ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 50
·108538-108552
·
IF 5.8
Wang Yongqiang,Bai Yibo,Han Che,Li Zaimei,Lun Xiaowen,Zhang Conglu
Graphite-like carbon nitride (g-C 3 N 4 ) is favored for its excellent physicochemical properties. However, the high complexation rate of photogenerated carriers greatly limits its practical applications. Based on this, a novel CQDs-doped carbon nitride nanosheets composite (CNS/CQDs) was prepared and applied to the visible light–induced activation of peroxymonosulfate (PMS) for meloxicam (Mel) and tetracycline (TC) degradation. The photocatalytic degradation of Mel and TC were remarkably promoted in the CNS/CQDs+PMS+vis system. Mel photodegradation of 99.90% was achieved over 30 min with 20 mg CNS/CQDs and 20 mg PMS at pH11. And TC photodegradation of 95.97% was achieved over 45 min with 20 mg CNS/CQDs and 20 mg PMS at nature pH6.5. The TOC mineralization rates of Mel and TC were 75.49% and 52.00%, respectively. The transient photocurrent response and electrochemical impedance measurements (EIS) results indicated that the doping of CQDs could improve the charge transfer efficiency of pure g-C 3 N 4 , and CNS/CQDs had a low charge transfer resistance. Capture experiments and EPR tests explored the effective actives in the CNS/CQDs+PMS+vis system. Possible degradation pathways of Mel were also analyzed. This study provides valid residual drugs degradation under the dual conditions of visible light catalytic oxidation and persulfate oxidation, which will be a novel perspective for advanced oxidation technology to effectively remove organic pollutants from water.
研究领域:
环境科学
·
光催化化学
·
水处理技术
·
纳米材料
·
高级氧化工艺
·
药物代谢
·
环境污染物降解
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 19
·1900484
·
IF 10.856
Xiaosheng Tang,Weiwei Chen,Zhengzheng Liu,Juan Du,Zhiqiang Yao,Yi Huang,Cheng Chen,Zhaoqi Yang,Tongchao Shi,Wei Hu,Zhigang Zang,Yu Chen,Yuxin Leng
All-inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion-exchange reactions, and unsatisfactory stability. Here, the ultrathin, core–shell structured SiO 2 coated Mn 2+ doped CsPbX 3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX 3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well-controlled within 2 nm, which gives the CsPbMnX 3 @SiO 2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr 3 QDs with green emission and CsPbMnX 3 @SiO 2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light-emitting diode (LED) is successfully prepared by the combination of a blue on-chip LED device and the above perovskite mixture. The as-prepared white LED displays a high luminous efficiency of 68.4 lm W −1 and a high color-rendering index of Ra = 91, demonstrating their broad future applications in solid-state lighting fields.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
半导体物理
·
固体照明
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105292
·
IF 5.909
Jie Zhou,Wenyi Cai,Jing Ding,Hui Wan,Guofeng Guan
The appropriate construct of Z-scheme heterostructure composite with high photocatalytic activity has created new opportunities for environmental protection. Herein, graphitic carbon nitride quantum dots/tungsten trioxide (CNQDs/WO 3 ) was firstly fabricated using CNQDs decorated onto the surface of WO 3 nanorod grown along the [110] orientation in hydrothermal environment to construct a Z-scheme heterostructure composite. By various characterization methods, the crystal structure, micro morphology, atomic valence state and surface functional groups of the catalyst were systematically revealed. The results indicated that Z-scheme heterojunctions between CNQDs and WO 3 were successfully constructed. Compared with pure WO 3 , CNQDs/WO 3 exhibited prominent photoreduction performance under visible light irradiation. The optimal 5% CNQDs/WO 3 could reduce almost 100% Cr (VI) under acidic condition with the best photocatalytic activity within 90 min. More than this, 5% CNQDs/WO 3 also displayed excellent stability and recyclability even after five cycles of photoreduction experiments. Based on the free radical quenching experiments, the possible photoreduction reaction mechanism had been proposed in detail. The Z-scheme heterostructure provided the possibility of the generation, rapidly transfer and efficient separation of photogenerated electrons, which were major active species in the Cr (VI) photoreduction process.
