CRYSTENGCOMM
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2013
·Vol. 16
·期 8
·1547-1552
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IF 3.879
Yang Huang,Zanyong Zhuang,Xiaogang Xue,Jinsheng Zheng,Zhang Lin
So far, the photoluminescence (PL) properties optimization of mercaptopropionic acid (MPA) capped CdTe has yet to be understood from a perspective of growth kinetics. In this work, the growth kinetics, size distribution and PL properties of CdTe quantum dots (QDs) grown in MPA aqueous solutions of two extreme concentrations, i.e. 0 mM and 50 mM, were systematically investigated. The studies revealed that CdTe QDs coarsen in low and high concentrations of MPA followed different growth kinetics, i.e. a mixed OA (Oriented Attachment)–OR (Ostwald Ripening) growth and an OA dominated growth, respectively. Moreover, the OR growth in a low MPA concentration solution was found to be disadvantageous for narrowing the size distribution but favourable for enhancing fluorescence, while the OA growth in a high MPA concentration solution is beneficial for focusing and controlling the particle size. Further activation energy calculations indicate that the extra MPA that forbids the OR growth and retards the OA growth is favourable for slowing the particle growth, thus achieving CdTe QDs with a controlled size and narrow distribution. Furthermore, the kinetics study reveals how the introduction of concentrated surface ligands affects the PL properties (FWHM and intensity) of the material.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Renping Cao,Ting Fu,Haidong Xu,Wenjie Luo,Dedong Peng,Zhiquan Chen,Jingwei Fu
CaTiO 3 :Bi 3+ and CaTiO 3 :Bi 3+ , Al 3+ /B 3+ phosphors are synthesized by solid-state reaction method in air. With excitation 272 and 320 nm, broad PL band peaking at 555 nm with full width at half maximum ∼200 nm is observed in the range of 400–800 nm due to the 3 P 1,0 → 1 S 0 transitions of Bi 3+ ion. PLE spectrum monitored at 555 nm contains two PLE band peaking at ∼272 and 320 nm within the range 230–420 nm owing to metal-to-metal charge-transfer and 1 S 0 → 3 P 1 transition of Bi 3+ ion, respectively. The optimal Bi 3+ doping concentration in CaTiO 3 :Bi 3+ phosphor is about 0.5 mol%. Luminescence properties of CaTiO 3 :Bi 3+ phosphor may be improved obviously by co-doping Al 3+ /B 3+ ions, and its emission intensity can be enhanced 13–15 times after Al 3+ ion is co-doped. Luminous mechanism of CaTiO 3 :Bi 3+ phosphor is analyzed by energy level diagram of Bi 3+ ion. Decay curve and time-resolved spectra confirm that only a single type of Bi 3+ luminescence center exists in CaTiO 3 :Bi 3+ phosphor.
研究领域:
材料科学
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光学
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发光材料
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产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Chang Liu,Qing Yang,Hong Lin,Limin Cao,Kaiqiang Wang,Jianxin Sui
Nowadays, obesity severely impacts human health and is the fifth leading risk factor that leads to death globally. Pancreatic lipase (PL) inhibitors have attracted extensive attention owing to their role in effective prevention and treatment of obesity. Here, a shark-derived single-domain antibody fusion protein was used to inhibit PL for the first time. After biopanning, the heterologous expression system pET28a-SUMO-D2 was constructed using the method of double restriction enzyme digestion and T4 ligase to achieve the soluble expression of the PL-specific antibody gene D2. According to the calculation of protein concentration, the final expression of fusion protein PL-D2S was 1.183 mg per liter of Luria Bertani broth. The binding ability of the soluble fusion protein PL-D2S to PL was identified. Enzyme-linked immunosorbent assay results showed that the fusion protein PL-D2S exhibited a strong binding affinity to PL. The experimental results of PL inhibition of PL-D2S in vitro showed that the fusion protein could significantly inhibit the activity of PL, with an IC50 of 404 μg/mL. Our study shows that the fusion protein PL-D2S is a potential PL inhibitor to prevent and treat obesity.
