ChemistrySelect
·
2022
·Vol. 7
·期 33
·e202202124
·
IF 2.307
Qingqing Zhang,Zhicheng Sun,Qingwei Guo,Yang Zhou,Zhenzhen Li,Jinyue Wen,Furong Li,Yuanyuan Liu,Shouzheng Jiao
Graphical The combination of photosensitive dyes and phase change microcapsules significantly improves the efficiency of photothermal conversion. The dye converts light energy into heat, which is stored in phase-change microcapsules and released when needed. The heat storage slurry doped with copper phthalocyanine and MXene have the best photothermal conversion performance and are expected to become a novel kind of heat collecting medium. Most solar thermal utilization materials can only absorb ultraviolet irradiation rather than visible-light, limiting the photothermal conversion efficiency of corresponding devices. In this work, a functional thermal slurry system with excellent visible-light absorption and high photothermal conversion performance is developed based on the phase change microcapsules, incorporating the visible-light absorption antenna in the shell structure. Specifically, a phase change microcapsule with paraffin as the core material and silica as the wall material is prepared by the in-situ polymerization method, in which the shell layer is doped with various photosensitive molecules. The photothermal conversion efficiency of copper phthalocyanine and MXene can reach 98 % and 85.3 % respectively. The corresponding conversion efficiency could reach up to more than 80 % in a long temperature range. Therefore, the doping of photosensitive molecules with visible-light absorption can promote the solar energy conversion efficiency of these solar thermal utilization materials.
研究领域:
材料科学
·
太阳能利用
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yanyan Peng,Dayong Jiang,Man Zhao,Yuhan Duan,Haoming Wei,Haoda Li,Qingcheng Liang,Shiwei Wang
In recent years, the combination of perovskite with other materials to improve the optoelectronic performance and detection range has received widespread attention. In this paper, ZnO/perovskite heterostructure photodetectors were prepared by sputtering and sol-gel spin-coating method. ZnO/perovskite photodetector exhibits superior photoelectric performance over a wide detection range from UV to visible compared to ZnO and perovskite photodetector. Under 360 nm illumination, the detection performance is higher than ZnO and perovskite photodetector, with responsivity of 2.73 A/W, light-to-dark current ratio of 5.88 × 10 4 , a detectability of 1.09 × 10 12 Jones, and an external quantum efficiency of 940.86 %. Meanwhile, perovskite combined with ZnO, the device has higher light-to-dark ratio, responsivity and detectivity than perovskite photodetector in the visible region of 550 and 750 nm. The heterojunction formed by ZnO and perovskite, which has a built-in electric field, thus reducing the dark current , reducing carrier recombination and enhancing the photovoltaic performance . The responsivity of the device slightly decreases after being placed in the atmosphere for 10 days. This study provides a basis for the preparation of heterojunction photodetectors with high optoelectronic performance.
研究领域:
材料科学
·
光电子学
·
半导体物理
·
纳米科技
·
器件物理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Pei-Wen Chen,Kui Li,Yu-Xiang Yu,Wei-De Zhang
Cobalt-doped graphitic carbon nitride (Co CN) was synthesized by one-step thermal polycondensation using cobalt phthalocyanine (CoPc) and melamine as precursors. The π-π interaction between melamine and CoPc promotes cobalt doping into the framework of g-C 3 N 4 . The prepared samples were carefully characterized and the results demonstrated that Co-doped graphitic carbon nitride inhibited the crystal growth of graphitic carbon nitride (CN), leading to larger specific surface area (33.1 m 2 g −1 ) and abundant Co-N x active sites, narrower band gap energy and more efficient separation of photogenerated electrons and holes. 0.46% Co CN exhibited higher hydrogen evolution rate (28.0 μmol h −1 ) under visible light irradiation, which is about 3.0 times of that over the pure CN and about 2.2 times of that over cobalt-doped CN using CoCl 2 ∙ 6H 2 O as a cobalt source. This study provides a valuable strategy to modify CN with enhanced photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体物理
·
环境功能材料
·
可持续能源
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Xue-Dong Xiao,Lin Shi,Li-Hui Guo,Jun-Wen Wang,Xiang Zhang
The supramolecular interaction between the water-soluble pillar[5]arene (WP[5]) as host and dopamine hydrochloride (DH) as guest was studied by spectrofluorometry . The fluorescence intensity of DH gradually decreased with increasing WP[5] concentration, and the possible interaction mechanism between WP[5] and DH was confirmed by 1 H NMR, 2D NOESY , and molecular modelling. Based on significant DH fluorescence, a highly sensitive and selective method for DH determination was developed for the first time. The fluorescence intensity was measured at 312 nm, with excitation at 285 nm. The effects of pH, temperature, and reaction time on the fluorescence spectra of the WP[5]-DH complex were investigated. A linear relationship between fluorescence intensity and DH concentration in the range of 0.07–6.2 μg mL − 1 was obtained. The corresponding linear regression equation is Δ F = 25.76 C + 13.56 (where C denotes the concentration in μg mL − 1 ), with the limit of detection equal to 0.03 μg mL − 1 and the correlation coefficient equal to 0.9996. This method can be used for the determination of dopamine in injection and urine samples. In addition, the WP[5]-DH complex has potential applications in fluorescent sensing and pharmacokinetics studies of DH.
