio was greatly improved. Importantly, it exhibited a broad detection range from 405 to 808 nm with a responsivity of 413.1 mA W −1 , a high detectivity of 3.7 × 10 11 Jones (at 780 nm) at room temperature. Compared with the 2D Bi 2 O 2 Se photodetector, the photocurrent response and recovery time in the heterojunction photodetector was greatly reduced from 1.92/1.31 to 0.79/0.49 s at room temperature. Our results showed that 2D Bi 2 O 2 Se/MoSe 2 heterojunction has a great potential for broadband and fast photodetection.
研究领域:
凝聚态物理
·
纳米光电子学
·
材料科学
·
半导体器件
·
低维材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yongbin Zhang,Yongfei Huang,Yongkang Yue,Jianbin Chao,Fangjun Huo,Caixia Yin
Because of the high toxicity of hydrazine, the development of ultrasensitive fluorescent probes for hydrazine has been challenging. In this work, an ultrasensitive fluorescent probe based on o -phthalaldehyde has been exploited for hydrazine. The probe was designed based on creating an efficient fluorophore by incorporating hydrazine into o -phthalaldehyde framework via an intermolecular condensation-cyclization reaction. The probe could quickly detect hydrazine and displayed a high sensitivity for hydrazine with a LOD of 1.9 nM (0.06 ppb), which is far below the U.S. Environmental Protection Agency standard (10 ppb). Moreover, the probe was successfully applied to the detection of hydrazine in real water samples and hydrazine vapor.
研究领域:
分析化学
·
环境监测
·
生物传感
·
分子探针
·
毒理学
✓ 已验证
DOI
高影响因子
Advances in Materials Science and Engineering
·
2018
·Vol. 2018
·期 1
·8191095
·
IF 1.372
Xue-Yu Tao,Jie Ma,Rui-Lin Hou,Xiang-Zhu Song,Lin Guo,Shi-Xiang Zhou,Li-Tong Guo,Zhang-Sheng Liu,He-Liang Fan,Ya-Bo Zhu
Star-like nano-ZrO 2 has been synthesized using Zr(NO 3 ) 4 ·5H 2 O as zirconium source by a hydrothermal process without any template and surfactant. The structure of the as-prepared ZrO 2 powder was investigated by multiple advanced analytical methods. The results showed that CH 3 COO − and NO 3 − had great effects on the formation of star-like ZrO 2 nanostructures. The as-prepared ZrO 2 had a superior catalytic activity, and the reason for it was analyzed by UV-Vis diffuse reflectance spectroscopy. The effect of raw material ratios on the photocatalytic property of ZrO 2 was studied. The synthesized ZrO 2 showed a narrow bandgap (3.50–3.85 eV) and an excellent photocatalytic activity, and the degradation of RhB was up to nearly 100% in 30 min with this photocatalyst.
研究领域:
材料科学
·
纳米科技
·
光催化
·
无机化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weihong Gao,Geng Li,Qiuwen Wang,Lijun Zhang,Kang Wang,Shaoxuan Pang,Guangming Zhang,Longyi Lv,Xiaoyang Liu,Wenfang Gao,Li Sun,Yuguo Xia,Zhijun Ren,Pengfei Wang
Exploring advanced photocatalysts for antibiotics degradation is highly desired but remains a challenge due to the lack of reasonable structural design and molecular oxygen activation. Herein, we deliberately design novel ultrathin porous Bi 2 WO 6 with rich surface oxygen vacancies (V O -rich BWO) to enhance the tetracycline adsorption and photocatalytic reactive oxygen species generation. The oxygen vacancies in V O -rich BWO can narrow its bandgap to enhance the light absorption and introduce defect level, which can promote electron separation and transfer. Furthermore, the multiplication of oxygen vacancies increases the adsorption energy of O 2 , thus enhancing the chemisorption of O 2 , thereby activating O 2 to produce more •O 2 − . Meanwhile, the porous structure enhances the adsorption capacity of V O -rich BWO to tetracycline molecules, allowing for a more efficient use of the •O 2 − . Taking advantage of the synergy, the rich oxygen vacancies Bi 2 WO 6 nanosheets are able to degrade adsorbed tetracycline in situ with a degradation efficiency approximately 52.6 times that of bulk BWO, thus holding great potential for removing organic pollutants.
