Nanoscale
·
2018
·Vol. 10
·期 30
·14546-14553
·
IF 7.233
Dandan Xie,Bin Zhang,Aijuan Zhang,Yongjin Chen,Yanci Yan,Hengquan Yang,Guiwen Wang,Guoyu Wang,Xiaodong Han,Guang Han,Xu Lu,Xiaoyuan Zhou
(Ag,Sn) co-doped Cu3SbSe4 nanocrystals are obtained via a facile microwave-assisted solvothermal method, and their thermoelectric properties are investigated in the temperature range from 300 K to 623 K. Sn-doping on Sb sites dramatically increases the carrier concentration and thus the electrical conductivity, promoting the thermoelectric power factor. Further alloying with Ag on Cu sites strongly suppresses the lattice thermal conductivity close to the glass limit. Aside from point defect scattering, such reduction in lattice thermal conductivity largely relies on the formation of Cu2−xSe nanoinclusions, which serve as additional scattering centers for phonons. Overall, the sample with the nominal composition of Cu2.8Ag0.2Sb0.95Sn0.05Se4 reaches a minimum lattice thermal conductivity of 0.27 W m−1 K−1 and a maximum zT of 1.18 at 623 K, which is the best result for the Cu3SbSe4-based materials in the same temperature region. Our results demonstrate that the microwave-assisted synthesis method is capable of fabricating Cu based ternary compounds with high thermoelectric performance.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jiaojiao Wang,Yanyan Gao,Yuexing Zhang,Dongmei Xu,Zongxin Li,Yifei Su,Fang Wang,Ning Zhang,Daopeng Zhang,Kang Wang,Yuting Chen
A versatile dihydroxylsalicylaldazine-containing fluorene (DHSF) compound was easily prepared through a one-step reaction. DHSF simultaneously exhibited solvent-regulating fluorescent OFF–ON behavior toward Al3+/Cr3+ and a dynamic OFF–ON–OFF fluorescent response toward Fe3+ in different aqueous DMF solutions with multiple absorption–ratiometric signals. These could be mainly attributed to the different binding modes between enol–keto isomers and Fe3+/Al3+/Cr3+, as proved by DFT calculation and IR spectroscopy results. Furthermore, DHSF displayed fluorescent OFF–ON–OFF and absorption–ratiometric dual responses to increasing ClO− amounts. These results, together with the fluorescent ON–OFF changes from the metal displacement of the DHSF–Al3+/Fe3+ system by Cu2+, show that monomolecular DHSF is a versatile chemosensor for sensitively detecting Al3+/Cr3+/Cu2+ and quantitatively analysing Fe3+/ClO− with practical application potential.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 17
·5402-5407
·
IF 0
Chun Huang,Yan Chan,Fangyang Liu,Ding Tang,Jia Yang,Yanqing Lai,Jie Li,Yexiang Liu
Multicomponent chalcogenide Cu2(FexZn1−x)SnS4 nanocrystals were synthesized by a facile solution method. The ratio x of Fe/(Zn + Fe) can be tuned across the entire composition from 0 to 1 by rationally adjusting the Fe/Zn ratio in metal sources. By varying the value of x, the band gap energy of nanocrystals can be readily tuned from 1.25 eV to 1.52 eV. XRD analysis indicates the structure transition from stannite to kesterite may occur at x = 0.4 for Cu2(FexZn1−x)SnS4. In addition, photo-electrical conversion performance can be improved by partly substituting Zn with Fe in Cu2ZnSnS4.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
NANOTECHNOLOGY
·
2013
·Vol. 24
·期 49
·495502
·
IF 3.842
Baocun Zhu,Peilun Yang,Haiqin Yu,Liangguo Yan,Qin Wei,Bin Du
Recently, much attention has been paid to the selective detection and removal of Cu2+ because an excess of Cu2+ can harm the environment and living systems. Herein, we developed a novel water-soluble di-2-picolylamine/proline co-modified Fe3O4@ZnS magnetic fluorescent nanoparticle (MFNP-Cu) for the selective detection and removal of Cu2+ through a dithiocarbamate linkage strategy. The characterization of MFNP-Cu was confirmed by x-ray diffraction (XRD), transmission electron microscope (TEM), magnetization hysteresis loops, infrared (IR) and emission spectra. The results showed that MFNP-Cu could quantifiably detect Cu2+ with high sensitivity and selectivity over a broad pH range (pH 4.1–9). The maximum adsorption capacity of MFNP-Cu was calculated to be about 517.9 mg g−1, which is higher than previously reported. This excellent property was investigated by kinetics equilibrium and thermodynamic studies. Moreover, the removal properties of MFNP-Cu toward Cu2+ from contaminated water samples was achieved by an external magnetic field.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Haoran Zhang,Tianxi Feng,Song Ye,Deping Wang
In this research, the modified upconversion nanocrystals NaYF 4 :Yb,Er were adopted as the precursors for the synthesis of the NaYF 4 :Yb,Er@UiO-66 composite. The XRD, XPS and TEM characterizations indicated that the composite has good crystallinity and uniform morphology. Under 980 nm excitation, the NaYF 4 :Yb,Er@UiO-66 composite exhibits bright upconversion emission that characterized of Er 3+ : 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 radiative transitions. After modified with BPEI (branched polyethyleneimine), the NaYF 4 :Yb,Er@UiO-66/BPEI fluorescence probe was constructed and was used for the detection of Cu 2+ . The results revealed that the integrated emission intensity of Er 3+ displayed a linear relationship with the concentration of Cu 2+ within the range of 5 to 45 μM with a LOD of 0.9615 μM. This study offered a feasible method for constructing UCNC@UiO-66 composites with regular morphology,which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Pingyue Wang,Huanhuan Li,Md Mehedi Hassan,Zhiming Guo,Zheng-Zhu Zhang,Quansheng Chen
