JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jinxin Wei,Zhe Hu,Wenjie Zhou,Yi Qiu,Hanqing Dai,Yuanyuan Chen,Zhongjie Cui,Siyu Liu,Haiyang He,Wanlu Zhang,Fengxian Xie,Ruiqian Guo
With the blooming development of zero-dimensional nanomaterials , I-III-VI alloying quantum dots (QDs) with outstanding photoelectrical properties have emerged to attract much attention as promising environmentally-friendly substitutions for conventional binary Cd-based QDs. In this work, a facile one-pot method was introduced to synthesize unreported quaternary Ag-Cu-Ga-Se/ZnSe (ACGSe/ZnSe) QDs. A relatively high photoluminescence quantum yield (PL QY) of 71.9% and a tunable emission from 510 to 620 nm were successfully achieved. We explored the roles of alloying compositions in ACGSe/ZnSe QDs, inferring that increased Ag proportion would not only lower the V defect level which leads to the blue shift of emission, but also slow the ZnSe shelling process owing to the larger lattice distortion. At last, the white light-emitting diodes (WLEDs) were fabricated with ACGSe/ZnSe QDs as the conversion layer, indicating that the as-prepared QDs are a promising candidate for further applications.
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CATALYSIS SURVEYS FROM ASIA
·
2021
·Vol. 25
·期 4
·399-405
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IF 3.106
Xiang Ji,Ju Fan,Sun Man,Jin Hao,Cai Wenjie,Lin Jing,Lu Yanzhen,Dong Xiongzi,Dong Huaze,Wang Fankuo
In this work, we developed a simple and effective one-pot method to synthesize the Pd-based bimetallic nanoparticles (NPs) in the presence of polyvinylpyrrolidone (PVP). By using high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectrometry (EDS) mapping and X-ray diffraction (XRD), the morphologies and compositions of the as-prepared bimetallic NPs were investigated in detail. Furthermore, this approach was also used to achieve the highly dispersive Pd-based bimetallic NPs directly on the carbon black. Significantly, the as-obtained carbon-supported Pd-based bimetallic NPs showed excellent electrocatalytic activity for the methanol oxidation. Among the Pd-based bimetallic NPs and the commercial Pd–C, the PdPt–C displayed the best electrocatalytic activity and stability, which may be mainly attributed to the specific nanostructure and the synergetic effect between Pt and Pd atoms.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Wen Zhang,Bo Li,Yuhan Zhu,Xin Yao,Xiaohe Tian,Shengli Li,Yupeng Tian,Dandan Li
It is considerably meaningful to fabricate a second near-infrared spectral region (NIR-II, 1000–1700 nm) responsive theranostic nanoplatform simultaneously possessing good stability and biocompatibility for efficient and safe cancer treatment. In this work, as a flexible strategy, an intelligent nanoplatform was prepared by using water-soluble cyclic oligosaccharides α-cyclodextrin (α-CD) to load photosensitizer Chlorin e6 (Ce6) onto Fe 3 O 4 @Cu 2−x S core−shell nanoparticles (NPs). The as-synthesized Fe 3 O 4 @Cu 2−x S-Ce6/α-CD NPs are ultrasmall (≈5 nm) and aqueously dispersible, which offer both biocompatibility and renal clearance. Resultly, the obtained Fe 3 O 4 @Cu 2−x S-Ce6/α-CD NPs feature remarkable absorption in the second near-infrared region (NIR-II), which can provide advantages of large penetration depth and high photothermal conversion efficiency (η = 67.88%). Additionally, the introduction of Ce6 can trigger the generation of 1 O 2 under visible light irradiation. Therefore, it provides the proof-of-concept application of functional materials in photodynamic and photothermal combination cancer therapy.
