ACS Applied Optical Materials
·
2023
·
IF 0
Xiaoya Bu,Yan-gai Liu,Ci’an Xie,Baochen Wang
The long-afterglow luminescent material Sr2MgSi2O7:(Eu, Dy) was combined with the photocatalytic material g-C3N4 to construct a type of Sr2MgSi2O7:(Eu, Dy)/g-C3N4 self-luminous photocatalytic composite. This overcomes the limitation that photocatalytic experiments can only be carried out under an external light source, and it provides a more flexible way to use photocatalytic technology in environmental purification. The morphology, structure, luminescence, and photocatalytic properties of the samples were investigated using a variety of advanced characterization techniques. The results show that the significant improvement in the photocatalytic performance is attributed to the formation of a Z-scheme heterojunction between the luminescent and photocatalytic materials and the promotion of the photocatalytic reaction by the properties of the long-afterglow luminescent material itself. A possible mechanism for the photocatalytic process of the composite is proposed, and it is speculated that the reason for the increased photocatalytic activity is internal electron transfer and electron–hole pair separation based on tests such as X-ray photoelectron spectroscopy and density functional theory calculations. This study provides a strategy for enhancing the photocatalytic activity of photocatalysts and achieving round-the-clock degradation of pollutants.
研究领域:
材料科学
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环境净化
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光催化
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纳米技术
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DOI
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xiang Xu,Junjie He,Yanning Zeng,Caili Yu,Faai Zhang
The surface-initiated metal-free atom transfer radical polymerization (ATRP) solution polymerization of methyl methacrylate was carried out for the first time on the basis of the reductive quenching mechanism. In this study, the 2-bromoisobutyryl bromide (BiBB) was anchored on the surface of self-synthesized rod-like mesoporous material SBA-15 as the initiator, with the commercially available organic dye fluorescein (FL) as photocatalyst and triethylamine (TEA) as electron donor under the irradiation of blue lamp. The obtained composites and polymers were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, N 2 adsorption/desorption measurements, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and gel permeation chromatography. The results demonstrated that the ordered mesoporous structure of SBA-15 was not disrupted after the polymerization. With an increase in illumination time, the grafting amount and the number average molecular weight of poly(methyl methacrylate) (PMMA) on the surface of SBA-15 linearly increased, and the molecular weight distribution ( Đ ) widened. PMMA with a relatively narrow Đ value was obtained after polymerization for 10 h (1.47). The increase in the grafting amount and molecular weight after chain extension confirmed the chain end functionality of PMMA grafted on SBA-15.
研究领域:
高分子化学
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材料科学
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纳米技术
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表面工程
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光化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2013
·Vol. 48
·期 24
·8386-8392
·
IF 2.163
Du Pingfan,Song Lixin,Xiong Jie,Cao Houbao
TiO 2 and ZnO nanofibers were fabricated through a facile electrospinning method. The obtained nanofibers were characterized by a variety of analytical means including FESEM, TEM, SAED, XRD, UV–Vis, and PL. Compared with nanoparticles, nanofibers can be recycled more easily when they are used as photocatalysts. The photocatalytic activities of these two nanofibers were investigated and compared by evaluating the photodegradation of hazardous dye Rhodamine B. Although, ZnO nanofibrous photocatalyst exhibits better initial activity than TiO 2 nanofibrous counterpart, its photocatalytic performance is inferior to that of the latter on the whole. The photo-instability arising from photocorrosion may be responsible for its rapid deterioration in activity. The difference in the photocatalytic properties between TiO 2 and ZnO nanofibers was discussed, and a possible photodegradation mechanism of organic dyes in the presence of the nanofibrous photocatalyst was proposed. This work offers a direct insight into the comparison of photocatalysis of electrospun TiO 2 and ZnO nanofibers.
