Chinese Physics B
·
2022
·Vol. 31
·期 7
·078102
·
IF 1.652
Zhangyu Gu,Yisong Fan,Yixing Ye,Yunyu Cai,Jun Liu,Shouliang Wu,Pengfei Li,Junhua Hu,Changhao Liang,Yao Ma
Non-stoichiometric copper selenide (Cu2 – xSe, x = 0.18 ∼ 0.25) nanomaterials have attracted extensive attentions due to their excellent thermoelectric, optoelectronic and photocatalytic performances. However, efficient production of Cu2 – xSe nanoparticles (NPs) through a green and convenient way is still hindered by the inevitable non-environmentally friendly operations in common chemical synthesis. Herein, we initially reveal the coexistence of seleninic acid content and elemental selenium (Se) NPs in pulsed laser-generated Se colloidal solution. Consequently, we put forward firstly a closed-cycle reaction mode for totally green production of Cu1.8Se NPs to exclude traditional requirements of high temperature and toxic precursors by using Se colloidal solution. In such closed-cycle reaction, seleninic acid works as the initiator to oxidize copper sheet to release cuprous ions which can catalyze the disproportion of Se NPs to form {{\rm{SeO}}}_{3}^{2-} and Se2– ions and further produce Cu2 – xSe NPs, and the by-product {{\rm{SeO}}}_{3}^{2-} ions promote subsequent formation of cuprous from the excessive Cu sheet. In experiments, the adequate copper (Cu) sheet was simply dipped into such Se colloidal solution at 70 °C, and then the stream of Cu1.8Se NPs could be produced until the exhaustion of selenium source. The conversion rate of Se element reaches to more than 75% when the size of Se NPs in weakly acidic colloidal solution is limited between 1 nm and 50 nm. The laser irradiation duration shows negative correlation with the size of Se NPs and unobvious impact to the pH of the solution which both are essential to the high yield of Cu1.8Se NPs. Before Cu sheet is exhausted, Se colloidal solution can be successively added without influences to the product quality and the Se conversion rate. Such green methodology positively showcases a brand-new and potential strategy for mass production of Cu2 – xSe nanomaterials.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 9
·2203028
·
IF 9
Guozhen Li,Qiwen Pan,Zhihao Zhou,Ranran Gu,Hao Zhang,Xiongjian Huang,Guoping Dong,Xiudi Xiao
Perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals with advantages of high quantum yield, narrow emission peaks, and tunable fluorescence are considered as the next generation of light-emitting sources. However, fluorescence degradation due to the poor stability of perovskite nanocrystals in moisture, high temperature, and illumination remains one of the greatest challenges in their further development. In this work, a fully dense coating strategy is proposed to improve the overall stability of perovskite nanocrystals, especially under high-density laser irradiation. A mesoporous silica SiO 2 layer is introduced to construct a stable coating for isolating the perovskite from external environment. To eliminate the pores of the CsPbX 3 @SiO 2 , an inorganic glass is also employed via solution-combustion technique to generate a fully compact encapsulation for further stability promotion. The as-prepared nanocrystal-in-glass composite exhibits efficient and stable fluorescence performance in luminous efficiency, chromaticity, and long-term reliability in the conditions of thermal shock, humidity, and blue laser irradiation. With the integration of red/green/blue emitting nanocrystals, the color gamut of the white laser lighting source covers 134% of the National Television Standards Committee standard, providing exciting opportunity for high performance laser-driven white light generation.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 36
·28633-28642
·
IF 3.84
Huaizhong Shen,Yuxin Wu,Liping Fang,Shunsheng Ye,Zhaoyi Wang,Wendong Liu,Zhongkai Cheng,Junhu Zhang,Zhanhua Wang,Bai Yang
A rapid and cost effective method has been developed to fabricate 3 dimensional (3D) ordered structures by photo-generating silver networks inside a 1D layered heterogeneous laminate composed of poly(vinyl alcohol) (PVA) and poly(methyl methacrylate) (PMMA). By designing the photo-mask meticulously, the silver nanoparticles (NPs) produced by UV light aggregate to form frameworks in different forms, which perform as the anisotropic component, i.e. the building blocks, thus converting the 1D structure into 3D. Formation of silver NPs increases the refractive index (RI) of the PVA layers, thus bringing optical change to the 1D laminar structure, which allows us to trace the silver formation process by measuring the change of RI value and reflectance spectra. The 1D layered structure is a good building matrix for 3D construction because the total number of layers and the layer thickness can be finely tuned flexibly which allow us to further study the various properties caused by the structural modulation. By utilizing photo-reactive silver ions, an innovative strategy of fabricating 3D structures through in situ photo-generating silver building blocks inside the laminar matrix is established, which makes it possible to fabricate 3D micro/nano composite materials with potential applications in fields such as sensors and photonic meta-materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Jie Yin,Sizhe Li,Hao Zhang,Yao Lu,Yan Zhao,Kai A. I. Zhang