研究领域:
环境催化
·
材料科学
·
光化学
·
环境污染治理
·
纳米材料
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2016
·
IF 1.088
Shuangqiao Ju,Mousheng Liu,Yaling Yang
Magnetic solid-phase extraction was used for the preconcentration of cadmium, lead, and cobalt in Moringa Oleifera with determination by flame atomic absorption spectrometry. Fe3O4 nanoparticles were modified by oleic acid to form the sorbent for magnetic solid-phase extraction. The modified sorbent was characterized by transmission electron microscopy, infrared spectroscopy, and X-ray diffraction. The preconcentration was optimized for the mass of nanoparticles, pH, adsorption time, the presence of coexisting ions, solution volume, eluent, and reuse. The optimized limits of detection were 0.09, 0.26, and 0.54 µg/L for Cd(II), Pb(II), and Co(II) with relative standard deviations below 4.3%. The method was employed for the analysis of Moringa oleifera and recoveries between 90.0 and 102.0% were obtained.
研究领域:
分析化学
·
环境毒理学
·
植物营养学
·
食品安全
·
重金属检测
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 7
·2310-2321
·
IF 4.029
Lianwei Shan,Yuteng Liu,Hongtao Chen,Ze Wu,Zhidong Han
We prepared an α-Bi2O3/BiOBr core–shell heterojunction via a facile in situ chemical transformation method. Ultrathin BiOBr nanosheets were observed and these were found to be evenly distributed on the surface of α-Bi2O3/BiOBr by SEM and TEM. The results revealed that the prepared α-Bi2O3/BiOBr photocatalysts were porous, and their specific surface areas were found to be raised on comparing with α-Bi2O3 and BiOBr. In our experiments, the photocatalytic activity of α-Bi2O3 was obviously enhanced when assembling with ultrathin BiOBr compared with α-Bi2O3/BiOBr and the individual phase. It is considered that the surface porous structure increases the specific surface areas, which improved the adsorption characteristics of α-Bi2O3/BiOBr. The suitable band alignment (between α-Bi2O3 and BiOBr) and oxygen vacancy effect can be attributed to the increased photocatalytic activity under visible irradiation.
研究领域:
材料科学
·
物理化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2015
·Vol. 58
·期 5
·881-888
·
IF 1.192
Yang AiLing,Li ShunPin,Wang YuJin,Wang LeLe,Bao XiChang,Yang RenQiang
Ag@Cu 2 O core-shell metal-semiconductor nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Ag@Cu 2 O core-shell NPs were easily converted to Ag@Cu bimetallic core-shell NPs with the help of surfactant PVP and excessive reducer ascorbic acid in air at room temperature, which is a unique phenomenon. Varying volumes of Ag colloidal solutions were added into the reaction mixtures containing fixed initial concentrations of Cu 2+ and PVP, Ag@Cu 2 O and Ag@Cu core-shell NPs with fixed core size but varying outer shell thicknesses could be obtained. The composites, structures, morphologies and extinction properties of Ag@Cu 2 O and Ag@Cu core-shell NPs were systematically characterized by XRD, TEM and extinction spectra. Both of these NPs show wide tunable optical properties. The extinction peaks could be shifted from 421 nm to 700 nm. FTIR results reveal that Cu + ions on the surface of Cu 2 O nanocrystalline coordinate with N and O atoms in PVP and further are reduced to metallic Cu by excessive ascorbic acid and then form a nucleation site on the surface of Cu 2 O nanocrystalline. PVP binds onto a different site to proceed with the reduction until all the Cu sources in Cu 2 O NPs are completely assumed. And the shell of Cu 2 O is converted to Cu shell. The synthesis approach in this paper is simple and also a promising reference for synthesizing other core-shell NPs. Ag@Cu 2 O NPs can be easily converted to Ag@Cu NPs in air at room temperature, which is promising to be used in electronic devices.
研究领域:
纳米材料化学
·
无机功能材料
·
胶体与界面化学
·
光谱学
·
半导体物理
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 9
·579
·
IF 3.8
Qingbao Gan,Jianwei Zhang,Jinglin Wang,Yuntian Wei,Shikun Chen,Shuguang Cai,Xueqing Xiao,Chan Zheng
The excessive discharge of antibiotics into aquatic systems is a major issue in many countries worldwide and poses a threat to human health and the sustainable development of society. Hence, developing efficient treatment methods and purification technologies to degrade antibiotics is essential. Herein, we present the synthesis of low-cost, self-propelled tubular Fe3+-incorporated graphitic carbon nitride (g-C3N4-Fe@KF) micromotors using kapok fibers (KFs) as templates and their application as photo-catalysts for the photo-Fenton degradation of tetracycline (TC) under visible-light irradiation. The g-C3N4-Fe@KF micromotors moved rapidly when being propelled by oxygen bubbles generated in a hydrogen peroxide (H2O2) solution as a result of a photo-assisted Fenton reaction. The motion behavior of the g-C3N4-Fe@KF micromotors was dependent on the concentration of H2O2and the length of the micromotors. The propulsion mechanism was discussed in detail. The micromotors efficiently degraded antibiotics via the photo-Fenton process. Photo-Fenton degradation efficiency was attributed to the synergistic effects of the doped Fe3+and g-C3N4under visible-light irradiation and self-propulsion of the micromotors. In addition, the micromotors possessed good reusability, thereby efficiently realizing multiple cycles of degradation. The current work offers an avenue for the design of micromotors, using inexpensive approaches, for various potential environmental applications.
