JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 19
·13924-13935
·
IF 2.993
Liu Huihui,Xiang Miaomiao,Shao Xiang
The interface of graphene (G) and oxide can significantly influence the properties and/or applications of the binary system. However, it is usually beyond controllability during the conventional physical intermixing and/or solvothermal preparations. In this article, by directly growing nanocrystalline graphene films on the ZnO nanocrystals through a medium-temperature chemical vapor deposition method utilizing C 2 H 2 as the carbon source, we successfully achieved a G/ZnO binary structure with a uniform and contamination-free G/oxide interface. The fabricated G/ZnO powders not only demonstrated a clear charge transfer between graphene and ZnO that leads to photoluminescence quenching, but also manifested an enhanced activity in the photocatalytic degradation of methylene blue when the graphene thickness is optimized. This work has demonstrated the essential significance of the interface control for the functionality of the graphene/semiconductor binary systems.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 10
·3746-3755
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IF 8.067
Dong-Yang Li,Yu Cheng,Yu-Han Hou,Jun-Hua Song,Chuan-Ju Sun,Cheng-Yang Yue,Zhi-Hong Jing,Xiao-Wu Lei
The concentration-caused quenching (CCQ) effect seriously deteriorates the photoluminescence (PL) efficiency of 0D organic–inorganic hybrid halide perovskites but reasonable management of CCQ via accurate structural design strategies remains a formidable challenge for PL property optimization. Herein, by fine-tuning the geometric configurations of organic cations, a controllable PL quenching-activation switch is realized by accurately modulating the CCQ effect. Specifically, we rationally designed a couple of 0D antimony halides, namely [BPP]SbCl5 (BPP = 1,3-bis(4-pyridyl)-propane) and [BPPP]SbCl5 (BPPP = 1,3-bis(4-piperidyl)-propane), based on the same [SbCl5]2− units. Through purposive structural regulation from the closely confined [BPP]2+ to the incompact [BPPP]2+ matrix, the concentration of the fluorescent [SbCl5]2− species and the CCQ effect were notably diminished, which significantly promoted the localization degree of the photoelectrons. Hence, [BPPP]SbCl5 displays enhanced broadband yellow light emission with a high photoluminescence quantum yield of 79.57%, while [BPP]SbCl5 is completely non-luminescent. In addition, by virtue of the PL inactivation–activation conversion in the superfast assembly process from SbCl3 to [BPPP]SbCl5, secret information encrypted by an invisible printed SbCl3 pattern can be rapidly decrypted by the light-emissive [BPPP]SbCl5 under the trigger of an organic precursor, which showcases the potential in confidential information encryption–decryption technology.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 5
·1081
·
IF 3.2
Xuezhuan Yi,Qinglin Sai,Yanna Tian,Renjie Jiang,Mingqin Li
This paper demonstrates the application of eutectic welding to Ce3+:YAG transparent ceramics for reliable detection and imaging of UV emission, particularly focusing on demanding conditions, such as high repetition rate, high energy, and high vacuum. A series of Ce3+:YAG transparent ceramics with different Ce3+doping concentrations (0.1 at%, 0.3 at%, 0.5 at%, and 1.0 at%) were prepared via vacuum sintering. Their crystal microstructure, luminescence properties, transmittance, and fluorescence lifetime were studied. It was found that the optimal Ce3+doping concentration is 0.3 at%. The measured ultraviolet-to-visible energy conversion efficiency of the 0.3 at% Ce3+:YAG transparent ceramics with a thickness of 1.0 mm is 3.9%. Compared with silicone encapsulated Ce3+:YAG transparent ceramic samples, the eutectic-soldered samples exhibited excellent resistance to temperature quenching of the luminescence, which indicates that eutectic welding can effectively improve the fluorescence performance of Ce3+:YAG transparent ceramics for the application of deep ultraviolet light detection.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9666-9672
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IF 5.256
Xia Xu,Yan Long,Pengpeng Lei,Lile Dong,Kaimin Du,Jing Feng,Hongjie Zhang
We report a hybrid assembly based on NaYF4:Yb3+,Er3+/Tm3+@NaYF4 (core@shell) upconversion nanocrystals and ultrasmall Ni nanoparticles (abbreviated as core@shell@Ni) for rapid response towards pH in different PBS solutions. In this approach, Ni nanoparticles located on the surface of the core@shell upconversion nanocrystal serve as an efficient quencher for upconversion luminescence (UCL). A series of dynamic processes of the 4S3/2 → 4I15/2 transition of Er3+ in Er3+-doped core@shell@Ni have been presented in order to discuss the energy transfer mechanisms between UCNPs and Ni nanoparticles. The upconversion luminescence can be recovered by incubating the core@shell@Ni assembly with pH 5.0 PBS that oxidizes Ni to Ni2+, while the UCL could be still quenched when the hybrid assembly was incubated with pH 7.4 PBS. However, the core@shell@Co assembly's response toward pH is not distinguished due to the rapid recovery of emission intensity both in pH 5.0 and 7.4 PBS. The ability of the core@shell@Ni assembly to distinguish different pH values may be a fine platform for the real-time optical monitoring of chemical reactions and many important physiological processes associated with pH.