研究领域:
材料科学
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环境化学
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纳米技术
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光催化
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功能材料
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Fenmin Cheng,Xiangsi Wu,Mali Liu,Yunfei Lon,Guanfan Chen,Rongjin Zeng
Sulfide anion (S 2− ) has been known as toxic species for many years. Notably, hydrogen sulfide (H 2 S), as its protonated product, is recently recognized as the third endogenous gaseous transmitter and is related to many diseases. Thus, it is of vital importance to achieve rapid, sensitive and selective detection of S 2− in various conditions. Herein, we firstly report a novel porphyrin-based NIR turn-on fluorescent sensor for S 2− detection. The pristine sensor displays weak fluorescence due to the photo-induced electron transfer (PET) process which occurs from porphyrin fluorophore to the electron-withdrawing 2,4-dinitrobenzenesulfonyl group. Upon being with S 2− , the 2,4-dinitrobenzenesulfonyl group of the sensor is efficiently removed and the significant NIR fluorescence enhancement can be observed. Exhibiting a large NIR fluorescence turn-on signal, the sensor shows high sensitivity, high selectivity as well as quick response (∼60 s) when detecting S 2− . Moreover, it displays very low cytotoxicity and can be employed to monitor S 2− levels in tap water and living cells. Overall, this simple strategy may be used for development of NIR fluorescent sensors towards a wide variety of analytes.
研究领域:
分析化学
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生物医学工程
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分子影像学
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化学生物学
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环境监测
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细胞生物学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Ting Liu,Wenqi Wang,Dan Jian,Jiahao Li,He Ding,Dingrong Yi,Fei Liu,Shouyu Wang
In order to detect Hg 2+ in remote and on-site mode, we design a smartphone based optical fiber fluorescence sensor (SOFFS), which is composed of a semiconductor laser for fluorescence signal excitation, a quantum dot modified fiber probe for Hg 2+ sensing, a smartphone with a filter for fluorescence signal collection, and a fiber coupler for connecting fiber probe, laser and smartphone. With the evanescent wave on the optimized combination tapered fiber probe surface, SOFFS has an ultra-low detection limit of 1 nM and a wide detection range between 1 nM to 1000 nM. Besides, it is handheld with a small size of 79×57×154 mm 3 and inner power supply, and the combination tapered fiber probe can be easily replaced, supporting the remote and on-site applications. Additionally, a smartphone application is designed for automatically quantifying the fluorescence signals for accurate and rapid Hg 2+ detection. Since SOFFS is compact and cost-effective, moreover, it can measure Hg 2+ in fast speed, excellent selectivity, high accuracy and sensitivity, it is a potential tool for remote and on-site applications.
研究领域:
分析化学
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环境监测
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生物传感
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光学传感器
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微量金属检测
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Chengrui Xie,Fan Wang,Yueying Zheng,Zeyu Guo,Mengxia Xu,Tao Wu
This work provided a green, one-pot route to synthesize mesoporous g-C3N4. A series of characterizations revealed that the mesoporous sample maintained the typical structure of g-C3N4. The findings displayed that this mesoporous material had enlarged porosity and optical properties. The largest SBET of the mesoporous sample (32.65 m2/g) was 4.36 times larger than that of the bulk sample (7.48 m2/g). The photoactivity of the prepared photocatalysts was measured by the photocatalytic removal of rhodamine B (RhB). In agreement with the characterization analysis, the mesoporous g-C3N4 (99.60%) exhibited a 3.88 times better photocatalytic efficiency than that of bulk g-C3N4 (25.63%) and an 11.19 times faster reaction rate in the same period. In addition, the possible mechanism of this photodecomposition reaction was identified by the electron spin resonance (ESR) and trapping tests. The results demonstrated that •O2– and •OH made contributions, and •O2– played a dominant role in this process. This research offers a promising method for the synthesis of mesoporous g-C3N4 in an environmentally friendly and cost-effective route with remarkably high photoactivity.
