Journal of Nanomaterials
·
2016
·
IF 1.758
Lina Song,Changzhi Yan,Wei Zhang,Haoan Wu,Zhengyang Jia,Ming Ma,Jun Xie,Ning Gu,Yu Zhang
This study reports the synthesis of three kinds of manganese-doped magnetic ferrite nanoparticles (MnFe2O4) in benzyl ether, octyl ether, and 1-octadecene by a simple and low cost thermal decomposition method. It was found that benzyl ether results in a dramatic improvement in nanoparticle crystallinity owing to its stronger reducibility compared to octyl ether and 1-octadecene, as demonstrated by X-ray diffraction and TEM measurements. Raman spectroscopy detection also indicated that the reducing solvent of benzyl ether was in favor of forming magnetite-like structure ferrite, while maghemite-like structured ferrite was obtained in octyl ether and 1-octadecene. The saturation magnetization () of MnFe2O4 synthesized in benzyl ether was 85 emu/g [Fe], which was 3 and 5 times larger than MnFe2O4 synthesized in octyl ether and 1-octadecene, respectively. The specific absorption rate (SAR) of MnFe2O4 nanoparticles synthesized in benzyl ether was 574 W/g, while MnFe2O4 nanoparticles synthesized in octyl ether and 1-octadecene have had much smaller SAR of 76 and 33 W/g, respectively. MnFe2O4 nanoparticles synthesized in benzyl ether also exhibit higher relaxivity ( mM−1 s−1) than those synthesized in octyl ether and 1-octadecene ( and 22 mM−1 s−1). It was obvious that MnFe2O4 nanoparticles synthesized in reducing benzyl ether have higher crystallinity and thus higher , SAR, and values, which can serve as a better candidate for hyperthermia and magnetic resonance imaging.
研究领域:
材料科学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yan-xia Wang,Feng Li,Feng Wang,Yan-feng Pu,Ning Zhao,Fu-kui Xiao
The effects of the polymerization conditions on the yield of insoluble sulfur were investigated by using olefin, such as the 1,-dodecene, 1,-tetradecene, 1,-octadecene as well as acids, such as the salicylic acid, lauric acid and the oleic acid as polymerization stabilizers . The properties of the as-prepared insoluble sulfur were characterized by mu-Raman spectrometer and differential scanning calorimetry (DSC). The results demonstrated that both the olefin and acid stabilizers could couple with the end groups of the IS, thus improved the thermal stability of the IS, and the olefin stabilizers were superior to the acid stabilizers. The stabilizing effect of oleic acid was the best for the acid stabilizers, and the C C in the oleic acid played a crucial role in the stabilization of the IS.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Maolin Liu,Changqing Lin,Weicheng Ou,Zehui Lu,Jiayi He,Xiaojie Chen,Fengbin Liu,Guoxiao Lin,Guojie Xu,Han Wang,Chunyang Pan
Cu:CsPbCl x Br 3-x quantum dots (QDs) with different Cu-to-Pb molar ratios were synthesized via a solvent-based thermal synthesis method, and highly stable blue-light PCL@Cu:CsPbCl x Br 3-x composite fibers (CFs) were prepared by electrohydrodynamic (EHD) technology. The photoluminescence (PL) properties of these Cu 2+ -doped Cu:CsPbCl x Br 3-x QDs and the stability of polymer encapsulation were investigated in this study. The results showed that with increasing Cu 2+ concentration, the CsPbCl 1.5 Br 1.5 QDs maintained their initial cubic crystal structure. The doping of Cu 2+ ions effectively eliminated the surface defects of CsPbCl 1.5 Br 1.5 QDs, facilitating excitonic recombination through radiative pathways. The PL quantum yield (PLQY) of Cu:CsPbCl 1.5 Br 1.5 QDs increased to 85%. In addition, The fiber encapsulation method effectively improved the stability of the Cu:CsPbCl 1.5 Br 1.5 QDs, After 3 days in water, the fluorescence intensity still remains at the initial 90%. Based on these results, it is believed that Cu:CsPbCl 1.5 Br 1.5 QDs have promising applications in optoelectronic devices in the future.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Limin Bian,Lin Chen,Xiong Shen,Jinhe Wei,Fei Hu,Zhongming Wang,Chenglong Lv,Xin Peng,Qiuyun Ouyang