研究领域:
生物医学工程
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纳米材料科学
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光学成像
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DOI
高影响因子
Materials Today Chemistry
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2019
·
IF 0
Q.-B. Hoang,V.-T. Mai,D.-K. Nguyen,D.Q. Truong,X.-D. Mai
Highly luminescent and water-soluble carbon quantum dots (CQDs) have been integrated into polyvinyl alcohol (PVA) recently to realize composites with synergistic functionalities. The effects of chemical interactions between CQDs and PVA matrix on the changes in optical properties of CQDs or physicochemical properties of PVA are yet to be investigated fully. Herein, we first synthesized CQDs with different surface chemistry via varying the molar ratio between citric acid (CA) and ethylenediamine and then embedded the CQDs into PVA with or without additional CA crosslinking. Infrared and UV–vis studies on CQDs and composites showed that condensation between CQDs and PVA induced a redshift in the absorption peak originating from CQDs’ surface fluorophore groups. Interestingly, CA crosslinking significantly increased the water resistance, but it quenched the photoluminescence of composites. The quenching effects were reduced by using CQDs having less reactivity with CA.
研究领域:
材料科学
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高分子化学
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纳米材料
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光物理
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生物医学工程
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DOI
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yi Zhang,Yuhang Liu,Feng Huo,Baowen Zhang,Wenzhen Su,Xiupei Yang
Nanoflakes are materials with high dispersion, a large specific surface area, and a high number of active sites that can provide a good platform for various fluorescence sensors and are very popular among researchers. In this study, a nanoflake-like zinc metal–organic framework (Zn-MOF) was successfully synthesized from the organic ligand 1,2,4,5-tetra(1H-imidazol-1-yl)benzene and zinc nitrate. The synthesized Zn-MOF nanoflakes are extremely soluble in water and exhibit high fluorescence stability. Since Cr2O72– can significantly quench the fluorescence of Zn-MOF aqueous solution, a rapid detection method for Cr2O72– content in water was constructed with a linear range and linear correlation of 0.3–20 μM and 0.992, respectively. The fluorescence quenching constant of the Zn-MOF is KSV = 2.003 × 104 M–1, and the detection limit for Cr2O72– is as low as 0.09 μM. Through the study of fluorescence lifetime and UV absorption, it is proven that the mechanism of Cr2O72– quenching the fluorescence of the Zn-MOF is the inner filter effect. In addition, even after being applied five times, the Zn-MOF still maintained good detection performance for Cr2O72–. The proposed method was successfully applied to the determination of real water samples, confirming that it can be used as an alternative method for the detection of Cr2O72– in environmental samples.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Yanjia Guo,Juan Lu,Wenzhuo Wang,Hanyue Jiang,Guangping Ma,Pengfei Han,Li Tian,Tengying Ma
In this study, we developed novel copper-doped biomass carbon quantum dots (Cu-CQDs) utilizing cantaloupe peel and copper nitrate as precursors. Compared to undoped biomass carbon quantum dots (CQDs), the Cu-CQDs demonstrated a stronger electrochemiluminescent (ECL) signal when reacting with K 2 S 2 O 8 . By employing the synthesized Cu-CQDs as a luminescent reagent, we collaborated with the polymer donor PM6 to construct an innovative solid-state ECL sensor for the trace detection of Rhodamine B (RhB). The solid-state ECL sensor was developed using a layer-by-layer modification approach, sequentially modifying the electrode surface with the polymer donor PM6, Cu-CQDs, and chitosan (CS). The layered structure of the polymer donor PM6 serves as a carrier for Cu-CQDs, enhancing their effective concentration on the electrode surface. Additionally, its electron-donating properties facilitate electron transfer within the sensor system. Chitosan (CS), characterized by its viscosity, was modified as the outermost layer, further enhancing the stability and ECL intensity of the sensor. RhB exhibited a significant quenching effect on the ECL signal of the constructed sensor, with the quenching value being proportional to the logarithm of RhB concentration in the range of 5.0 × 10 −8 to 5.0 × 10 −13 M. This sensor was successfully applied to the detection of RhB in chili samples, providing an effective platform for food safety monitoring.
研究领域:
材料科学
·
分析化学
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食品安全
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纳米技术
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电化学
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产品关联
DOI
高影响因子
Chemosensors
·
2024
·Vol. 12
·期 8
·166
·
IF 3.7
Xiangfang Lin,Qinhui Dong,Yalin Chang,Shusheng Zhang,Pengfei Shi
Luminescent Ag nanoclusters (Ag NCs) are a promising probe material for sensing and bioimaging applications. However, the intrinsic obstacle of poor water stability and photostability greatly restrict their practical application in biological systems. Herein, we report the intracellular hypochlorite (ClO−) detection with amphiphilic copolymer-modified luminescent Ag NCs with good biocompatibility and photostability. The Ag NCs were synthesized by using chemically inert hydrophobic ligands and then modified with an amphiphilic (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(poly(ethylene glycol))-2000]) (DSPE-PEG-2000) and sodium dodecyl sulfonate (SDS) for phase transfer. It was found that the approach of the removal of organic solvents during the phase transfer has remarkable influences on the properties of the Ag NCs, including their size, luminescence property, and aqueous stability. Furthermore, the silver core of Ag NCs could be oxidatively damaged by ClO−, thereby causing photoluminescence (PL) quenching. The ClO−-induced PL quenching was specific over the other common reactive oxygen species (ROS) as well as some common interferences. Finally, they have been successfully applied as a fluorescent nanoprobe for detecting exogenous and endogenous ClO−in living cells.
研究领域:
纳米技术
·
分析化学
·
生物化学
·
材料科学
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生物传感
✓ 已验证
DOI
高影响因子
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