OPTICS EXPRESS
·
2017
·Vol. 25
·期 16
·19065-19076
·
IF 3.307
Qi Ding,Xiaosong Zhang,Lan Li,Xiabing Lou,Jianping Xu,Ping Zhou,Ming Yan
Quantum dots (QDs) exhibit not only wide tunability of luminescence but also complex optical properties because of the large degree of freedom in their structure and chemical composition. Quaternary ZnxAgInSe QDs with different Zn/Ag ratios were synthesized and examined as temperature sensors. The relationship among the luminescence energy, emission intensity, and full-width at half-maximum (FWHM) of the emission band at different temperatures was investigated. To understand the photoluminescence mechanism, time-resolved photoluminescence spectra were recorded. Moreover, the dependence of the luminescence peak energy and FWHM on temperature was investigated, and a small deviation from the actual temperature was observed, indicative of the use of ZnxAgInSe QDs as high sensitivity temperature sensors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 3
·1841-1855
·
IF 6.123
Shuaib Suhaib Shuaib Adam,Niu Zixuan,Qian Zhiyi,Qi Shengyang,Yuan Weizhong
The development of phase change materials (PCMs)-based energy storage devices for both thermal and light energy has the potential to greatly enhance solar energy use efficiency, which is important in addressing the worldwide energy problem. Due to the environmentally friendly, good thermal and chemical stability, easy degradation, and good mechanical strength of ethyl cellulose, it was used to fabricate the shape-stabilized composite phase change material (ss-CPCM) with polyethylene glycol. The ss-CPCMs have a high latent enthalpy (174.33 J/g), high form stability, excellent thermal regulation abilities for both thermal energy storage and thermal insulation, and great cycle thermal performance. After adding long afterglow luminescence particles, the self-luminous ss-CPCMs were obtained. They can absorb and store visible and ultraviolet light, as well as emit green light in the dark for an extended period of time. The excellent properties of the self-luminous ss-CPCMs promise them great potential in applications, such as energy-saving, emergency lighting, furniture, smart building, and smart highway.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2010
·
IF 1.566
Hongqi Chen,Cailing Zhou,Lun Wang,Jingguo Chen,Bo Ling,Jie Fu
The sensitized fluorescence intensity of the terbium (III) ion can be notably enhanced in the presence of sodium hexametaphosphate (SHMP). Based on this, water-soluble Tb-SHMP chelate complexes were synthesized in aqueous solutions, and characterized by spectrofluorometry. 6-Mercapto-5-triazole[4,3-b]-S-tetrazine was generated by the quantitative reaction of HCHO with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole under alkaline conditions at room temperature . The spectral overlap between the emission of Tb-SHMP chelate complexes and absorption of 6-mercapto-5-triazole[4,3-b]-S-tetrazine meets the prerequisite for fluorescence energy transfer . Based on this, a novel efficient fluorescence energy transfer system between Tb-SHMP chelate complexes as donor and 6-mercapto-5-triazole[4,3-b]-S-tetrazine as acceptor was developed for the determination of HCHO in aqueous solutions. Under the optimal experimental conditions, this method is capable of detecting HCHO concentrations from 2.06 × 10 −5 to 6.18 × 10 −3 mg mL −1 and the limit of detection was 7.11 × 10 −6 mg mL −1 . Compared with other general methods for the determination of HCHO, the proposed method improved the sensitivity and selectivity. Moreover, the proposed method was successfully applied to the determination of HCHO in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Lin Li,Dawei Tang,Yongchen Song,Bo Jiang
Optofluidic microreactors are promising platform for photocatalytic reactions. However, the light transmission phenomenon is serious in optofluidic microreactors which makes a part of solar energy lose in surroundings. To resolve this problem, in this work, a novel dual-film optofluidic microreactor is proposed and fabricated by immobilizing TiO 2 nanorod arrays on both the top and bottom internal wall of the microchamber. Such dual-film structure enables the transmitted light to be utilized by the bottom TiO 2 film instead of being wasted, thus improving the light-harvesting capacity of optofluidic microreactor. Moreover, TiO 2 nanorod arrays are employed as the photocatalytic film in this optofluidic microreactor to enlarge the