研究领域:
环境化学
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材料科学
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光催化
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纳米材料
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环境功能材料
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绿色合成
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DOI
高影响因子
GIANT
·
2024
·
IF 5.4
Xiaohui Sun,Jiuyue Zhang,Xu Li,Xuelei Gong,Debin Kong,Linjie Zhi
Alternating current electroluminescent (ACEL) devices have attracted tremendous attention due to their significant applications in bioinspired electronics, smart wearables, and human-machine interfaces. However, it still faces limitations in real-time visual temperature sensing. Herein, a universal strategy is established to achieve real-time temperature dynamic visualization by integrating a thermochromic layer through a simple spin coating procedure. Such elaborate integration permits the device to display a wide array of luminous colors and achieve high-contrast color transitions in response to ambient temperature variations. More importantly, a quantitative relationship can be established between the temperatures and the luminous color changes. This advancement not only enhances multi-color emission capabilities but also enables the display of diverse information, marking a significant stride in the development of dynamic temperature sensing in ACEL devices.
研究领域:
材料科学
·
生物医学工程
·
柔性电子学
·
智能传感
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人机交互
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Wenjia Li,Chang Liu,Dong Liu,Shuda Liu,Tianyan You
The demand for efficient methods to determine mercury ion (Hg 2+ ) is increasing. Herein, we developed a ratiometric fluorescence assay by the coupling of nanozyme and fluorescence resonance energy transfer (FRET) to determine Hg 2+ . Platinum nanoparticles (PtNPs) was synthesized as effective nanozyme to catalyze the oxidation of o-phenylenediamine (OPD) at the presence of hydrogen peroxide (H 2 O 2 ) to produce 2,3-diaminophenazine (DAP). The fluorescence emission of Si quantum dots (QDs) at 414 nm (I 414 ) was observed to be quenched by DAP (emission at 576 nm (I 576 )) via FRET mechanism, whereas Hg 2+ can depress the catalytic activity of PtNPs to generate DAP. Based on this principle, SiQDs/PtNPs/OPD/H 2 O 2 -based ratiometric fluorescence assay was developed that the emission ratio of DAP and SiQDs (I 576 /I 414 ) decreased with a higher concentration of Hg 2+ . Noteworthy, the sensitivity of such system was found to be related with the value of I 576 /I 414 . The developed assay offered a detection range of 20–3000 nM and a detection limit of 10.5 nM. This assay was applied to analyze Yangtze river water, and its reliability has been validated by the standard ICP-MS method. Our work provided an effective and convenient method for Hg 2+ detection.
研究领域:
分析化学
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环境监测
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纳米生物技术
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分子探针
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重金属检测
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DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 11
·5202-5211
·
IF 3.5
Die Hu,Ran Xiao,Xiang Lv,Chunwei Yang,Jianxia Liu,Yuefeng Zhao,Ning Guo
The realization of thermally stable Tb3+-doped green emission at high temperatures in solid-state lighting is still a crucial challenge. Nevertheless, the study on modulating the thermally stable luminescence at high temperatures is seldom reported. The position of the intervalence charge transfer (IVCT) energy level is used to systematically investigate the thermal quenching performance of Tb3+-activated green-emitting phosphors with varying concentration gradients of Gd1−xTaO4:xTb3+ (x = 0.1%, 0.5%, and 2%) in this study. The IVCT energy levels were determined according to the empirical formula to show a decreasing trend, consistent with the position of the IVCT energy levels measured in the excitation and diffuse reflectance spectra. Moreover, the thermal quenching performance of different wavelength excitation positions (host absorption, 4f–5d of Tb3+, and Tb3+–Ta5+ IVCT band) is quite different. The modulation of thermal quenching performance among distinct phosphors when subjected to host excitation or IVCT excitation can be elucidated through optimal positions within the energy levels associated with IVCT. The diverse concentration gradient samples exhibit varying degrees of thermal quenching performance in the variable-temperature spectra. The fluorescence lifetimes of the samples are generally comparable but slightly lower. The quantum efficiency rapidly improves as the Tb concentration increases. The underlying mechanism governing this phenomenon is elucidated by constructing a model that encapsulates the interplay between the compensating and quenching channels, in addition to the energy conversion of Tb3+ into Gd3+. The abovementioned results indicate that the dual driving scheme of the doping concentration and excitation wavelength is an effective means to regulate the thermal quenching performance of Tb-activated green-emitting tantalate phosphors.