研究领域:
环境科学
·
材料科学
·
催化化学
·
纳米技术
·
水污染治理
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2015
·
IF 1.955
Xiulan Hu,Yanqiu Xu,Haikui Zhu,Fengnan Hua,Shoufeng Zhu
Square-like bismuth oxychloride (BiOCl) nanoplates with high exposed {001} facets were successfully synthesized through a facile hydrothermal process in the presence of sodium citrate . Citric anions reduce BiOCl nanoplate size and lead to high intensity ratio of (001)–(102) by selectively absorbing on the {001} facets of BiOCl nanoparticles or nanoplates. Size of BiOCl nanoplates decrease to about 200 nm when 1.5 mmol sodium citrate was added. Thickness of BiOCl nanoplates also decreases from 100 nm to about 45 nm with increasing sodium citrate amounts. Diffraction peak intensity ratio of (001)–(102) of BiOCl nanopaltes is up to 0.93 with the adding of 1.5 mmol sodium citrate. As-obtained BiOCl nanoplates show a higher photocatalytic activity for degrading methyl orange (MO) than that prepared without sodium citrate under simulated sunlight irradiation.
研究领域:
材料化学
·
纳米科学
·
光催化
·
无机合成
·
环境功能材料
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 66
·期 13
·1986-1994
·
IF 1.312
Dongmei He,Du Liyong,Wang Keyan,Ding Yuqiang
As a cost-effective material, CuO has been widely used in many emerging fields. The synthesis method plays a key role in the performance of the material. Atomic layer deposition (ALD) has been developed as a precise technique to deposit materials with great control at atomic scale. Herein, an efficient process of ALD CuO is reported by using [Cu( s Bu-amd)] 2 and O 3 as precursors. CuO films can be deposited on SiO 2 substrates with typical self-limiting growth behaviors at 120–220°C. Notably, the growth rate of the CuO films is reach up to 2.5 Å/cycle, which is 6~12 times more than the available value. This remarkably high efficiency is the critical factor to promote the large-scale applications of ALD CuO materials. Furthermore, CuO is deposited on TiO 2 nano-particles (forming CuO/TiO 2 composite) using this ALD process to evaluate its performance for H 2 evolution. The 0.37 wt % CuO/TiO 2 composite (120 cycles CuO/TiO 2 ) can achieve a H 2 evolution rate of 3995 μmol g –1 h –1 , which is nearly 200 times larger than pure TiO 2 .
研究领域:
材料科学
·
纳米科技
·
催化化学
·
能源材料
·
半导体薄膜
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 32
·10620-10629
·
IF 4.029
Songsong Li,Dongsheng Dai,Lei Ge,Yangqin Gao,Changcun Han,Nan Xiao
Novel layer-like Ni(OH)2 co-catalyst-decorated ZnIn2S4 microsphere photocatalysts were synthesized for the first time via a facile in situ deposition method to boost the photocatalytic H2-production performance. The physical and optical properties of the as-prepared Ni(OH)2–ZnIn2S4 composite samples were characterized via X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and surface photovoltage spectroscopy (SPV). The results indicate that the photocatalytic H2 evolution activity of the ZnIn2S4 microspheres under visible light irradiation significantly enhances by introducing inexpensive Ni(OH)2 as a co-catalyst. The 5 mol% Ni(OH)2–ZnIn2S4 sample shows the highest H2-production rate of 8.35 mmol g−1 h−1, which is 18 times higher than that of pure ZnIn2S4. Moreover, photocatalytic activity of the Ni(OH)2–ZnIn2S4 sample remains stable even after 4 cycling photocatalytic experiments. In addition, a possible mechanism on the enhanced photocatalytic activity was proposed and verified by surface photovoltage spectroscopy.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）