specific surface area and facilitate the mass transfer. The photocatalytic performance and the kinetic properties of the dual-film optofluidic microreactor are evaluated by photocatalytic degradation of methylene blue. Results show that the proposed dual-film optofluidic microreactor yielded much higher degradation efficiency than the conventional one as a result of enhanced light-harvesting and improved mass transfer. In addition, the long-term testing proves that the durability of the dual-film optofluidic microreactor can be improved by operating it in a periodically rotated manner. In short, the TiO 2 nanorod arrays-based dual-film optofluidic microreactor exhibits efficient light-harvesting and high durability and shows promising potential for photocatalytic applications.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Zhao-Yun Wang,Lei Jin,Jia-Qiang Yang,Yi Zhao,Tao Song,DongPing Zhan,Da-quan Yu,Fang-Zu Yang,Shi-Gang Sun
The uniform thickening of high aspect ratio (AR) through-holes (HAR-TH, AR: 10–12:1) by Cu electronic plating (Cu-EP) is essential in printed circuit boards fabrication, and is often accomplished with organic levelers and at low current densities (6–15 mA/cm 2 ). Nevertheless, the organic levelers are often unstable and the Cu-EP at low current densities presents low production efficiency. In this study, we demonstrate that inorganic compound sodium azide (SAD) can act as a novel leveler in acidic Cu-EP for achieving uniform thickening of HAR-THs (AR: 12:1) even at a high current density of 20 mA/cm 2 . The throwing power using SAD for HAR-THs (AR: 12:1) thickening reaches as high as 94.7 %. Galvanostatic measurements and cyclic voltammetry tests on Pt rotating disk electrode (Pt-RDE) reveal that the competitive adsorption among the three additives of SAD, PEG and SPS occurs only at high rotating rate, referring to a strong inhibition of cupric ions reduction at violent convection area of the HAR-THs mouth. In situ FTIR spectroscopy analyses combined with DFT theoretical calculations illustrate that the synergistic effect of SAD and PEG is manifested by the formation of a PEG-SAD co-adsorption layer. The key to achieving uniform thickening lies in the difference in competitive adsorption abilities between the PEG-SAD co-adsorbed layer and SPS at both mouth and middle part of the HAR-THs. The PEG-SAD co-adsorption layer occupies all active sites of the HAR-THs mouth, preventing SPS from adsorption and thus reducing Cu deposition rate. However, the SPS firmly occupies active sites of middle part of the HAR-THs, facilitating to maintain a consistent Cu deposition rate inside the HAR-THs, consequently achieving uniform Cu thickening of the HAR-THs.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Yingfeng Xu,Ping Lu,Lisong Chen,Chen Zhang,Lingxia Zhang,Xiaohua Zhang,Jianlin Shi
Photoenergy storage catalyst, conventionally constructed by combining a light harvesting component with a charge-storage material, could store partial of photoexcited charge carriers (e − /h + ) under illumination and release them in dark, which is regarded as one of the most promising strategies to compensate the fluctuating availability of solar energy. However, the charge storage efficiency of most reported heterojunctions is quite limited due to the interfacial defects that would quickly quench the photoexcited e − /h + pairs and hinder the charge transfer. Here, through precisely regulating the hydrolysis and condensation kinetics of titanic and molybdate chemical compounds, {Mo(VI)O x } component was incorporated into TiO 2 matrix to construct an artificial atomic-scale heterojunction for photoenergy storage (denoted as Mo-TiO 2 ). In contrast to the conventional nano-scale heterojunction, the absence of defined interfaces in Mo-TiO 2 enables an improved transfer of photoexcited electrons from TiO 2 to {Mo(VI)O x }, leading to an efficient photoenergy storage process under illumination. Then, the stored electrons can spontaneously be released after light turning-off, achieving a dark-continued catalytic activity . The present atomic-scale heterojunction strategy may open up a new dimension for the design and construction of practical photoenergy storage systems.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Wenjun Zhou,Yanjian Wang,Chunhua Ni,Liangmin Yu