In this study, a highly sensitive upconversion fluorescence (FL) biosensor was developed for the detection of organophosphorus pesticides (OPs) based on an acetylcholinesterase (AChE) modulated FL “off–on–off” strategy. The luminescence of synthesized UCNPs could be quenched strongly by Cu2+ due to an energy transfer effect. Upon addition of AChE and acetylthiocholine (ATCh), the enzymatic hydrolysate (thiocholine) could seize Cu2+ from UCNPs-Cu2+ mixture, resulting in the quenched FL triggered on. OPs could irreversibly impede the activity of AChE, which caused the formation of thiocholine to decrease, thus, reduced the recovery of FL. Under the optimum conditions, a linear detection range from 0.1 to 50 ng/mL was achieved for the representative OPs (diazinon) with LOD of 0.05 ng/mL. Furthermore, the ability of the biosensor to detect OPs was also confirmed in adulterated environmental and agricultural samples. In validation analysis, the proposed sensor showed satisfactory results (p > 0.05) with GC–MS.
研究领域:
生物传感技术
·
食品安全检测
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhipeng Guo,Wei Wei,Yihang Li,Xianghong Niu,Fengming Hou,Jin Li,Xiaoke Zhang,Xiuyun Zhang,Ang Wei
Single-atom photo-Fenton (PF) reaction is widely employed for the degradation of antibiotics and water disinfection. However, the key fundamental issues of the valence state cycling of single-atom metals and the activation of hydrogen peroxide (H 2 O 2 ) in the PF process remain indistinct. Herein, we developed a catalyst donated as Cu single atoms anchored hydrangea-like carbon nitride (Cu-SA/CNH) with Cu−N 4 coordination for PF reaction. Compared to pristine CNH, the Cu-SA/CNH exhibited a 2.42-fold increase in PF kinetics. The Cu-SA/CNH/PF system achieved 98.1% degradation efficiency of tetracycline and effectively inactivated Escherichia coli within 30 min. Density functional theory calculations demonstrated that the formation of Cu−N 4 effectively improved the energy of the Cu d orbitals, leading to the generation of intermediate states that facilitated the Cu 2+ /Cu + cycle. The adsorption capacity of Cu d xz orbitals on H 2 O 2 increased nearly 10 times. This work provides valuable insights for enhancing single-atom PF activity to address environmental pollution.
研究领域:
环境科学
·
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Wei Guo,Zhenyu Qiu,Chongshen Guo,Dandan Ding,Tianchan Li,Fei Wang,Jianzhe Sun,Nannan Zheng,Shaoqin Liu
Image-guided phototherapy is considered to be a prospective technique for cancer treatment because it can provide both oncotherapy and bioimaging, thus achieving an optimized therapeutic efficacy and higher treatment accuracy. Compared to complicated systems with multiple components, using a single material for this multifunctional purpose is preferable. In this work, we strategically fabricated poly(acrylic acid)- (PAA-) coated Cu2(OH)PO4 quantum dots [denoted as Cu2(OH)PO4@PAA QDs], which exhibit a strong near-infrared photoabsorption ability. As a result, an excellent photothermal conversion ability and the photoactivated formation of reactive oxygen species could be realized upon NIR irradiation, concurrently meeting the basic requirements for photothermal and photodynamic therapies. Moreover, phototherapeutic investigations on both cervical cancer cells in vitro and solid tumors of an in vivo mice model illustrated the effective antitumor effects of Cu2(OH)PO4@PAA upon 1064-nm laser irradiation, with no detectable lesions in major organs during treatment. Meanwhile, Cu2(OH)PO4@PAA is also an exogenous contrast for photoacoustic tomography (PAT) imaging to depict tumors under NIR irradiation. In brief, the Cu2(OH)PO4@PAA QDs prepared in this work are expected to serve as a multifunctional theranostic platform.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3408-3414
·
IF 10.733
Song Ma,Kai Chen,Yun-Hang Qiu,Li-Li Gong,Gui-Min Pan,Yong-Jie Lin,Zhong-Hua Hao,Li Zhou,Qu-Quan Wang
Substantial effort has been devoted to synthesizing plasmonic metal/semiconductor heteronanostructures with controlled morphology owing to their excellent performance ranging from photocatalysis to optical information processing. However, growing semiconductor heterojunctions with both counterparts in direct contact with the plasmonic metal nanostructures remains challenging. Herein, we report a three-step method to grow CdS–Cu2−xS lateral heteroshells on Au nanoparticles with all components directly connected with each other. Ag2S semi shells are initially grown on the Au nanoparticles as an interim layer, Cu2−xS semi shells are then grown on the uncovered surface of the Au nanoparticles, and CdS is generated by replacing Ag2S and the Au core complex with CdS–Cu2−xS lateral heteroshells Au/CdS–Cu2−xS is finally obtained. These complexes integrate the plasmon resonances of Au in the visible region and that of Cu2−xS in the near-infrared region, and therefore show improved photocatalytic activity and high photothermal efficiency. This study offers a synthetic approach to grow metal sulfides on Au nanostructures which have diverse applications in photocatalysis and photothermal therapy.