Conjugated polymers (CPs) have garnered attention for their tailorable structure properties, particularly in the context of efficient photosynthetic hydrogen peroxide (H2O2) production. However, the challenge lies in the precise molecular engineering of CPs to facilitate differing reaction pathways, thereby enhancing H2O2 photogeneration efficiency. In this study, we developed dual-chain CPs (DC-CPs) with a distinctive architecture, employing the supramolecular host cucurbit[8]uril as a "molecular lock" to conjoin two polymer chains. The dual-chain configuration is designed to harbour a central reaction centre conducive to oxygen reduction, providing dual conduction pathways for reactant molecules. The existence of this central reaction center was confirmed through the in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy measurements and density functional theory (DFT) calculations. In addition, femtosecond transient absorption (fs-TAS), variable temperature fluorescence spectroscopy and time-resolved photoluminescence (TRPL) measurements reveal double-stranded structures favourable for carrier transport and reactive site activation between dual polymer chains. Ultimately, DC-CPs demonstrate up to a threefold increase in H₂O₂ production compared to their respective single-chain CPs (SC-CPs). This work adds significantly to the application of CPs for efficient H2O2 photogeneration through molecular engineering strategy.
研究领域:
材料科学
·
光催化
·
超分子化学
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产品关联
DOI
高影响因子
Environmental Science-Processes & Impacts
·
2020
·Vol. 22
·期 9
·1842-1851
·
IF 3.238
Xintong Li,Chen Shen,Hongxia Zhao,Jingqiu Jiang,Zixin Ban,Zhenyu Chen,Baocheng Qu
This study investigates the formation of persistent free radicals (PFRs) on particulate organic matter (POM) under irradiation in water. A montmorillonite–humic acid complex (Mnt–HA complex) was prepared to simulate POM, and the generated PFRs were detected by the electron paramagnetic resonance (EPR) technique. EPR signals with the trend of an initial increase and then a decrease were observed under irradiation for 8 days, and the g factors were in the range of 2.0034–2.0039, which indicated the generation of carbon-centered radicals with electrophilic moieties. Different concentrations and types of halophenols and transition-metal ions were respectively adsorbed on the Mnt–HA complex to probe their influence on the formation of PFRs. The amount of PFRs generated in the Mnt–HA complexes was in the order: 2-bromophenol (2-BP) > 2,4-dibromophenol (2,4-DBP) > 2,4-dichlorophenol (2,4-DCP), which implied that halogen substitution and the number of substituents in the halophenols could affect the generation of PFRs. The effects of transition-metal ions that resulted in the reduction of PFRs when adsorbed on the Mnt–HA complex were as follows: Fe3+ > Zn2+ > Cu2+ > Mn2+, and this is in agreement with their redox capacity. Analyzing the induced generation of reactive oxygen species (ROS) and electrons on POM, it is found that halophenols and transition metal ions also affected this process under irradiation. These findings indicate that the photoformation of PFRs on POM could be a source of PFRs in aqueous environments and requires further attention.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Zhang Hongding,Ke Changlu,Xing Zhenhua,Zhao Mengqi,Xiang Xin,Wang Hai-Bo
Although fluorescent probes have been used extensively for alkaline phosphatase (ALP) sensing, most involve a tedious, prolonged, or high-cost synthesis procedure. Thus, it is still necessary to develop convenient and economical fluorescent probes for sensitive determination of ALP. Herein, a facile fluorescent strategy was designed for ALP detection utilizing the fluorogenic response of thiamine (TH) triggered by Cu 2+ (Cu 2+ -TH system). It was found that Cu 2+ facilitated the oxidation of non-fluorescent TH to fluorescent thiochrome (TC) in an alkaline environment, while pyrophosphoric acid (PPi) interacted with Cu 2+ to form PPi-Cu 2+ chelates, preventing the oxidation of TH to fluorescent TC. Consequently, a faint fluorescence output was detected in the system. After adding ALP into this system, PPi was catalyzed to phosphate (Pi), which combined