Currently, it is highly desirable to develop a novel antifouling resin with a controllable hydrolysis rate and stable and effective antifouling performance for marine antifouling coatings. In our study, we prepared natural rosin-based zinc (RZn-x) resins by a relatively facile and green synthetic method from Zn(OH) 2 and antimicrobial natural rosin, which is considered a toxicity-free raw material, thus ensuring the green and antimicrobial character of the material. In their optimal combination, the RZn-x coating surface exhibited ideal peeling behaviour upon immersion in seawater, which caused the WCA of the material surface to change from 55° before immersion to 135° after immersion for 60 days and enhanced the antifouling properties. Dynamic simulation experiments of these resins also demonstrated that the hydrolysis rate of this material immersed in dynamic seawater was related to the zinc content, and we could control the self-polishing ability of the resins by adjusting the content of Zn(OH) 2 participating in the reaction. Moreover, hydrolysis led to a hydrophobic surface, which could prevent fouling organisms from adhering. Laboratory bioassays against BSA adsorption (immersed for 4 h: 1.986 μg/cm 2 ), bacterial (over 95 % reduction) and marine algal adhesion (more than 60 % reduction) revealed outstanding anti-protein, bacteriostasis and anti-algal growth and adhesion properties compared to pure rosin and the control sample. The long-term antifouling capability in marine field tests indicated that the RZn-x resins maintained their antifouling activity for more than 6 months, especially RZn-50, which showed excellent antifouling performance.
研究领域:
材料科学
·
海洋生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2021
·Vol. 118
·期 42
·e2104481118
·
IF 11.205
Jintao Tong,Dalei Wang,Ye Liu,Xin Lou,Jiwei Jiang,Bin Dong,Renfeng Dong,Mingcheng Yang
In nature, microorganisms could sense the intensity of the incident visible light and exhibit bidirectional (positive or negative) phototaxis. However, it is still challenging to achieve the similar biomimetic phototaxis for the artificial micro/nanomotor (MNM) counterparts with the size from a few nanometers to a few micrometers. In this work, we report a fuel-free carbon nitride (C3N4)/polypyrrole nanoparticle (PPyNP)-based smart MNM operating in water, whose behavior resembles that of the phototactic microorganism. The MNM moves toward the visible light source under low illumination and away from it under high irradiation, which relies on the competitive interplay between the light-induced self-diffusiophoresis and self-thermophoresis mechanisms concurrently integrated into the MNM. Interestingly, the competition between these two mechanisms leads to a collective bidirectional phototaxis of an ensemble of MNMs under uniform illuminations and a spinning schooling behavior under a nonuniform light, both of which can be finely controllable by visible light energy. Our results provide important insights into the design of the artificial counterpart of the phototactic microorganism with sophisticated motion behaviors for diverse applications.
研究领域:
纳米技术
·
生物物理学
✓ 已验证
DOI
PubMed
高影响因子
ENERGY
·
2019
·
IF 5.537
Liang Jiang,Yuan Lei,Qinfeng Liu,Jingxin Lei
Except for the improvement enthalpy value and thermal conductivity of conventional solid-solid phase change materials (SSPCMs), expansion of additional functions other than thermal energy storage function of that has been particularly attractive. In this work, a novel self-luminous SSPCMs based polyethylene glycol have been successfully synthesized via incorporation of long afterglow luminescence (LAL) particles into SSPCMs in the absence of any isocyanates and solvents. The prepared self-luminous SSPCMs have high melting latent heats with a maximum value at 120.2 J g −1 , maximum encapsulation ratio of 80.6%, and a suitable phase change temperature around 28 °C. Importantly, the prepared self-luminous SSPCMs with different concentrations of LAL particles can absorb and store visible light sources in the daylight but can slowly release blue light in the dark over a long time. Furthermore, the prepared self-luminous SSPCMs after thermal cycling tests and storing-releasing light energy cycling tests have preeminent thermal reliability, luminescence repeatability and chemical structure reliability for a long time practical application.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2012
·
IF 2.823
Feng Gao,Qingqing Ye,Peng Cui,Lu Zhang