研究领域:
环境催化
·
材料化学
·
纳米科技
·
光催化
·
环境污染治理
·
半导体异质结
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chang Chen,Kwok-ho Lam,Bao-jun Liu,Xian-hua Hou,Yu-ping Wu
Chemically integrated hybrid quantum dots ZnCo 2 O 4 /reduced graphene oxide (QDs ZCO/rGO) sheets nanocomposites are synthesized through polyol processes. rGO sheets grow and interweave to form basic skeletons. Ultrafine ZCO particles with a size of around 3.66 nm grow and embed on both sides of the rGO sheets, and the rGO sheets restrain the reunion of ZCO nanoparticles . The existence of rGO sheets and ZCO nanoparticles can engender the mutual synergistic effects so that hybrid QDs ZCO/rGO electrodes exhibit the excellent electrochemical properties . Owing to this special nanoparticles-on-sheets structure, the hybrid QDs ZCO/rGO electrodes exhibit an excellent initial discharge capacity for rechargeable lithium-ion batteries (1325.9 mAh g −1 at the current density of 200 mA g −1 ), high rate stability (532.3/566.1 mAh g −1 at 4000 mA g −1 ) and outstanding electrochemical cyclic stability (657.6/668.2 mAh g −1 at 2000 mA g −1 after 2000 cycles with a capacity retention of 68.6%). For full-cells, high initial reversible discharging capacity (646 mAh g −1 at 200 mA g −1 ) and good cyclic stability (514 mAh g −1 at 200 mA g −1 after 100 cycles) are obtained. The superior performance of the as-prepared electrodes is ascribed to the advantage of nano-sized particles. With the successful synthesis of hybrid QDs ZCO/rGO nanocomposites, the facile synthetic route and unique growth of nanostructuring method can be extended to high electrochemical performance electrodes for commercial lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 2
·1731-1736
·
IF 2.986
Jingbo Yu,Qian Zhang,Yi Gu,Anxian Lu
In this study, phosphate glasses embedded with Fe 2 O 3 quantum dots were prepared via a conventional melt quenching technology with further heat treatment. The effect of Fe 2 O 3 content on the structural, optical and magneto-optical properties was investigated. The results showed that the addition of Fe 2 O 3 had no obvious influence on the structure units that built up the host glass and the amorphous nature of glass. In the glass matrix , the existence of Fe 2 O 3 quantum dots was confirmed by high resolution transmission electron microscope . Meanwhile, optical study clearly demonstrated a red shift in optical cut-off wavelength resulted from the size quantization effect. The highest Verdet constant (22.33°/T-cm) was measured for the glass containing 1 mol% Fe 2 O 3 , which was ~ 7 times higher than that of the glass matrix. As the increment of Fe 2 O 3 contents, a phase evolution of Fe 2 O 3 quantum dots from amorphous phase to γ-Fe 2 O 3 phase was recorded due to the Ostwald Ripening effect. Interestingly, a concentration quenching phenomenon in Verdet constant was observed along with the phase evolution of Fe 2 O 3 quantum dots. When the content of Fe 2 O 3 is up to 2 mol%, the glass exhibited paramagnetism with the Verdet constant of − 2.833°/T-cm. This finding can provide a new idea for the development of quantum dot embedded magneto-optical glass.
研究领域:
材料科学
·
磁光材料
·
纳米材料
·
无机非金属材料
·
光学玻璃
·
凝聚态物理
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2016
·Vol. 59
·期 10
·833-841
·
IF 0
Shen Ting,Tian Jianjun,Li Bo,Cao Guozhong
TiO 2 nanocrystals are widely used in photoanodes for quantum dot solar cells (QDSCs) owing to their chemical stability and suitable energy band structure. However, surface defects and grain boundaries of TiO 2 nanocrystals photoanodes allow high surface charge recombination, which limits the performance of QDSCs. In this work, an ultrathin TiO 2 layer is introduced to the surface of TiO 2 photoanodes by atomic layer deposition (ALD). The ultrathin layer not only reduces the surface defects of TiO 2 nanoparticles and strengthens the connection between adjacent nanoparticles to suppress the charge recombination for improving the electron collection efficiency (η cc ), but also increases the surface energy of photoanodes to load more quantum dots (QDs) for enhancing the light harvesting efficiency (LHE). As a result, the solar cell based on CdS/CdSe QDs with ALD treatment exhibits an efficiency of 5.07% that is much higher than that of the cells without modification (4.03%).