研究领域:
材料科学
·
纳米技术
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 30
·14123-14133
·
IF 6.97
Qingwen Guan,Junfei Ma,Wenjing Yang,Rui Zhang,Xiaojie Zhang,Xiaoxiao Dong,Yuting Fan,Lulu Cai,Yi Cao,Yilin Zhang,Neng Li,Quan Xu
Quantum dots, derived from two-dimensional (2D) materials, have shown promise in bioimaging, sensing and photothermal applications, and in white light emitting devices (WLEDs). Herein, nitrogen and phosphorus functionalized Ti3C2 MXene based quantum dots (N,P-MQDs) were successfully prepared through a top-bottom hydrothermal method. This type of photoluminescent quantum dots has realized green fluorescence for the first time at around 560 nm with a photoluminescence quantum yield (PLQY) of 20.1%, the highest ever reported; meanwhile, it also exhibits excellent photostability and pH resistance capacities. Comprehensive characterization and well-resolved density functional theory (DFT) calculation were implemented to determine the mechanism of fluorescence shift and enhancement. Furthermore, the N,P-MQDs have been proved to efficiently act as fluorescent probes for macrophage labeling. In addition, the high sensitivity of the N,P-MQDs toward Cu2+ ions made them a low cost, sensitive, environment-friendly, and label-free fluorescence platform for Cu2+ detection. The outstanding performance of Ti3C2 MXene based quantum dots has demonstrated their great potential to be used as promising fluorescent probes in the fields of biological imaging, optical sensing, photoelectric conversion, etc.
研究领域:
生物成像
·
光学传感
·
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Wanyu Zhang,Jian Liang,Sufeng Wang,Mingyang Lin,Jingshan Li,Li Chen,Yingchao Zhang,Tifeng Jiao
This study reported a new strategy for enhanced Pb 2+ and Cu 2+ sequestration by Artemia cyst shell (shell) supported nano-Mg from aqueous solutions and the carbonated exhausted-adsorbents sequenced potential application in photo-catalyst, which obtained two expected results. One is that the immobilization of nano-Mg onto Artemia cyst shell (shell-Mg) can greatly strengthen the adsorption effect of the neat cyst shell on Pb 2+ and Cu 2+ . The adsorption capacities of shell-Mg for both metal ions reached to 622.01 and 313.91 mg/g, which was 10–15 and 30–50 times that of the neat shell respectively. And shell-Mg has strong selectivity , which was approximately 2–4 times that of shell. The shell-Mg can be used to retrieve Pb 2+ and Cu 2+ from aqueous solutions efficiently. Another is that the carbonated exhausted-adsorbents (C-shell-Mg-Pb and C-shell-Mg-Cu) showed their potential photocatalytic degradation effects on congo red under pH = 4 condition, the decolorization rate reached to 61.19% and 80.39% respectively. Reuse of exhausted adsorbents can avoid the secondary pollution caused by the regeneration, extend the utilization value of exhausted adsorbents, and provide a new viewpoint for the reuse of spent bio-nanomaterial adsorbents.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 90
·87230-87236
·
IF 3.289
Qian Li,Qitong Huang,Jie-Ji Zhu,Wen-Gang Ji,Qing-Xiao Tong
In this paper, a novel quinoline derivative: 8-(pyridin-2-ylmethoxy)quinoline-2-carboxylic acid (Q) has been successfully synthesized, then it was coupled with carbon dots (CDs) to synthesize a CDs–Q nanocomposite by a simple and green method. The CDs–Q nanocomposite can act as a “turn-off” fluorescent chemosensor for detection of Cu2+ ions. It's a good candidate for Cu2+ sensing on account of its excellent properties such as its high sensitivity and selectivity, easy synthesis, excellent fluorescence stability towards temperature and pH, direct detection in aqueous solution and tap water and distinct fluorescence quenching towards Cu2+. We have also discussed the fluorescence quenching mechanism of CDs–Q and the possible coordination mode of CDs–Q with Cu2+. CDs–Q have a wide linear range (0.01–1.2 μM) and high sensitivity towards Cu2+ ions with a detection limit of 0.56 nM. In addition, this fluorescent chemosensor was also applied to determine Cu2+ in tap water with satisfying results.
研究领域:
分析化学
·
材料科学
✓ 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）