研究领域:
分子生物学
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生物化学
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药学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qinan Mao,Gan Li,Xinyu Shen,Junhua Xi,Lang Pei,Xinyue Li,Jiasong Zhong
Currently, Mn 4+ -activated phosphors have attracted extensive attention for their versatile applications in general lighting, display and plant cultivation. Owing to 3d 3 electronic configuration of Mn 4+ ion, modifying its local coordination environment emerges as a potent method to tailor its luminescence behavior. Herein, a heterovalent substitution strategy is reported to greatly enhance the photoluminescence (PL) of Ba 2 CaWO 6 :Mn 4+ . The effects of the substitution of rare-earth ions (Ln 3+ = Lu 3+ , Y 3+ , Gd 3+ , La 3+ ) for Ca 2+ ions on the PL properties of the phosphor are studied in detail. The PL spectral change of Mn 4+ induced by Ln 3+ substitution is clarified in terms of the local structure of [WO 6 ] octahedron and the valence state of Mn. By selection of Ln 3+ ions and optimization of Ln 3+ doping concentration, the emission intensity of Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor reaches up to 46.3 times as that of Ba 2 CaWO 6 :0.25Mn 4+ . Besides, the Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor exhibits an internal quantum yield of 56.9 % and a thermal stability of 72.6 %@423 K. Finally, Ba 2 Ca 0.85 Ln 0.15 WO 6 :Mn 4+ based phosphor conversion LED devices are demonstrated, which can be potentially employed for indoor plant lighting.
研究领域:
材料科学
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光电技术
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照明技术
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Wanrong Zou,Jiurong Li,Xiao Gong
This paper presents a straightforward synthesis strategy for N, S co-doped carbon nanodots (N, S-CDs), aiming to achieve CDs emitting ultra-wide redshifts while obtaining excellent metal ion detection performance. The N, S-CDs display excellent fluorescence (FL) emission independence regardless of the excitation wavelength or concentration. By introducing a single dopant thiourea, the FL emission of CDs was red-shifted from 445 to 575 nm (∼130 nm). The doped N and S elements are discovered to cause the introduction of defective energy levels and an elevation in oxidation on the surface of CDs, which could potentially be the crucial factor for the ultra-wide redshift of FL emission. Also, it is investigated that solvent engineering is essential for the redshift of the emission peak, which can also be an effective way to synthesize multicolor CDs. Furthermore, the N, S-CDs can be utilized for measuring the water content in methanol solvent based on their solvent effects. Additionally, N, S-CDs have the capability of detecting Mn 2+ with high selectivity and sensitivity. The interaction of CDs with Mn 2+ resulted in an obvious change in both the UV absorption spectrum and FL lifetime. To put it differently, the reaction mechanism between CDs and Mn 2+ probably includes mixed processes of dynamic and static quenching. Zeta potential tests additionally indicate that the FL quenching is strongly correlated with the surface condition of CDs. The outcomes and discoveries offer a fresh and viable method for achieving the simultaneous production of long-wavelength glowing CDs and their analysis and detection of metal ions as fluorescent probes.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Liu Peng,Wang Qiang,Li Kuan,Bi Bo,Wen Ying-Fei,Qiu Miao-Juan,Zhao Jing,Li Bin-Bin,Zhang Chang-Hua,He Yu-Long
Iron as an essential element, is involved in various cellular functions and maintaining cell viability, cancer cell is more dependent on iron than normal cell due to its chief characteristic of hyper-proliferation. Despite that some of the iron chelators exhibited potent and broad antitumor activity, severe systemic toxicities have limited their clinical application. Polyaminoacids, as both drug-delivery platform and therapeutic agents, have attracted great interests owing to their different medical applications and biocompatibility. Herein, we have developed a novel iron nanochelator PL-DFX, which composed of deferasirox and hyperbranched polylysine. PL-DFX has higher cytotoxicity than DFX and this effect can be partially reversed by Fe2+ supplementation. PL-DFX also inhibited migration and invasion of cancer cells, interfere with iron metabolism, induce phase G1/S arrest and depolarize mitochondria membrane potential. Additionally, the anti-tumor potency of PL-DFX was also supported by organoids derived from clinical specimens. In this study, DFX-based iron nanochelator has provided a promising and prospective strategy for cancer therapy via iron metabolism disruption.