weakly with Cu 2+ . A large amount of TH was oxidized into fluorescent TC by free Cu 2+ , leading to high fluorescence. Therefore, an ALP sensing platform was constructed by utilizing the fluorogenic reaction of the Cu 2+ -TH system as the signal reporter. The assay exhibited favorable analytical performance for ALP measurement. A linear correlation was obtained between the ALP concentration (0.01–1 mU/mL) and the fluorescence intensity of the Cu 2+ -TH system, with a limit of detection as low as 0.0038 mU/mL. Additionally, the assay was further employed for analyzing ALP content in complex biological samples. This work thus advances the science of in situ fluorogenic reaction in the field of biosensing. Graphical
研究领域:
分析化学
·
生物化学
·
生物传感
·
无机化学
·
荧光光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 37
·9897-9902
·
IF 5.976
Hong Wang,Peisheng Zhang,Baiju P. Krishnan,Maolin Yu,Jie Liu,Mingju Xue,Shu Chen,Rongjin Zeng,Jiaxi Cui,Jian Chen
The development of switchable white-light emitters is extremely challenging but urgently needed for various applications. We describe a class of switchable fluorescent polymeric nanoparticles (SFPNs) that can alternate their emission color among stable white, cyan, or pink. These SFPNs consist of a dye with cyan-light emission and a spiropyran (SP) derivative with photochromism. When the SP derivative is transferred to its merocyanine state, fluorescence resonance energy transfer (FRET) occurs from the cyan dye to the merocyanine one. In a rational design of transfer efficiency, a stable white-light emission is achieved. This white-light emission can be switched to the cyan-light one upon photoirradiation or pink-light one by solvent-induced swelling. Such multi-color fluorescent alternation is reversible and therefore allows for data encryption. Because of the facile synthesis, excellent long-term stability, fast photo-responsibility, high-contrast fluorescence, and outstanding switchability of these nanoparticles, we envision that they should have great potential in various applications such as high-resolution imaging, white luminescence, and data encryption.
研究领域:
材料科学
·
光学
·
纳米技术
·
光化学
·
数据安全
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Qiwen Du,Weichen Jia,Jingyu Dai,Chao Du,Aiyun Shao,Rongmin Zhang,Yuefei Ji
Natural organic matter (NOM) contains a large number of aromatic ketones and quinones, which can produce reactive oxygen species (ROS), such as 1 O 2 and HO·, through photosensitization. These ROS play important roles in the attenuation of organic pollutants in sunlit surface water. The NOM components fractionated with XAD-8 resin at different pH influence the photo-generation of ROS, which may be related to the degree of dissociation of functional groups. In this study, probe chemicals were used to investigate the effect of dissociation degree (p K a ) of NOM model compounds on ROS production under 254 nm UV irradiation. Experimental results showed that six model compounds with similar molecular weights and structures but different p K a values have different ROS production abilities in a pH 7.0 reaction system. The ability for DHB 2,5 (2.97), DHB 3,4 (4.48), and GUA (9.99) to photo-generate 1 O 2 increased with increasing dissociation. The ability for DHB 3,4 and GUA to photo-generate HO· followed the same trend. The correlation between NOM dissociation constant and ROS generation is preliminary established, which explains the influence of functional groups. Our results may provide some basic information for understanding the correlation between NOM structural features and ROS generation.
研究领域:
环境化学
·
光化学
·
水处理
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
Hongbo Lu,Shunpin Mo,Lei Chen,Xiaoyu Chang,Fang Yong,Miao Xu
Polymer-dispersed liquid crystals (PDLCs) with low volume shrinkage and high peel strength were prepared through an epoxy-thiol click reaction catalyzed by the photogenerated base catalyst. The epoxy-thiol reaction was initiated by UV light irradiation, effectively circumventing the environmental sensitivities typically associated with conventional thermally-catalyzed polymerization processes. A systematic study was conducted to examine the impact of polymer concentration, curing temperature, polymerization light intensity and the structure of epoxy on PDLC performance. The results showed that adding a rigid epoxy structure can significantly improve the peel strength, broaden the viewing angle, and smaller the volume shrinkage. Moreover, the incorporation of 25 wt% 2,2-Bis(4-glycidyloxy-phenyl)propane into the PDLC formulation yielded PDLC with an exceptional peel strength of 50.60 N/m, volume shrinkage of 5.06%, and an expansive viewing angle having transmittance above 80% from 0° to 60°, making them highly suitable for flexible PDLC applications.