Nonlinear optical (NLO) properties and environmental stability are two important issues in the application of Rb0.25Cs0.75PbBr3/ZnO nanocomposites for NLO devices. We present an easy-to-operate and efficient approach to improving these two issues. The Rb0.25Cs0.75PbBr3/ZnO nanocomposites were synthesized by a hot injection method. The ZnO, Rb0.25Cs0.75PbBr3 quantum dots (QDs) and Rb0.25Cs0.75PbBr3/ZnO nanocomposites were dispersed into methyl methacrylate (MMA) to fabricate the (ZnO)4/polymethyl methacrylate (PMMA), (Rb0.25Cs0.75PbBr3)4/PMMA, and (Rb0.25Cs0.75PbBr3/ZnO)4/PMMA organic glasses (OGs). The nonlinear absorption (NLA) and nonlinear refraction (NLR) properties of the samples were investigated by using the open-aperture and closed-aperture Z-scan technique. The results showed that the NLO properties of the (Rb0.25Cs0.75PbBr3/ZnO)4/PMMA OG were significantly improved compared with those of (ZnO)4/PMMA and (Rb0.25Cs0.75PbBr3)4/PMMA OGs, which can be attributed to the positive synergistic effects between ZnO and Rb0.25Cs0.75PbBr3 QDs. Due to the protective effect of PMMA, the linear absorption properties of the (Rb0.25Cs0.75PbBr3/ZnO)4/PMMA OG showed little change after 28 days to 4 months. In general, the results demonstrate that Rb0.25Cs0.75PbBr3/ZnO nanocomposites have enormous application potential in NLO devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Yi Zhou,Shuping Zhang,Jun Li,Long Liu,Cuifang Wang,Bing Bai,Hsien-Yi Hsu,Ido Hadar,Zongyou Yin,Mark A. Buntine,Xuyong Yang,Guohua Jia
Semiconductor nanotubes manifesting large surface area , high tensile strength , light weight, fast electron transfer kinetics and high biocompatibility have attracted tremendous attention and find widespread applications. Rational design and preparation of semiconductor nanotubes with such a unique morphology to maximum their performance and therefore, to fulfill their applications is still a challenge. Herein, we report a strategy that is capable of rationalizing entry-diffusion of Au + ions into Cu 2-x S nanorods based on the Kirkendall effect , accomplishing consecutive morphology control from solid nanorods to nanotubes , and ultimately to nanorings of Au 2 S. The structure and composition of Au 2 S nanotubes were further confirmed through X-ray photoelectron spectroscopy, annular bright-field scanning transmission electron microscopy-energy dispersive spectroscopy and scanning transmission electron microscopy and Aberration-corrected transmission electron microscopy . Compared with nanorods , Au 2 S nanotubes demonstrated significantly enhanced catalytic activity in electrocatalytic hydrogen evolution reaction , a remarkably low overpotential of 602.0 mV at a current density of −10 mA cm −2 and a relatively low Tafel slope of 36.87 mV dec −1 in 0.5 M H 2 SO 4 solution. It is anticipated that this novel strategy of mediating ion diffusion rate would inspire rational control of unique morphologies and structures of semiconductor nanocrystals , providing a platform for further applications based on nanomaterials .