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RSC Advances
·
2021
·Vol. 11
·期 27
·16453-16460
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IF 3.361
Zikuan Shi,Yu Yang,Xin-Yuan Sun,Feng Lang,Liangwu Lin
We demonstrate the influence mechanism on the optical property of Cs4PbBr6 during purification of solution with different protonated levels and polarities. During the purification process, organic groups originating from oleic acid (OA) and PbBr impurity on the surface of Cs4PbBr6 nanocrystals can be removed using high polarity aprotic and protonic solvents, and the number of Br vacancies (VBr) can be reduced. The protonic polar solvent can not only etch the organic groups on the surface of nanocrystals, causing surface reconstruction and particle growth of nanocrystals, but also enter into the lattice of Cs4PbBr6 and react with the embedded CsPbBr3. However, aprotic polar solvent decreases the particle size of Cs4PbBr6 nanocrystals with the increase in the solvent polarity. The optical properties of Cs4PbBr6 can be effectively improved using aprotic polar solvents as a purification solvent, which is very significant to improve the luminescence efficiency of perovskites.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Huizhu Yu,Ming Ma,Liping Jiang,Jie Shen,Fengfeng Xue,Hangrong Chen
Nanomaterial-mediated low-temperature photothermal therapy (PTT) by integrating photothermal agent and heat shock proteins (HSPs) inhibitor holds great potential application in antitumor treatment. A nanoplatform performing improved therapeutic effect that constructed at large scale with green synthesis, high drug loading efficiency, high drug loading capacity, and low cost is highly desired. Herein, we report a metal protoporphyrin-induced self-assembling nanoagent (ZCNA) by integration of hydrophobic Cu 2-x S nanoparticles and zinc protoporphyrin (ZnPP) via a facile volatilization-driven approach without using of any additional stabilizing or carrier material. This nanoagent is featured with simplified preparation, high ZnPP loading efficiency, high ZnPP loading capacity, and excellent biocompatibility. ZCNA acts as a contrast agent for photoacoustic imaging and a photothermal agent for PTT. Meanwhile, the released ZnPP from ZCNA could resist the expression of an important type of HSPs, heme oxygenase-1 (HO-1), and thereby deplete the antioxidant defense systems of tumor cells during PTT, which is responsible for the significantly enhanced antitumor effect of ZCNA in low-temperature PTT in comparison with the non-ZnPP containing Cu 2-x S-based nanoagent both in vitro and in vivo . Overall, the ingeniously constructed ZCNA can be an effective theranostic platform with photoacoustic imaging capability and synergistic antitumor effect to advance the clinical translation of low-temperature PTT-based tumor therapy.
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Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2100012
·
IF 9.926
Yao Tong,Qin Wang,Enrou Mei,Xiaojuan Liang,Wei Gao,Weidong Xiang
All-inorganic perovskite (CsPbX 3 , X = Cl, Br, I) nanocrystals (NCs) with promising optical properties are recognized as a rising star among photoelectric materials, but their inevitable instabilities limit extensive application. Herein, a new one-step strategy for encapsulating CsPbX 3 NCs with porous zeolite via the hot injection method is explored. By altering the mole ratio of PbX 2 , the emission wavelength of CsPbX 3 @zeolite is found to be regularly modulated from blue-emission (CsPbCl 2 Br@zeolite, 436 nm) to red-emission (CsPbBrI 2 @zeolite, 648 nm), thus enabling full spectrum adjustment. Due to the surface passivation of zeolite to CsPbX 3 NCs, CsPbX 3 @zeolite possess an outstanding quantum yield and display excellent thermal/photo/air stability. Subsequently, white light-emitting diodes based on green-CsPbBr 3 @zeolite and red-CsPbBrI 2 @zeolite are constructed and applied to the backlit display, achieving a wide color gamut of 134.2% for NTSC 1953 and 99.8% for Rec. 2020. The CsPbX 3 @zeolite implanted with a polymethyl methacrylate film is used to realize upconversion emission under an 800 nm laser at room temperature. Furthermore, amplified spontaneous radiation based on CsPbBr 3 @zeolite films is achieved. These results convincingly indicate broad application prospects for CsPbX 3 @zeolite prepared via this simple method.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·40-50