研究领域:
肿瘤学
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药学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Tiansong Dai,Guifang Ju,Yang Lv,Yahong Jin,Haoyi Wu,Yihua Hu
Here, a new LiYGeO 4 : Eu 3+ phosphor exhibiting long red persistent luminescence (PerL) is developed herein. Experimental results show that LiYGeO 4 : Eu 3+ with a low doping concentration of Eu 3+ emits high-intensity red PerL, which lasts for more than 21 h. The red PerL of the preirradiated LiYGeO 4 : Eu 3+ phosphor can be repeatedly excited to increase its intensity via short-term stimulation using low-energy near-infrared (NIR) light. Furthermore, LiYGeO 4 : Eu 3+ exhibits strong intrinsic emission, enhancing the f-f emission of Eu 3+ . The PerL emission, photoluminescence (PL) emission, and thermoluminescence (TL) spectra are identical, suggesting the emission originating from the host and Eu 3+ center. TL measurements were conducted to intensively study the trap characteristics of LiYGeO 4 : Eu 3+ using the Booth-Bohun and T m -T stop methods. Results reveal the underlying mechanism of the PerL and the importance of Eu 3+ as the introduced traps in LiYGeO 4 : Eu 3+ . LiYGeO 4 : Eu 3+ with a high doping concentration of Eu 3+ exhibits excellent PL properties and thermal stability, with its quantum efficiency surpassing those of commercial phosphors such as Y 2 O 3 : Eu 3+ , suggesting its potential application in solid-state lighting. Thus, the doping of LiYGeO 4 : Eu 3+ with low and high concentrations of Eu 3+ can be helpful in fabricating materials exhibiting different luminescence properties.
研究领域:
材料科学
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光学
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光子学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
N.R. Khalid,Hamid Ishtiaq,Faisal Ali,M.B. Tahir,Sumaira Naeem,A. Ul-Hamid,M. Ikram,T. Iqbal,M. Rizwan Kamal,Hussein Alrobei,Meshal Alzaid,A. Dahshan
The fast pace of industrial growth during the current decade has seen a large family of dyes employed copiously in the production of various products such as paper and ink. These dyes pollute earth's ecosystems. Researchers look at various ways to degrade these dyes including the use of suitable nanomaterials . ZnO is an important semiconductor material that can be employed for this purpose. In this research work, we optimized the photocatalytic capability of ZnO by co-doping it with 1–7 wt% of Bi and N. The synthesized Bi and N co-doped ZnO nanorod samples showed excellent photocatalytic behavior towards Rhodamine-B (RhB). It was confirmed using XRD and SEM that (5, 2.5) wt.% Bi/N co-doped ZnO nanorods exhibited unique morphology and structure. EDX successfully assessed the elemental composition of the synthesized samples. To provide further insight into its microstructure, the HRTEM and SAED analysis were performed. Optical properties were determined using PL and UV–Visible spectroscopy. The prepared nanorod material degraded almost 89% of RhB in 180 min. The superior degradation ability of co-doped ZnO material when exposed to visible portion of sunlight spectrum is credited to the decrease in the recombination rate of charges and an increase in the depth penetration of photons. The degradation efficiency of Bi/N co-doped ZnO material is enhanced due to reduced recombination rate and increased production of number of defects and oxygen vacancies .
研究领域:
材料科学
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环境科学
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化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Shuqi Wu,Yang Li,Ruofei Zhang,Kelong Fan,Weihang Ding,Letong Xu,Lianbing Zhang
Multifunctional nanocomposites that possess imaging and high-performance therapeutic features are experiencing a surge in interest in the precision clinical anticancer treatment. In this work, we reported the fabrication and bio-application of a novel persistent luminescence-polypyrrole nanocomposite ( [email protected] ) for photoacoustic/persistent luminescence (PA/PL) dual-modal imaging guided photothermal therapy (PTT). The construction of [email protected] avoids the PL quenching of LPLNP-OH by the polypyrrole-coating, and thus enables the combination of PL and PTT. The [email protected] shows excellent biocompatibility, long lasting near-infrared (NIR) PL emitting without in situ excitation and high-contrast PA signals. Meanwhile, this nanocomposite exhibits strong NIR absorbance and exceptional photothermal conversion capability, which provides notable potential for imaging-guided antitumor therapy. Thus, our work highlights the dual-functional core-shell [email protected] as a feasible theranostic nanoplatform for cancer diagnosis and therapy.