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光伏技术
·
表面工程
·
半导体物理
·
光电转换
✓ 已验证
DOI
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·69
·
IF 2.533
Song Rong,Li Ying,Qian Jun
Perovskite has shown attractive optoelectronic performances and is a potential material in lighting, anti-counterfeiting, sensor, and other optoelectronic devices. Recently, spin-coating has been widely used in fabricating high-performance perovskite films, but it is difficult to process and apply in practice. In this paper, the CsPbBr 3 /Cs 4 PbBr 6 composite perovskite quantum dots with photoluminescence quantum yield of 36% and high storage stability were prepared by using room temperature ligand-assisted precipitation method and controlling the proportion of CsBr/PbBr 2 . In addition, the composite perovskite was ground and dispersed in the inks system. After adjusting the composition and ratio of the resin components, the inks were suitable for screen printing with a viscosity of 2439 mPa•s, an initial dryness of 25 mm/30 s, and a thorough dryness of 100 s/100 μm. By printing, the perovskite films exhibited high coverage, strong green emission, and outstanding fluorescence recovery ability after exposure to water. Screen printing perovskite inks have the characteristic of being patternable, which provides a solution for preparing a perovskite film in the application.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
印刷电子
·
荧光材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 21
·17029-17035
·
IF 3.289
Xiaoyu Zhang,Yu Zhang,Hua Wu,Long Yan,Zhenguang Wang,Jun Zhao,William W. Yu,Andrey L. Rogach
We explore two strategies to improve the performance of hybrid solar cells fabricated using poly(3-hexylthiophene) (P3HT) and colloidal PbSe nanocrystals, which have reached a 1 sun power conversion efficiency of 2.9%. Using an atomic passivation strategy towards inorganic ligand-capped nanocrystals, the electron mobilities of PbSe quantum dot films are improved from 1.95 × 10−6 cm2 V−1 s−1 to 1.15 × 10−5 cm2 V−1 s−1. Employing ultrasmall PbSe nanocrystals allows us to adjust their bandgaps towards the type II heterojunction with P3HT, thus achieving efficient charge separation and transfer between the polymer/inorganic constituents. The device performance dropped to half after 10 days' storage, and the P3HT/PbSe interface was found to play a primary role in this efficiency degradation.
研究领域:
材料科学
·
纳米科技
·
光伏技术
·
半导体物理
·
表面与界面化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 37
·15546-15552
·
IF 0
Yitan Li,Lin Wei,Cuncun Wu,Chang Liu,Yanxue Chen,Hong Liu,Jun Jiao,Liangmo Mei
Uniform zinc oxide (ZnO) nanosheet arrays were grown on woven titanium wires using a low temperature hydrothermal method. Photoanodes were prepared by depositing CdS and CdSe quantum dots onto the ZnO nanosheet arrays by a successive ionic layer adsorption and reaction (SILAR) method. Solar cells were assembled using these nanostructured photoanodes and their photovoltaic performance was characterized. The effect of using SILAR cycles for the deposition of quantum dots on the performance of these nanostructured solar cells was investigated systematically. The overall light-to-electricity conversion efficiency of 0.98% was achieved under 100 mW cm−2 illumination for flexible CdS/CdSe co-sensitized solar cells using conventional Pt foils as counter electrodes. To further improve the performance of the flexible solar cells, PbS and Cu2S counter electrodes based on Pb and Cu foils were fabricated. The best conversion efficiencies of flexible CdS/CdSe co-sensitized solar cells using Cu2S and PbS counter electrodes were 3.4% and 2.5%, which demonstrated a significant enhancement in values for short circuit current, open circuit voltage, and fill factor compared to those obtained with the commonly used Pt and Au electrodes.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
光电化学
·
半导体器件
✓ 已验证
DOI
TALANTA
·
2018
·
IF 4.244
Yucan Che,Hongyu Pang,Huiyu Li,Lei Yang,Xinyao Fu,Shiqi Liu,Lan Ding,Juan Hou
Fluorescent carbon quantum dots are emerging as a new class of fluorescent probes due to their unique optical properties . Herein, we presented a simple, one-pot and effective preparation strategy for copper-functionalized carbon quantum dots (Cu-CDs). The Cu-CDs demonstrated excitation-independent emissions, high fluorescent quantum yield (~ 24.4%) and excellent fluorescent stability. The fluorescence of Cu-CDs could be quenched efficiently in the presence of histidine (His) due to the coordination occurring between surface Cu and imidazole side chains of His. Thus, the Cu-CDs could be used as an efficient fluorescent probe for His detection. Under optimal conditions, the fluorescent signals of Cu-CDs decreased linearly with the concentrations of His over a range of 0.1–15 µM. The detection limit was 30 nM. The proposed method provided obvious advantages of rapid response, convenience, simplicity, high selectivity and sensitivity. Moreover, good results also have been obtained for His detection in real biological fluid samples.
