Nano Energy
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2020
·
IF 16.602
Qi Wang,Guang-Jie Xia,Zhi Liang Zhao,Yuanmin Zhu,Xiaobo Shi,Limin Huang,Yang-Gang Wang,Meng Gu
The carbon monoxide (CO) interaction effect on active Pt-based catalysts is critical because the surface reconstruction and phase separation behavior of bimetallic catalysts in a CO environment can profoundly impact the catalysts’ activity and durability. However, because direct and dynamic observation has proven elusive, the exact failure mechanisms of the nanocrystal structural modifications induced by CO are poorly understood. In this work, we probe the dynamic structural and compositional transformations of an individual PtPb@Pt nanoplates in a CO gas atmosphere via in-situ environmental transmission electron microscopy (ETEM) and confirmed with theoretical calculations. The interaction of Pt and Pb atoms with CO molecules are revealed dynamically, including the resulting breakdown of the PtPb@Pt nanoplates. The Pt atoms aggregate on surface facets of the original PtPb lattice and the Pt-CO complex mobilizes, cracking the Pt surface layers and stripping Pb atoms from the PtPb alloy core to form Pb(CO) 4 . These interactions provide direct clues for the failure analysis of the catalyst and, thus, represent a critical step towards the design of an anti-CO interaction catalyst.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Zhao Yubin,Xie Cong,Song Yuxiang,Yang Ping
The photoluminescence (PL) of doped ions is depended strongly on the position of the ion in the substrate. Ion doping endows semiconductor nanocrystals with novel properties. In this paper, Mn:CsPb(Cl/Br) 3 nanocrystals (NCs) with different halogen ratios were obtained by one-pot hot injection synthesis and halogen ion exchange. The emission of Mn 2+ from 4 T 1g - 6 A 1g d-d transition was observed in the case of changing the molar ratio of Cl/Br for Mn:CsPb(Cl/Br) 3 NCs. In the case of a Cl/Br ratio of 4/1, the PL peak of perovskite became weak and Mn 2+ emission was enhanced. After I − ion exchange, the emission of Mn 2+ was observed in Mn:CsPb(Cl/Br) 3 with Cl/Br ratio of 1/4, in which the PL efficiency of the nanocrystals reached 55.74%. Thus, Cl − ions increase the band gap and effectively promote the emission of Mn 2+ . At the same time, the morphology of the samples after ion exchange always remains cube. The lifetimes of the nanocrystals were short aged with increasing Cl − ions and prolonged with increasing I − ions. Because these Mn:CsPbX 3 (x = Cl, Br, I) NCs with different halogen ratios revealed highly stabile blue to red emission, the nanocrystals would be utilizable for further applications.
Graphical abstract
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Nanoscale
·
2020
·Vol. 12
·期 25
·13688-13696
·
IF 6.895
Ping Li,Cheng Du,Xiaohui Gao,Zhihua Zhuang,Dong Xiang,Chunmei Zhang,Wei Chen
Morphology modulation and surface structure-controlled synthesis are two effective ways to tune the electrocatalytic activities of metal nanomaterials. Pt-based binary or ternary metal nanostructures have become a class of promising catalysts toward the oxygen reduction reaction (ORR) and the methanol oxidation reaction (MOR) for direct methanol fuel cells. Herein to reveal the morphology and surface structure effects of one-dimensional (1D) Pt-based nanostructures on their electrocatalytic properties, two types of 1D CuPt nanowires (CuPt NWs) and CuPt nanotubes (CuPt NTs) with tunable surface structures and compositions were fabricated using a convenient and easy strategy. It was found that among all the studied samples, CuPt2.22 NWs exhibited the highest efficiency catalytic performances for both the ORR and MOR in an acidic electrolyte. For the ORR, CuPt2.22 NWs exhibited an onset potential (Eonset) of 0.749 V and a half-wave potential (E1/2) of 0.577 V, which are more positive than those of the commercial Pt/C (0.668 V and 0.558 V). On the other hand, CuPt2.22 NWs show a specific activity of 20.76 mA cm−2 and a mass activity of 0.171 mA μgPt−1 for the MOR, which are 7.75 and 1.82 times, respectively, larger than those of Pt/C (2.679 mA cm−2 and 0.094 mA μgPt−1). Meanwhile, the reaction mechanism of the MOR on CuPt2.22 NWs was examined by in situ FTIR. From the enhanced IR absorption, the linear- and bridge-adsorbed CO intermediates can be determined during the methanol oxidation on CuPt2.22 NWs, from which the MOR proceeds through a dual reaction pathway. This work reveals that rationally tuning the electronic structures of 1D metal nanomaterials by well-controlling the composition and surface morphology on the nanoscale could greatly enhance the catalytic properties, which are very important for their application in fuel cells.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Anzi Yang,Xiaoxia Huangfu,Lixiao Liu,Wen Luo,Wenbo Zhao,Jun Yin