·
IF 0
Tan Xiao-Hong,Huang Guo-Bin,Cai Zhi-Xiong,Li Fei-Ming,Zhou Yan-Mei,Zhang Mao-Sheng
The application of all-inorganic CsPbX 3 (X = Cl − , Br − and I − ) perovskite nanocrystals (PNCs) is hindered by their poor stability under different environments (moisture, UV light and high temperature). Herein, we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO 2 @CsPbX 3 @SiO 2 perovskite composites. In this strategy, the environmental stability of CsPbX 3 PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure, and the negative effects of SiO 2 coating on photoluminescence property of CsPbX 3 PNCs could be reduced effectively. Furthermore, regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative fields. The experiment results indicate that the as-prepared product have outstanding abilities of water-, oxidation- and UV radiation resistance. Finally, the SiO 2 @CsPbBr 3 @SiO 2 perovskite composites are successfully used for highly sensitive detection of Fe 3+ in water sample. The results show limit of detection (LOD) is 3 µM and good linearity is between 10 and 70 µM ( R 2 = 0.9963). Furthermore, the proposed perovskite composites have been successfully applied for the analysis of Fe 3+ in real samples with satisfactory results.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Yu Yan,Rongzun Zhang,Yadong Yu,Zhimei Sun,Renchao Che,Bin Wei,Alec P. LaGrow,Zhongchang Wang,Wei Zhou
It remains a great challenge to balance the activity and stability of platinum and Pt-based hydrogen evolution reaction (HER) catalysts in alkaline electrolyte. Herein, two-dimension monolayer Ti 3 C 2 MXene sheets were introduced to support PtNi octahedrons (PtNi@Ti 3 C 2 MXene), which optimizes the activity and stability of PtNi nanoparticles (NPs) through interface interactions between PtNi and Ti 3 C 2 MXene. It shows a small overpotential of 36 mV with a Tafel slope of 59 mV dec −1 at 10 mA cm -2 in 1 M KOH. It also exhibits excellent mass activity of 6.31 mA μg Pt -1 at an overpotential of 70 mV, which is ∼7.1 times that of commercial Pt/C and better than many recent reported Pt-based alkaline HER catalysts. Meanwhile, the PtNi@Ti 3 C 2 MXene gives an increased overpotential of ∼4 mV while the PtNi gives ∼25 mV during a long-time continuous CV cycles. A series of characterizations disclose these interfaces could promote the stability by alleviating the Ni atoms dissolution from surficial PtNi through uniformly lattice strain dispersion of PtNi. Simultaneously, they could keep the activity by interfacial electron transfer from PtNi to Ti 3 C 2 MXene demonstrated both by experimental tests (UPS, electrostatic potential and charge density distribution) and DFT calculation. It could decrease the energy barrier of H 2 O adsorbing and dissociating into hydrogen intermediates, further accelerating the recombination of hydrogen intermediates to H 2 . Under acidic and neutral medium, the electrocatalyst also exhibits improved HER performance compared to its counterparts. This work provides an interface optimization route for developing high-efficiency pH-universal especially alkaline HER electrocatalysts.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Wanjie Xu,Mingwei Ji,Yuanzhi Chen,Hongfei Zheng,Laisen Wang,Dong-Liang Peng
The construction of magnetic colloidal superparticles can utilize the properties from both individual assembly units and their collective interactions; thus, it can meet wider demands in multiple fields. Although many studies have focused on the magnetic oxide superparticles, very limited study has been conducted on magnetic metal superparticles. Herein, we report on the microemulsion-based preparation of Ni colloidal superparticles with tunable sizes and magnetic properties. The prepared Ni colloidal superparticles have a spherical morphology with an average size that can vary from 130 to 700 nm. The key influential factors in the formation of superparticles are being investigated. Magnetic measurements reveal room-temperature superparamagnetic characteristics for all superparticle samples. The calculated interaction energy values indicate that strong magnetic interactions are present in Ni superparticles. Although Ni superparticles with a size of about 700 nm are still room-temperature superparamagnetic, annealed Ni superparticles with a much smaller size of about 390 nm instead exhibit room-temperature ferromagnetic characteristics. This behavior is quite different from that of magnetic nanoparticles. Our results demonstrate that the construction of magnetic colloidal superparticles through adjustments to the parameters of the assembling units may provide them with rich magnetic properties, thus making them useful in a wider range of applications.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·3-10