研究领域:
材料科学
·
高分子化学
·
液晶
·
光学材料
·
粘附技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Guoyang Zhang,Shijie Wei,Bingdang Wu,Zhihao Chen,Shujuan Zhang
Nitrous oxide (N2O) is widely used in radiation-chemistry and photochemistry as a scavenger to convert a hydrated electron (eaq–) into a hydroxyl radical (·OH). However, few investigations pay attention to the photochemistry of dissolved N2O itself. The effects of purged N2O on photochemical processes are unclear and neglected. In the present work, the effects of N2O on the hydroxylation of terephthalic acid (TPA) were investigated with both medium-pressure and low-pressure mercury lamps as the light sources. Under short-wavelength UV (200–300 nm) irradiation, N2O accelerated the decay of TPA and the formation of 2-hydroxylterephthalic acid (hTPA). The effective quantum yield of ·OH from the photolysis of dissolved N2O at 254 nm was determined as 1.15–1.63, which was far larger than those of NO3– (0.09) and NO2– (0.046). On the basis of the kinetic analysis in N2 and N2O purged solutions, isotope fractionation with heavy oxygen water, and ·OH scavenging experiments with tert-butyl alcohol, the contribution of the ·OH radicals generated from the photolysis of N2O to the formation of hTPA (61.7%) was determined to be 1 order of magnitude higher than that from the converted eaq– (6.5%). These results demonstrate that using N2O and ·OH probes to quantify photogenerated eaq– in UVC irradiation might lead to false results. The work here is helpful for the proper design of scavenging and probing experiments by the combination of N2O and ·OH probes.
研究领域:
光化学
·
辐射化学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2020
·Vol. 63
·期 4
·554-560
·
IF 6.356
Liu Guoyong,Zhao Jiahui,Yan Mengxia,Zhu Shuyun,Dou Wenchao,Sun Jian,Yang Xiurong
The discovery and application of analyte-triggered fluorophore generation or fluorogenic reaction are significant and beneficial to the development of novel fluorescence (FL) analysis method. In this study, for the first time, we have reported a fluorogenic reaction to prepare fluorescent silicon-containing polymer dots (Si-PDs) by simply mixing N -[3-(trimethoxysilyl)propyl]ethylenediamine (DAMO) and hydroquinone (HQ) in aqueous solution at ambient temperature. Inspired by the alkaline phosphatase (ALP)-catalyzed hydrolysis of the substrate sodium 4-hydroxyphenyl phosphate (4-HPP) into HQ and the resultant HQ-controlled intense green Si-PDs generation, we have established a straightforward ALP activity assay by innovatively employing commercially available 4-HPP as the substrate. More significantly, the specific preparation method, clear formation mechanism and excellent performance enable the Si-PDs as well as its generation process to develop facile and attractive FL immunoassay. With the help of the universal ALP-based enzyme-linked immunosorbent assay (ELISA) platform and corresponding antibody, a convenient and conceptual ALP-based fluorescent ELISA has been constructed and applied in sensing cardiac troponin I (cTnI), a well-known biomarker of acute myocardial infarction. Our research via in situ formation of fluorescent nanomaterials has great potential application in ALP activity assay, inhibitor screening, and disease diagnosis.
研究领域:
分析化学
·
生物化学
·
纳米材料
·
诊断学
·
免疫分析
✓ 已验证
产品关联
DOI
高影响因子
Nature Photonics
·
2023
·Vol. 17
·期 8
·694-701
·
IF 35
Mutailipu Miriding,Han Jian,Li Zhi,Li Fuming,Li Junjie,Zhang Fangfang,Long Xifa,Yang Zhihua,Pan Shilie
Phase-matching of light waves is a critical condition for maximizing the efficiency of nonlinear frequency conversion processes in nonlinear optical crystals; however, phase-matching, commonly achieved by tuning birefringence, is often difficult to achieve over a wide wavelength range. Here, full-wavelength phase-matching crystals that can avoid phase-mismatching across the entire optical transparency range are proposed. The anisotropic strength of bonding in the dimension of energy is confirmed theoretically to be the key to the full-wavelength phase-matching ability. We demonstrate that a crystal of guanidinium tetrafluoroborate (C(NH 2 ) 3 BF 4 ) can be phase-matched throughout its entire optical transparency range and is able to generate harmonic light as short as ~193.2 nm, which is close to its deep-ultraviolet cut-off edge. Importantly, this crystal is stable, cheap and efficient compared with commercially available nonlinear optical crystals for generation of 266 nm light. This work lays the foundation for finding a new class of crystals in which the phase-matching wavelength fully covers its optical transparency range, and also provides a high-performance crystal for generating light at 266 nm—the fourth-harmonic of a commercial 1,064 nm laser.
研究领域:
光学
·
材料科学
·
非线性光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）