Biomedical detection needs to develop more detection methods and reagents. CuFeS 2 , an I-III-IV ternary semiconductor material, has attracted great interest of researchers because of its optical, electrical, low toxicity and controllable chemical synthesis. Here, we synthesized CuFeS 2 quantum dots (QDs) with hot-injection method and their ECL behaviors were investigated for the first time, involving the co-reactant anode/cathode ECL emission and the related ECL mechanism. Moreover, a novel ECL immunosensor based on CuFeS 2 QDs for the ultrasensitive detection of Cyclin D1 (CCND1) was designed and prepared. CuFeS 2 QDs with uniform size and excellent optical properties were used as ECL emitters and Carboxyl Fe 3 O 4 magnetic beads (MB) were utilized for magnetic separation of CCND1 from MCF-7 cells treated by sophora frevescens. In addition, reduced graphene oxide (rGO) and Au NPs by electrodeposition not only provided plentiful active sites for the immobilization of anti-CCND1 (primary antibody, Ab 1 ), but also enhanced the conductivity of the electrode. Results indicated that under the optimal condition, the ECL signal was proportional to the logarithmic of CCND1 concentration in the linear range from 40 fg/mL to 0.8 μg/mL with a detection limit of 15.8 fg/mL. Further, the good reproducibility, stability and selectivity of the as-prepared ECL immunosensor were also proved. Significantly, the anticancer effect of sophora frevescens on MCF-7 cells was investigated through quantitative analysis of overexpression of CCND1, which was related to proliferation of cancer cells. This research indicated the ECL immunosensor we suggested could offer great potential for the follow-up research in clinical diagnosis and anticancer drug screening.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 39
·9084-9093
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IF 5.344
Jiaxin Zuo,Minfeng Huo,Liying Wang,Jia Li,Yu Chen,Ping Xiong
Nanomedicine that enables multiple synergetic treatments provides effective non-invasive treatment modalities for cancer therapy. Yet treatments for oral squamous cell carcinoma (OSCC) are rarely reported. Here, we designed OSCC-targeting multi-functional nanomedicines to overcome the therapeutic obstacles during OSCC treatments, including ineffective chemotherapy, and the traumatic surgery and radiotherapy. The urokinase plasminogen activator receptor (uPAR)-targeting ligand AE105 decorated dendritic mesoporous silica nanoparticles (DMSN) encapsulating photonic active ultrasmall Cu2−xS NPs and sonosensitizer Rose Bengal (RB) have been rationally designed and constructed (designated as Cu2−xS-RB@DMSN-AE105, abbreviated as CRDA). These CRDAs initially target the uPAR, which is overexpressed in the OSCC cell membrane, to increase the localized accumulation of CRDAs at tumor sites. Under the irradiation of both near-infrared laser and ultrasound, the in situ photonic-hyperthermal and sonodynamic effects are respectively enabled to induce the cell death of OSCC. Upon both in vitro/in vivo challenges, tumor cells/xenografts have been efficiently eradicated, achieving the targeting and synergetic treatment modality against the OSCC with satisfactory biocompatibility.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Ruiqi Guo,Jie Meng,Weihua Lin,Aqiang Liu,Tönu Pullerits,Kaibo Zheng,Jianjun Tian
CuInSe 2 (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn 2+ ) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn 2+ during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the charge carrier lifetime of Mn-CISe QDs is much longer than that of the CISe QDs, due to the Mn 2+ doping state serve as hole capturer forming a charge-compensated pair with the Cu 2+ defect that makes the long-lived Cu 2+ radiative recombination dominate. Furthermore, Mn 2+ doping concurrently modifies the conduction band minimum and valence band maximum level of the QDs verified by the ultraviolet photoelectron spectroscopy (UPS), which determines the driving force for charge carrier transfer to acceptors. The optimal Mn 2+ doping level (0.01 Mn:Cu feed ratio) balanced the above two factors in the QDs. The detector based on such Mn-CISe QDs exhibits responsivity of 30 mA/W and specific detectivity of 4.2 × 10 12 Jones at near-infrared wavelength, the response speed of 0.76 µs, and suppressed dark current density of 1.6 × 10 −10 A cm −2 .