研究领域:
材料科学
·
发光材料
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固体化学
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光电子学
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无机功能材料
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DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 43
·16757-16763
·
IF 4.569
Chaojie Li,Jiyou Zhong,Huan Jiang,Peng Shi
Compact broadband near-infrared (NIR) light sources generated by phosphor-converted light-emitting diodes (pc-LEDs) have attracted considerable interest in emerging smart NIR spectroscopy applications. However, discovering a highly efficient and thermally stable broadband NIR phosphor still remains a significant challenge. Here, we report a new efficient garnet phosphor, Gd3In2Ga3O12:Cr3+, which has a broadband emission peaking at 780 nm with a full-width at half maximum (FWHM) of 124 nm. The optimized Cr3+-doping concentration of this material is particularly high (9 mol%), resulting in a high quantum yield and absorption efficiency of 85.3% and 49.1%, respectively. Moreover, 87.7% of the initial emission intensity can be retained when heating up to 150 °C, demonstrating the excellent thermal stability of this material. Fabricating a prototype NIR device by using the as-prepared material in combination with a blue LED chip, an excellent NIR output power (33.7 mW) with a NIR photoelectronic conversion efficiency of 12.0% can be achieved under a 100 mA driving current. These results indicate that the Gd3In2Ga3O12:Cr3+ phosphor may have great potential for broadband NIR pc-LED applications.
研究领域:
光学材料
·
生物医学光子学
·
分子成像
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转化医学
·
半导体器件
·
光电子学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kai Wang,Nini Zhao,Haiyan Xie,Jingzhi Wang,Wenli Xu,Zhiliang Jin
Improving the separation efficiency of semiconductor photogenerated carriers is an important way to enhance the photocatalytic activity of water splitting. To establish an efficient photocatalytic hydrogen production system, a practical method combining metal-like cocatalysts with semiconductors was designed. This article prepared Ni-CdS by modifying Prussian blue analogues and synthesized Ni-CdS/1T-WS 2 composite materials by low-temperature mixing with metal-like catalyst 1T-WS 2 . At the optimal load concentration, it can reach 62.65 mmol g -1 . Firstly, the close contact interface formed between the two enables rapid transfer of photo generated electrons . Secondly, metal-like cocatalysts have a strong attraction to the charges generated by light, forcing electron hole separation and exacerbating this effect under illumination. This has been strongly demonstrated through a series of characterizations and in-situ radiation X-ray photoelectron spectroscopy. In summary, this study provides a reliable and clear understanding for the modification of Prussian blue analogues and the regulation of photo induced charge transfer by metal-like cocatalysts.
研究领域:
材料科学
·
物理化学
·
能源催化
·
半导体光催化
·
纳米材料
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Junlong Zhang,Yan Lu,Lei Ge,Changcun Han,Yujing Li,Yangqin Gao,Songsong Li,Hao Xu
Novel AuPd bimetallic alloy nanoparticles (NPs) decorated two-dimensional (2D) BiVO 4 nanosheet photocatalysts were successfully synthesized via mild wet-chemical process and facile deposition procedure. The composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electronic microscope (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflection spectroscopy (DRS), electron spin resonance (ESR) and surface photovoltage spectroscopy (SPV). The 1.0 wt% AuPd/BiVO 4 nanosheets showed highest photocatalytic activity for the degradation of Rhodamine B (RhB) under visible light (300 W Xe lamp coupled with a UV-cutoff filter (λ ≥ 400 nm)), and the photocatalytic efficiency was improved for about 21.9 and 6.1 times as compared to that of pure BiVO 4 and 1.0 wt% Au/BiVO 4 , respectively. The novel AuPd/BiVO 4 composites may make a way to synthesize 2D semiconductor composites with potential applications for solar energy conversion and environmental purifications.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境净化
·
能源化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）