研究领域:
分析化学
·
超分子化学
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药物代谢
·
生物分析
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药代动力学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 20
·1900774
·
IF 7.125
Xin Zhang,Dengbao Han,Chenhui Wang,Imran Muhammad,Feng Zhang,Ali Shmshad,Xulan Xue,Wenyu Ji,Shuai Chang,Haizheng Zhong
The in situ fabricated perovskite nanocrystals (PNCs) obtained through spin-coating a precursor solution are suitable candidates to achieve efficient perovskite light emitting diodes (PeLEDs). In this work, the solvent effects of on-chip crystallization are investigated by correlating the nucleation and growth process of in situ fabricated formamidinium lead iodide (FAPbI 3 ) nanocrystals with their optical and electronic properties. The FAPbI 3 nanocrystals obtained from a precursor solution in γ-butyrolactone (GBL) are smaller than those obtained from N , N -dimethylformamide and dimethyl sulfoxide, and the relatively weak coordination between GBL and the precursor molecules enables reduced defect states in the resulted PNCs with enhanced photoluminescence properties. A modified LaMer model is proposed to describe the solvent effects in the on-chip crystallization process. Based on these understandings, red emissive FA 0.87 Cs 0.13 PbI 3 nanocrystal films with absolute photoluminescence quantum yields up to 70% are realized. Finally, an efficient PeLED with maximum luminance of 218 cd m −2 and peak external quantum efficiency of 15.8% is achieved with good reproducibility.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
半导体器件
·
凝聚态物理
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400447
·
IF 9.8
Fangyi Zhao,Yuhe Shao,Quanlin Liu,Jiasong Zhong
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) light sources in the second NIR window (NIR-II, 1000–1700 nm) have sparked great interest for their emerging applications in non-destructive detection and medical diagnostics fields. However, the development of efficient NIR-II phosphors that can be excited by commercial blue LED chips remains a significant challenge, and thus impeding the applications of NIR pc-LED. Herein, a blue-light-excitable broadband NIR-II luminescence of Ni 2+ is achieved upon incorporating Cr 3+ and Ni 2+ into the Ca 3 Ga 2 Ge 3 O 12 (CGGO) host simultaneously. Through the energy transfer from Cr 3+ to Ni 2+ , CGGO:Cr 3+ ,Ni 2+ phosphor presents the improved NIR-II emission peaking at 1470 nm under 460 nm blue light excitation. The internal/external quantum efficiency values are significantly improved from 13.8%/3.3% to 24.6%/13.3% along with the enhanced luminescence thermal stability. Finally, a NIR pc-LED is fabricated by combining CGGO:Cr 3+ ,Ni 2+ phosphor with 450 nm blue chip, and its potential applications in non-destructive examination and biomedical imaging fields have been demonstrated. The strategy of Cr 3+ and Ni 2+ co-doping solves the problem that Ni 2+ luminescence cannot be effectively excited by blue light and provides the design insights to exploit more ultra-broadband NIR pc-LEDs based on blue LED chips.