研究领域:
材料科学
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lu-Yu Cao,Shuai-Chen Si,Jin-Bo Yu,Chong-Geng Ma,Jian-Bei Qiu,Jing Wang
Optical ions doped transparent glasses have attracted more and more attention because of their potential application in photonic applications. Unfortunately, optically active dopants occupy at non-crystalline coordination environment, which leads to their poor luminescence efficiency. Therefore, how to enhance luminescence efficiency of optically active dopants in glasses remains a great challenge. Here, we proposed a precisely space-separated strategy of donor-acceptor and successfully developed an intense red emitting composite borosilicate glass co-doped with CsPbCl 3 quantum dots and Mn 2+ ions. By rationally controlling post heat-treatment, CsPbCl 3 QDs acting as donor were uniformly precipitated in glass and Mn 2+ ions acting as acceptor are close to CsPbCl 3 QDs but not inside CsPbCl 3 QDs. Benefitted from high absorption efficiency of CsPbCl 3 QDs and efficient energy transfer from CsPbCl 3 QDs to Mn 2+ ions in glasses, Mn 2+ ions give an intense red broadband emission at 650 nm, 11 times as intense as the one without CsPbCl 3 QDs. The optimal external quantum yield of the as-synthesized composite borosilicate glass is estimated to be 28.5%, 9.5 times as large as 3% for the one without CsPbCl 3 QDs. The precise space-separation and energy transfer rate dependent non-radiative energy coupling mechanism was reasonably proposed to explain how CsPbCl 3 QDs highly absorb energy, efficiently transfer it and finally feeding Mn 2+ ion. These results demonstrate that the strategy of using microcrystalline with high absorption efficiency as donor, for instance, CsPbX 3 QDs, to pump optical activator ions as acceptor, for instance, Mn 2+ ion in glass may be very promising for developing high luminescent performance ions-doped transparent glasses.
研究领域:
光子学
·
材料科学
·
光学材料
·
发光材料
·
量子点
·
能量传递
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Weitao Su,Jiake Li,Fei Chen,Li Fu,Su Ding,Shichao Zhao,Qi Zhang,Yunhua Gao
Two-dimensional (2D) monolayer (1L) transition metal dichalcogenides (TMDs) suffer from low absorption in the visible light region. Nonradiative energy transfer (NRET) is an effective method to enhance such absorption, which, as shown in this study, can be accomplished by using surface nitridized carbon quantum dots (CQDs). The optical absorption and photoluminescence (PL) of CQDs in the visible light region can be greatly enhanced by increasing the level of nitridization. The nitridized CQDs exhibit weak p-type doping but strong PL quenching in contact with vapor transport (VT)-deposited 1L-WS2. Owing to the good overlap between the fluorescence and absorption spectra for CQDs and 1L-WS2, an interactive NRET process reduces the PL lifetimes of both CQDs and 1L-WS2. The NRET efficiency can be greatly enhanced by up to 73% for samples coated with CQDs of increasing surface nitridization.
研究领域:
纳米材料
·
光电子学
·
能量转移
·
量子点
·
二维材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）