·
IF 0
Huang Guo-Bin,Guo Zhi-Yong,Ye Ting-Xiu,Zhang Chen,Zhou Yan-Mei,Yao Qiu-Hong,Chen Xi
Cubic phase CsPbBr 3 perovskite nanocrystals (PNCs) was prepared by a high-temperature hot-injection method. The high photoluminescence quantum yield (PLQY) of as-prepared CsPbBr 3 PNCs was 87%, which can be used for the determination of chloridion in domestic water samples based on their wavelength-shift characteristics via halide exchange. The proposal approach for the determination of chloridion reveals a linear correlation ranged from 10 to 200 μM of the chloridion concentration and the wavelength shift of CsPbBr 3 PNCs with a correlation coefficient of R 2 = 0.9956. The as-mentioned method reveals neglectable responses towards those co-existing ions in the water aside from chloridion, due to the quick exchange between Cl and Br and the outstanding color change caused by wavelength shift. The strategy has been applied to the determination of chloridion in water samples with the recoveries of 98.9–104.2% and the limit of detection (LOD) of 4 μM. These results show that the suggested approach is promising for the development of novel fluorescence detection for chloridion in water.
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CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Lin Huang,Zikang Ye,Lei Yang,Jiongzhao Li,Haiyan Qin,Xiaogang Peng
Localization of exciton wavefunctions away from the inorganic–organic interface is proposed for synthesizing colloidal spheroidal quantum dots (QDs) with an ultranarrow photoluminescence (PL) peak width. This strategy is demonstrated by synthesizing uniform-alloy CdxZn1–xSe and CdxZn1–xSe/ZnSe/ZnS core/shell QDs. For blue-emitting QDs, the ensemble PL full width at half-maximum (fwhm) reaches 10.2 nm and the corresponding single-dot PL fwhm is 5.2 nm. The ensemble and single-dot PL fwhm values for green-emitting QDs are 16.3 and 9.7 nm, respectively. These record-low PL fwhm values for spheroidal QDs are close to the requirements for ideal displays. To control the composition homogeneity, the synthetic scheme is separated into four consecutive steps, namely, nucleation of monodisperse CdSe core QDs, epitaxial growth of thickness-controlled CdSe/ZnSe core/shell QDs with a low degree of spontaneous alloying, Cu-catalyzed alloying for uniform-alloy QDs, and additional epitaxy of outer ZnSe and ZnS shells onto uniform-alloy CdxZn1–xSe QDs. Among all metal ions tested, copper ions are identified to be the best catalysts for forming uniform-alloy CdxZn1–xSe QDs, which can enter a QD rapidly to initiate alloying and effectively exit a QD after the alloying process under the experimentally feasible conditions.
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ACS Nano
·
2021
·
IF 15.881
Fan Li,Yuan Zong,Yanling Ma,Mingxu Wang,Wen Shang,Peng Tao,Chengyi Song,Tao Deng,Hong Zhu,Jianbo Wu
To explore the ordering mechanism of facet alloy nanocrystals with randomly distributed atoms, we investigate kinetic and thermodynamic behaviors of the ordering phase transition from face-centered cubic Pt3Co nanocrystals to L12-Pt3Co intermetallic nanocrystals. It is observed that the ordering occurs from the surface and then gradually into the interior in a layer-by-layer mode, involving the competition between two kinds of phase transition modes: long-range surface diffusion-induced phase transition (SDIPT) and short-range reconstruction-induced body phase transition (RIBPT). The density functional theory calculations demonstrate that the surface status acts as a pivotal part in the thermodynamics and kinetics of the nanoscale ordering transition. With the development of the controllable heating process, both SDIPT and RIBPT modes can be manipulated as well as the morphology of the final product. This in situ work lays the foundations for potentially realizing shape-controlled intermetallic nanostructures by utilizing the thermal annealing method and makes preparations for the rational design of the surface and near-surface atomic configurations at the atomic scale.
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