INORGANIC CHEMISTRY
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2019
·
IF 4.85
Diwei Zhang,Jing Zhao,Quanlin Liu,Zhiguo Xia
All-inorganic halide perovskite (CsPbX3, X = Cl, Br, or I) nanocrystals (NCs) have been widely studied due to their outstanding optoelectronic properties. However, some inevitable factors like light, heat, and moisture affected the stability of CsPbX3 NCs and further limited their practical application. In this work, the stability of all-inorganic halide perovskite NCs can be improved by integrating them in the stable Zr-based metal–organic frameworks (Uio-67). Compared to pristine perovskite NCs, typical CsPbBr3@Uio-67 composites display a stable photoluminescence property that can be maintained for 30 days under ambient atmospheric conditions. Due to the proposed confinement effects of CsPbX3 NCs coordinated with the pore structures of Uio-67, the related structural model of CsPbX3@Uio-67 composites was elucidated. White LED device was further fabricated by combining CsPbBr3@Uio-67 composites and commercial K2SiF6:Mn4+ red phosphors with a blue-emitting chip, which demonstrated a wide color gamut (138% of National Television Standards Committee color space). The strategy on encapsulation of CsPbX3 NCs into Uio-67 will open up a stable platform for optoelectronic applications.
研究领域:
材料科学
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光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Juan Yang,Pei Li,Zailing Song,Jie Li,Huan Yang,Fan Yan,Lu Li,Can Xu,Junlang Chen,Liang Chen
Graphene quantum dots (GQDs) have shown growing potential in the applications of ion detection, anti-counterfeiting ink and light-emitting devices. However, the photoluminescence (PL) properties of GQDs will be lost when they interact with some heavy metal ions. Effective strategies to improve PL stability are still limited. In this work, we prepared a new kind of GQDs modified by scandium ions (Sc 3+ ) to improve the PL of GQDs in aqueous solution containing heavy metal ions. The Sc 3+ modified GQDs (Sc@GQDs) show a slight fluorescence enhancement compared with pristine GQDs. In addition, the PL of pristine GQDs could be quenched by Fe 3+ /Cu 2+ /Cr 3+ , while the PL of Sc@GQDs was kept stable with these heavy metal ions. Meanwhile, GQDs modified by Al 3+ and Ga 3+ exhibit similar results, which further verifies the universality of this method that GQDs modified by specific metal ions to maintain the PL of GQDs with heavy metal ions. As applications, Sc@GQDs may have great potential in the fields of fluorescent flexible device and fluorescent ink.
研究领域:
材料科学
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光学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
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IF 5.091
Feng Chen,Liucan Wang,Yuxin Xing,Jixi Zhang
The photoluminescence stability of lanthanide complex in aqueous media is a prerequisite for diagnostics probes . The combination of building blocks working in concert to facilitate host–guest structures is now considered state of the art in surpassing this roadblock, yet there still remains a tremendous challenge. Here, a stable, highly-luminescent system was developed through trapping anionic complexes sensitized by tridentate pyridine-tetrazolate (pytz) ligands within the rigid framework of ZIF-8 (zeolitic imidazolate framework-8) particles (∼60 nm in size). The key to maintaining the stable luminescence of lanthanide complexes inside ZIF-8 frameworks is a stopcock design, i.e. stopper molecules (an imidazolium based ionic liquid) selectively plugged on the pore entrances located at the exterior surface of the ZIF-8 host, which protect both the host and the guests from deteriorations by surrounding ions/water molecules. Remarkably, the obtained Ln complex encapsulated ZIF-8 particles (Ln = terbium , europium) particles possessed high quantum yields (23.2% and 8.5%), large absorption cross-section (∼10 −12 cm 2 ), and long luminescence lifetimes (1.9 and 3.0 ms) in PBS buffer. In addition, the system can realize single/multi-color encoding by altering the loading amounts and the weight ratios of complexes emitting at different wavelengths.
研究领域:
化学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
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IF 5.6
Jiajun Zhong,Minghao Ge,Tongxu Gu,Tong Wang,Zhizhou Liu,Pengli Bai
Single-nanoparticle counting (SNPC) based on fluorescent tag (FT) stands out for its capacity to achieve amplification-free and sensitive detection of biomarkers. The stability and luminescence of FT are important to the sensitivity and reliability of SPNC. In this work, we developed novel perovskite/silica nanocomposites by in-situ nanoconfined growth of CsPbBr 3 nanocrystals inside mesoporous structure of silica nanoparticles. PbBr(OH) was formed in an alkaline-assisted reaction triggered by water on the surface of CsPbBr 3 nanocrystals. The as-obtained nanocomposites, featuring dual protection from silica matrix and PbBr(OH), exhibited high absolute photoluminescence quantum yield (PLQY) of 86.5% and demonstrated outstanding PL stability confronting with water, heat, ultrasound and UV-irradiation, which is desired by SNPC-based biosensor. Thereafter, these nanocomposites were used to construct an operationally friendly SNPC assay for the amplification-free quantification of cancer-associated miRNA. Quantitative detection of miRNA could be accomplished by directly counting the number of nanocomposites using a flow cytometer in this assay. This strategy did not ask for multiple washing steps and demonstrated specific and sensitive detection of miRNA 21, which exhibited a dynamic range of 1–1000 pM and limit of detection of 79 amol. The employment of highly stable perovskite/silica nanocomposites improved the test reliability and stability of SNPC, revealing the vast potential of perovskites in biosensing.
研究领域:
材料科学
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纳米技术
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生物传感器
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
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2021
·Vol. 9
·期 13
·2998-3004
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IF 6.331
Jia An,Yongqin Hu,Guoyi Liu,Meizhu Chen,Rubing Chen,Ying Lyu,Mengdi Yuan,Mengfei Luo,Yufei Liu
Considering the limited sensitivity and accuracy of single-signal assay strategies, the multi-signal assay strategy has sparked significant excitement in recent years. In this study, for the first time, we reported a one-pot method in situ synthesis of carbon-containing nanoparticles (CNPs) via p-aminophenol (AP) and diethylenetriamine (DETA). The CNP solution exhibits yellow and light blue fluorescence under UV-light. Moreover, the CNPs exhibited excellent photoluminescence stability even under extreme conditions. Inspired by the alkaline phosphatase (ALP)-triggered specific catalytic reaction, we constructed an ultrasensitive fluorescence and colorimetric two-channel strategy for monitoring the ALP activity. By optimizing the detection parameters, the detection limits for both fluorometric and colorimetric were 0.05 mU mL−1. Moreover, the strategy showed high specificity and was successfully applied to monitor the ALP activity level in human serum samples. The analytical strategy opened a new window for the detection of the ALP activity, screening of the ALP inhibitor, and disease diagnosis.
研究领域:
分析化学
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生物传感器
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纳米技术
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医学诊断
✓ 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）