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Keqiang Chen,Dan Liu,Weiqi Lu,Kaihuai Zhuo,Guogang Li
Shelling with chalcogenides on the surface of lead halide perovskite (LHP) nanocrystals (NCs) is believed to be an effective approach to increase their stability under high-moisture/aqueous conditions, which is important for LHP NC-based optoelectronic devices. However, it is still a challenge to prepare high-quality LHP/chalcogenide core/shell NCs with moisture/aqueous stability. In this work, a surface-defect-induced strategy is carried out to facilitate the adsorption of Br– ions and subsequently Zn2+ ions to preform a bipolar surface, which reduces the energy barrier at the CsPbBr3/ZnS interface and promotes the epitaxial growth of the ZnS shell layer. The aqueous stability of the as-received NCs shows an increase of over 12 times compared to that of the original one. Likewise, Mn2+ ions are introduced to further reduce the geometric symmetry mismatch and defect density at the CsPbBr3/ZnS interface. Interestingly, aqueous stability characterizations illustrate negligible degradation even after 230 min of ultrasonication, suggesting their outstanding stability. This work proposes an effective approach to prepare high-quality LHP/chalcogenide core/shell NCs, which possess great potential in the fabrication of stable optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Naqing Wang,Qixin Huang,Zhehong Zhou,Shaojun Wang,Tao Pang,Lingwei Zeng,Daqin Chen
Synthesis of lanthanide-doped perovskite nanocrystals generally utilizes long-chain ligands like oleylamine and oleic acid at high temperatures up to 260 °C. To tackle this issue, we develop a strategy (temperatures down to 170 °C) to fabricate ytterbium (Yb 3+ )-doped CsPbCl 3 perovskite nanocrystals using the octylamine ligand benefited from its low boiling point and short carbon chain. The as-prepared Yb 3+ -doped CsPbCl 3 perovskite nanocrystals can yield both violet luminescence assigned to exciton recombination and near-infrared emission ascribed to Yb 3+ : 2 F 5/2 → 2 F 7/2 . Structural and spectroscopic characterizations evidence that energy transfer from CsPbCl 3 to Yb 3+ and from defect states to Yb 3+ are simultaneously responsible for the observed Yb 3+ luminescence with quantum yield of 49.5 %. Femtosecond transient absorption spectra confirm that the transferring time scale is within 100 ps, which is much faster than the photoluminescent decay lifetimes of 3000 ps, enabling efficient CsPbCl 3 -to-Yb 3+ energy transfer and thus Yb 3+ luminescence.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
无机化学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Lei Chen,Hui Jiang,Fanghai Liu,Syed Aamir Hussain,Hossein Chamkouri,Yang Song,Ping Chen,Asad Ali,Xianghua Wang
As an alternative to toxic Cd-based blue light-emitting quantum dots (QDs) and chemically unstable perovskite ones, heavy-metal-free and stable ZnSe QDs have great potential for quantum dot light-emitting diode (QLED) displays. Through overcoming the challenge of controllable synthesis of ZnSe QDs with desirable properties, this work reported the synthesis of super-narrow-band blue-emitting ZnSe/ZnS core/shell QDs with full width at half-maximum (FWHM) of photoluminescence/electroluminescence as narrow as 19/20 nm, peaked at 446/449 nm, respectively. The crystallization of the core/shell QDs was well controlled by systematic optimization on the molar ratios of cations to anions and the amount of precursor addition. The coating shell of ZnS, which has a wider band gap than ZnSe, could effectively suppresses the fluorescence tail in the emission spectrum that is caused by defects on the ZnSe core surface, narrowing the FWHM of the emission spectrum and increasing the fluorescence quantum yield of ZnSe/ZnS core/shell QDs. The prepared QLED using ZnSe/ZnS core/shell QDs exhibits superior color purity, particularly suitable for display applications. This work opens up a new route to synthesizing heavy-metal-free ultra-narrow-band blue-emitting QDs.