We here report an efficient and enhanced fluorescence energy transfer system between confined quantum dots (QDs) by entrapping CdTe into the mesoporous silica shell (CdTe@SiO2) as donors and gold nanoparticles (AuNPs) as acceptors. At pH 6.50, the CdTe@SiO2–AuNPs assemblies coalesce to form larger clusters due to charge neutralization, leading to the fluorescence quenching of CdTe@SiO2 as a result of energy transfer. As compared with the energy transfer system between unconfined CdTe and AuNPs, the maximum fluorescence quenching efficiency of the proposed system is improved by about 27.0%, and the quenching constant, Ksv, is increased by about 2.4-fold. The enhanced quenching effect largely turns off the fluorescence of CdTe@SiO2 and provides an optimal “off-state” for sensitive “turn-on” assay. In the present study, upon addition of melamine, the weak fluorescence system of CdTe@SiO2–AuNPs is enhanced due to the strong interactions between the amino group of melamine and the gold nanoparticles via covalent bond, leading to the release of AuNPs from the surfaces of CdTe@SiO2; thus, its fluorescence is restored. A “turn-on” fluorimetric method for the detection of melamine is proposed based on the restored fluorescence of the system. Under the optimal conditions, the fluorescence enhanced efficiency shows a linear function against the melamine concentrations ranging from 7.5 × 10–9 to 3.5 × 10–7 M (i.e., 1.0–44 ppb). The analytical sensitivity is improved by about 50%, and the detection limit is decreased by 5.0-fold, as compared with the analytical results using the CdTe–AuNPs system. Moreover, the proposed method was successfully applied to the determination of melamine in real samples with excellent recoveries in the range from 97.4 to 104.1%. Such a fluorescence energy transfer system between confined QDs and AuNPs may pave a new way for designing chemo/biosensing.
研究领域:
分析化学
·
纳米技术
·
生物传感
✓ 已验证
DOI
高影响因子
Matter
·
2022
·
IF 19.967
Jin Zhao,Yinghao Zhang,Yifan Jia,Lixia Bao,Lijun Yang,Siyu Xiao,Jiaying Xie,Jiliang Wang
Metal and inorganic or organic conjugate semiconductors can convert solar energy into electricity through the well-known external photoelectric effect and internal photovoltaic effect, respectively. The photoelectric effect cannot be detected in electron-insulated polymers due to a lack of free electrons or the redistribution of holes and electrons under illumination. Here, we report a subtle method to efficiently convert UV-light energy into electricity for electron-insulated co-polymers via a photomechaelectric (PME) effect, in which a PME effect means that photo induces isomerization of photosensitive segments and further results in generating dynamic dipoles and equal amounts, but opposite signs, of induced charges at electrodes. To this aim, functional azobenzene (AZO) and imidazole ionic liquid (ILO) oligomers have been used as photoisomer and dipole units, respectively. The produced electron-insulated AZO- co -ILO co-polymer-based nanogenerator can directly output an alternating current (up to 5.8 V and 247 μA) under UV illumination, implying extensive potential applications in self-powered electronic devices.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 7
·e4829
·
IF 3.2
Juanjuan Cheng,Xinru Wei,Lun Wang,Hongqi Chen
A ratio luminescence probe was developed for detecting Staphylococcus aureus ( S. aureus ) based on luminescence energy transfer (LET) using double-wavelength emission (550 nm and 812 nm) upconversion nanoparticles (UCNPs) as donor, gold nanoparticles (AuNPs) as acceptor and the aptamer for S. aureus as the specific recognition and link unit. The LET process could cause luminescence quenching because of the spectral overlap between the acceptor and the donor at 550 nm. In the presence of S. aureus , S. aureus selectively combined with the aptamer, and the AuNPs left the surface of UCNPs, which weakened the quenching effect and restored the luminescence of UCNPs. Based on this, the ratio detection was realized by monitoring the change of the luminescence signal of the probe at 550 nm and taking the luminescence signal at 812 nm as the reference signal. Crucially, the probe has a fast reaction speed, with a reaction time of 25 min, and the detection of S. aureus is realized in the concentration range of 5.0 × 10 3 –3.0 × 10 5 CFU/ml, with the detection limit of 106 CFU/ml. Therefore, the ratio probe has great potential for detecting of S. aureus in food because of its high sensitivity, fast speed and good selectivity.
研究领域:
分析化学
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）