研究领域:
材料科学
·
生物医学工程
·
光学成像
·
非侵入性检测
·
分子影像学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yongsheng Yang,Siyuan Tang,Da Chen,Changxing Wang,Bingli Gu,Xiameng Li,Feng Xie,Gang Wang,Qinglei Guo
In this study, red-emission graphene quantum dots (R-GQDs), with tunable emission wavelength , are synthesized and explored for applications in trace water sensing, white light emitting diodes (WLEDs) and information encryption . Systematic experiments and characterizations demonstrate that the as-fabricated R-GQDs possess homogeneous size, good crystallinity and high doping concentration of nitrogen and oxygen. Moreover, tunable multicolor light emissions of R-GQDs are demonstrated by simply adjusting the polarity of surrounding solvents. As a result, solid-state fluorescence films are successfully fabricated to construct a high-quality WLED, with the CIE (Commission International d′Eclairage) coordinates (0.352, 0.380) and color temperature of 5121 K. Besides, the water quenchable fluorescence of R-GQDs enables the fabrication of a trace water sensing platform, with the low detection limit of 0.034%. Finally, the potential of our prepared R-GQDs for the application in color visual information encryption is developed. This study may pave the way for the development of GQDs, especially in optically sensing, optoelectronics and anti-counterfeiting technology.
研究领域:
纳米材料学
·
光学传感
·
光电子学
·
分析化学
·
防伪技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Guanghao Li,Yang Zhao,Jiao Xu,Zhiyong Mao,Jingjing Chen,Dajian Wang
Two strategies, deviation of stoichiometry and addition of flux, were employed in this work to suppress the emergence of AlN impurity in the synthesis of CaAlSiN 3 :Eu 2+ phosphors under condition of atmospheric pressure. The influence of Al atoms deviation from ideal stoichiometry and SrF 2 flux addition on the suppression of AlN impurity and their resultant photoluminescence properties are investigated for CaAlSiN 3 :Eu 2+ phosphors. For a special Eu 2+ doping concentration (0.02 mol), AlN impurity was suppressed effectively when Al element deviation is 0.2 mol (CaAl 0.8 SiN 3 ) and the SrF 2 flux addition is 7 wt% during preparation of CaAlSiN 3 :Eu 2+ phosphors, respectively. The luminescent properties of CaAlSiN 3 :Eu 2+ phosphors are found to be enhanced significantly owing to the suppression of AlN impurity. In addition, the suppression mechanisms of AlN impurity in atmospheric pressure-synthesized CaAlSiN 3 :Eu 2+ phosphors are discussed. These results indicate the promising prospect for our proposed strategies in preparing high performance CaAlSiN 3 :Eu 2+ phosphors under the condition of atmospheric pressure.
研究领域:
材料科学
·
无机化学
·
固体发光
·
功能材料
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yunkang Bu,Yu Chen,Xingyue Chen,Yichun Zhang,Degang Deng,Yuyu Shen,Liuyan Zhou,Chenwei Xu
Up conversion luminescent materials Sr 2 YTaO 6 : Er 3+ , Yb 3+ phosphors were prepared by high temperature calcination . In view of the formation, temperature characteristics , and photoluminescence features of the sample, X-ray diffraction and photoluminescence were used. Under the excitation at 980 nm, the series of samples is significantly stimulated by Er 3+ up-conversion luminescence and Yb 3+ sensitization at 524, 550 and 659 nm. According to the diversity of temperature sensing performance from these three highest peaks, a dual-mode temperature sensor on account of fluorescence intensity ratio (thermally coupled level between 2 H 11/2 and 4 S 3/2 , and nonthermally coupled energy levels between 2 H 11/2 and 4 F 9/2 ) is achieved by using a single luminescent center. Moreover, the phosphor has strong thermal stability, which is helpful to improve the accuracy of temperature measurement. Under the temperature measurement of a dual-mode temperature sensor, it is calculated that the optimal absolute sensitivity S a of thermally coupled energy level is 0.78 × 10 −3 K −1 (473 K) and relative sensitivity S r is 1.32 %K −1 (293 K), and the maximum optimal absolute sensitivity S a of non-thermally coupled energy level is 1.02 × 10 −4 K −1 (473 K) and relative sensitivity S r is 0.58 %K −1 (293 K). All results imply that Sr 2 YTaO 6 : Er 3+ , Yb 3+ phosphors are promising materials for self-referenced optical temperature measurement.