研究领域:
生物医学工程
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纳米技术
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癌症研究
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诊疗一体化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 15
·3757-3764
·
IF 5.256
Jiang-Shan Shen,Jia-Jia Wu,Xiang-Ying Sun,Zhen-Long Wu,Ping Gao,Bin Liu
We found that β-HgS nanocrystals could catalyze the reactions of oxidase substrates such as 3,3′,5,5′-tetramethylbenzidine (TMB) and O-phenylenediamine (OPD) to form coloured and fluorescent products, respectively, but α-HgS nanocrystals could not catalyze these reactions. Further investigation revealed that the predominantly exposed crystal planes may play an important role in determining the catalytic activity. On the basis of these findings, taken together with the reaction of forming a Schiff base between the –NH2 group of OPD and the –CHO group of formaldehyde, a novel, simple, and highly selective photoluminescence (PL) sensing platform for detecting formaldehyde could thereby be successfully developed.
研究领域:
纳米技术
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Lei Han,Xi Yuan,Zitong Wang,Jie Hua,Jin Wang,Jinju Zheng,Jialong Zhao
Mn-doped two-dimensional lead halide perovskites nanoplatelets (NPLs) possess promising application in solid state lighting. The Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs with corporation of Cd 2+ were prepared via a hot injection method. The photoluminescence (PL) properties the NPLs with different Mn/Pb/Cd molar ratio from 0.5/1/0 to 5/1/3 were investigated by steady-state and time-resolved PL spectroscopy, indicating that the doping efficiency of Mn 2+ can be boosted by adding Cd 2+ to the NPLs. After thermal annealing, the PL quantum yield of Mn 2+ ions reached up to 75%, which is Cd 2+ content dependent. The temperature-dependent PL spectra demonstrated that the thermal activation energies of the NPLs could be increased by incorporating Cd 2+ , meaning that the nonradiative defect/trap states were effectively suppressed. These experimental results suggested the PL properties of Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs were optimized by adding Cd 2+ ions.
研究领域:
材料科学
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光电学
·
固态照明
✓ 已验证
DOI
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2026
·
IF 4.8
Xiaojie Ding,Kexin Cao,Yan Li,Xinchun Li,Qiu Zhong,Yong Chen,Mengnan An,He Liu,Rujun Zhou,Yuanhua Wu
Nanocarrier-mediated delivery of double-stranded RNA (dsRNA) is a promising strategy for plant disease control. Our previous study has shown that the self-assembled ε-poly- l -lysine/carboxymethyl chitosan (ε-PL@CMCS) nanocarrier significantly improves the efficiency of RNA interference (RNAi) against Rhizoctonia solani AG3 TB. However, the molecular mechanisms underlying this enhancement and the potential ecological impacts on phyllosphere microbial communities remain unclear. In this study, we confirmed that ds RsGH1 @ε-PL@CMCS had no adverse effects on the growth and development of plants. Transcriptome analysis revealed that DEGs were significantly enriched in ‘SNARE interactions in vesicular transport’ pathway. Among them, ds RsGH1 @ε-PL@CMCS specifically upregulate the vesicle transport protein SEC22 in Nicotiana tabacum. Surface plasmon resonance (SPR) assay demonstrated that the ds RsGH1 @ε-PL@CMCS binds to SEC22 protein with 7.6-fold higher affinity than that of the naked ds RsGH1 . Silencing SEC22 in the ds RsGH1 @ε-PL@CMCS treatment reduced the silencing efficiency of RsGH1 from 53.3% to 39%, confirming its essential role. Concurrently, high-throughput sequencing revealed that SIGS treatments did not disrupt bacterial community structure but increased fungal diversity and suppressed the pathogen, while enriching beneficial fungi such as Tulasnella . Our findings elucidate a molecular link between nano-bioprotectant ds RsGH1 @ε-PL@CMCS-enhanced RNAi and host vesicle transport, while confirming the biocompatible and microbiome-modulating potential. This provides a dual perspective for developing efficient and sustainable RNAi-based strategies for protecting plants.
✓ 已验证
DOI
PubMed
高影响因子
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