研究领域:
纳米技术
·
材料科学
·
光电子学
·
显示技术
·
量子点
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhengquan Jiang,Chenglong Wang,Wenwei Ma,Ming Li,Laigui Yu,Shengmao Zhang,Weihua Li
Friction and wear remain formidable challenges for mechanical components in modern industrial applications. Traditional lubricants rely on a combination of additives that synergistically enhance performance but often undergo thermal degradation at increased temperatures, causing mechanical lubrication failure. Trinickel disulfide (Ni3S2) nanoparticles have emerged as promising candidates owing to their excellent tribological properties, chemical stability, and resilience at high temperatures. Compared with nonmagnetic nanoparticles, the magnetic properties of Ni3S2 nanoparticles can quickly form a protective film on the metal surface and reduce mechanical damage. Nevertheless, the conventional synthesis route of Ni3S2 requires high-temperature conditions and the release of toxic gases, resulting in environmental pollution. To address these limitations, we synthesized oleylamine-modified magnetic Ni3S2 nanoparticles (OA-Ni3S2 NPs) through a liquid-phase approach under mild conditions. Transmission electron microscopy (TEM) analysis indicated that OA-Ni3S2 NPs had an average particle size of ∼40 nm. Tribological evaluation in poly-α-olefin-6 (PAO6) base oil, conducted using a four-ball tribometer, revealed that OA-Ni3S2 NPs reduced the coefficient of friction (COF) by 31% and wear scar diameter (WSD) by 40% compared to pristine PAO6, underscoring their exceptional friction-reducing and antiwear performance, while mechanistic studies further clarified the sliding behavior of the nanoparticles at the friction interface. These findings underscore the potential of OA-Ni3S2 NPs as sustainable lubricant additives and provide a promising foundation for their deployment in high-temperature industrial systems.
研究领域:
纳米材料
·
摩擦学
·
润滑工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xiaobo Ding,Hailong Hu,Tailiang Guo,Fushan Li
InP quantum dots have received intensive attention due to their tunable emission wavelengths, narrow bandwidths, and high color purity. Nevertheless, InP quantum dots exhibit notable instability in a complex environment due to their highly oxidizable properties. In this study, we present a strategy for synthesizing InP@Al2O3 nanocomposites that have InP quantum dots evenly embedded in a hybrid substrate containing Al2O3 and coupling-interconnection layers of Si and Al. In addition, we used high-power UV irradiation to repair the defects generated during the synthesis process, leading to photoluminescence (PL) intensity increase of more than 10 times. InP@Al2O3 nanocomposites have demonstrated up to 9 h of laser stability, 30 days of water stability and acid stability and 20 days of alkali stability. It has far exceeded that of InP quantum dots and commercially available phosphors. Distal-type light-emitting diodes (LEDs) with stable and standard white emission can be realized by combining red and green InP@Al2O3 nanocomposites with blue LED chips.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 5
·1-10
·
IF 2.8
Lu Guangliang,Wan Tianqi,Zhai Dabiao,Qin Rao,Li Shuwen,Jiang Jiangang,Wang Yiping,Yu Ruijin,Wang He
The current detection methods for L-Ascorbic Acid (AA) and hydrogen peroxide (H 2 O 2 ) often face limitations in sensitivity, rapidity, and practical application. Addressing these challenges, this study introduces a bidirectional rapid sensing platform based on rare-earth upconversion nanoparticles (UCNPs) for the detection of AA and H 2 O 2 . The developed probe, combining Tm-doped NaYF 4 UCNPs with an iron chelate (SA-Fe III ), leverages the inner filtration effect for efficient detection. By employing both fluorescence and colorimetric methods, the proposed system achieves linear detection ranges of 0–100 μM for AA and 0–71.7 μM for H 2 O 2 , with detection limits as low as 0.1 μM and 0.45 μM, respectively. Furthermore, a smartphone-based image analysis technique demonstrates the potential for rapid, on-site concentration measurements. This work significantly enhances the practicality of AA and H 2 O 2 detection, offering a sensitive, fast, and user-friendly approach that holds promise for applications in clinical diagnostics, food safety, and agricultural stress monitoring.
研究领域:
分析化学
·
生物医学工程
·
食品科学
✓ 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）