研究领域:
材料科学
·
光学工程
·
无机化学
·
功能材料
·
生物医学传感
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Nan Zhao,Kangjie Zhang,Yuexiang Lu,Shuang Liu,Zhe Wang,Xiangke Wang
The photocatalytic method has been proven as one of the effective methods for uranium removal from radioactive wastewater. Herein, a photocatalyst UiO-66-NH 2 -Pt was prepared using the adsorption-photoinduction method. Pt was first adsorbed on the substrate and then photo-reduced under light irradiation to be doped into the structure of UiO-66-NH 2 . The characterization results implied the formation and atomic dispersion of Pt with a loading content of 1.90 wt%. The loading of Pt has promoted the effective separation and transfer of photogenerated electron-hole pairs, broadened the visible light adsorption range and narrowed down the bandgap, thus to enhance the photocatalytic activity. Then they were applied for the photo-removal of uranium under air atmosphere. The reaction rate of UiO-66-NH 2 -Pt was about 7 times that of pure UiO-66, confirming the higher photocatalytic activity after the loading of Pt. It showed good reusability and was also universal for different water matrix. The detection of hydroxyl radicals with EPR method indicated the formation of H 2 O 2 , which could react with uranyl ions to form metastudtite under air. This work further verified the feasibility of photoinduced synthesis of Pt single atom and provided a novel material for photocatalytic removal of uranyl ion under air.
研究领域:
环境科学
·
材料科学
·
核工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Chengxin Wu,Wei Wang,Feifei Quan,Pengfei Chen,Jiali Qian,Lei Zhou,Qiaosheng Pu
Curcuminoids, the major bioactive constituents of traditional medicine known as turmeric, have exhibited extensive therapeutic benefits. Excited by violet-blue light, curcuminoids can emit native fluorescence, making them possible to be detected with high sensitivity and specificity by laser-induced native fluorescence (LINF). Here, a commercial 445 nm laser diode was used as an excitation source to construct a confocal laser-induced fluorescence (LIF) detector and then a complete capillary electrophoresis (CE) system coupled with LIF detection was established. With three major curcuminoids, curcumin, demethoxy curcumin (DMC) and bisdemethoxy curcumin (BDMC) as target analytes, a micellar electrokinetic chromatography (MEKC) method was proposed using mixed micelles consisting of Triton X-100 and SDS to sensitize the native fluorescence of curcuminoids and enhance their separation efficiency. Fluorescence spectra revealed that the mixed micelles induced fluorescence synergism could enhance the signals of three curcuminoids by 77-, 57-, and 47-fold for curcumin, DMC, and BDMC. After systematic investigation, the optimal separation buffer for curcuminoids was chosen as follows: 20 mM Triton X-100, 20 mM SDS, 30% (v/v) methanol in 10 mM borax solution at pH 10.0. Under these conditions, a baseline separation of three curcuminoids was achieved within 10 min and the detection limits were found to be 4.1, 2.6, and 0.4 ng/mL for curcumin, DMC, and BDMC, respectively. Furthermore, the developed MEKC-LINF method was validated in terms of precision, linearity, accuracy and successfully applied for the determination of three curcuminoids in turmeric, medicinal turmeric liniment, curry seasoning, and human urine samples.
研究领域:
分析化学
·
药理学
·
生物医学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Hongyan Yin,Can Zhang,Quanzhen Zhang,Pu Wang,Jianguo Tang,Sui Mao
Metallic nanoparticles can generate photoexcited hot carriers on the femtosecond scale under light excitation, which holds immense significance for applications such as optical communication and ultrafast imaging. In this study, a tunnelling junction structure with ZrO2 as the dielectric layer is designed and fabricated to achieve efficient hot hole collection between Au nanoparticles and P-type Si. Through characterizations of photoconductive atomic force microscopy, the electrical transition from an ohmic contact to a tunneling junction is confirmed, and the transfer pathway of Au hot holes to P-type Si upon 520 nm excitation is clearly observed. The impact of the tunneling structure on device performance is investigated through the fabrication of Si/ZrO2/Au/TiO2 photodiodes. The performance tests show that hot hole collection by the tunneling effect significantly enhances a range of parameters, e.g., external quantum efficiency by 250%. Noticeably, the external quantum efficiency attributed to photogenerated hot carriers under 520 nm excitation is estimated to exceed 2.5%. Moreover, the transient photoresponse of the photodiodes is examined with a typical rising time of less than 20 ns.
研究领域:
光电子学
·
纳米光子学
·
固态物理
·
材料科学
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）