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 34
·14438-14446
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IF 3.288
Rongmu Lv,Keke Du,Qianqian Liu,Xiangyu Meng,Lizhu Chen,Zhifei Wang
Efficiently, enhancing intracellular oxidative stress via increasing intracellular hydroxyl radicals (˙OH), which is based on the Fenton reaction and lowering glutathione (GSH) is a promising approach for cancer treatment. Herein, we synthesized a new alloy nanomaterial, Fe5Cu3O@BSA (FCB) with good dispersity aimed at introducing copper ions to improve the Fenton reaction efficiency and reduce GSH. Under the weak acid microenvironment at the tumor, FCB can release Fe2+ and Cu2+ and the released free electrons are expected to combine with oxygen to further generate H2O2, leading to an excessive production of H2O2 in the cells. Meanwhile, the released Fe2+ and Cu2+ can not only perform a higher reaction efficiency on producing ˙OH but also consume GSH, which dramatically increases the intracellular oxidative stress in both directions. In vitro experiments showed that the incubation of human breast cancer cells (MCF-7 cells) with 100 μg mL−1 FCB nanoparticles resulted in a 65.9% mortality rate after 24 h. The in vivo experiments showed that FCB could effectively inhibit tumor growth. In this study, a therapeutic strategy based on metal biomaterials with good biocompatibility was established to effectively enhance oxidative stress and has great potential in tumor treatment.
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Journal of Materials Chemistry B
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2020
·Vol. 8
·期 32
·7213-7224
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IF 5.344
Xiao-Pei Li,Kai-Yun Qu,Feng Zhang,Han-Ning Jiang,Ning Zhang,Cheraga Nihad,Chao-Ming Liu,Kai-Hong Wu,Xiao-Wei Wang,Ning-Ping Huang
The field of cardiac tissue engineering has made significant strides in therapeutic and pharmaceutical applications, highlighted by the development of smart biomaterials. Scaffolds with appropriate properties mimicking the nature of a heart matrix will be highly beneficial for cardiac tissue engineering. In this study, high-aspect-ratio water-dispersed gold nanowires (AuNWs) were synthesized and incorporated into gelatin methacrylate (GelMA) hydrogels, demonstrating enhanced electrical conductivity and mechanical properties of the biomaterial scaffolds. Cardiac cells cultured on GelMA–AuNW hybrid hydrogels exhibited better biological activities such as cell viability and maturation state compared to those cultured on GelMA hydrogels. Moreover, cardiomyocytes showed synchronous beating activity and a faster spontaneous beating rate on GelMA–AuNW hybrid hydrogels. Our strategy of integrating high-aspect-ratio water-dispersed gold nanowires within gelatin methacrylate hydrogels provides a favorable biomaterial scaffold to construct functional cardiac tissue for further applications in cardiac tissue engineering and drug screening.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Fengxia Wu,Kamel Eid,Aboubakr M. Abdullah,Wenxin Niu,Chao Wang,Yixiang Lan,Ahmed A. Elzatahry,Guobao Xu
Multidimensional bimetallic Pt-based nanoarchitectonics are highly promising in electrochemical energy conversion technologies because of their fancy structural merits and accessible active sites; however, hitherto their precise template-free fabrication remains a great challenge. We report a template-free solvothermal one-pot approach for the rational design of cocentric PtNi multicube nanoarchitectonics via adjusting the oleylamine/oleic acid ratio with curcumin. The obtained multidimensional PtNi multicubes comprise multiple small interlace-stacked nanocube subunits assembled in spatially porous branched nanoarchitectonics and bound by high-index facets. The synthetic mechanism is driven by spontaneous isolation among prompt nucleation and oriented attachment epitaxial growth. These inimitable architectural and compositional merits of PtNi multicubes endowed the ethanol oxidation mass and specific activity by 5.6 and 9.03 times than the Pt/C catalyst, respectively, along with the enhancement of methanol oxidation mass activity by 2.3 times. Moreover, PtNi multicubes showed superior durability and a higher tolerance for CO poisoning than the Pt/C catalyst. This work may pave the way for tailored preparation of Pt-based nanoarchitectonics for myriad catalytic reactions.
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高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Fan Sui,Mingyue Pan,Zhengyan Wang,Ming Chen,Wenjie Li,Yan Shao,Weimin Li,Chunlei Yang
The emission and absorption properties of Mn doped CsPbCl 3 NC make it ideal candidates as luminescent down shifting layer material for solar cells, However, effective Mn doping and further quantum yield improvement remains challenging. We present our modified hot injection route to obtain Mn doped CsPbCl 3 nanocrystals with different morphologies and enhanced quantum yield. The samples presented were synthesized with precursor MnCl 2 and PbCl 2 with the ratio of 1:1, 1:2, 1:2.5 and 1:3. For samples with lower Mn doping level, the as prepared samples are uniform nanocubes with average size of 11 nm. When MnCl 2 amount is increased beyond 2.5, large piece of nanosheets were found by TEM and AFM with ultrathin thickness and strong quantum confinement effect. CsPbCl 3 nanocrystals with optimal Mn doping level show enhanced quantum yield of 69%. Luminescent down shifting layers prepared from Mn doped CsPbCl 3 nanocrystals successfully increased short-circuit current (6.67%) and PCE (1.67%) of Cu(In,Ga)Se 2 solar cell.
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高影响因子
BULLETIN OF MATERIALS SCIENCE
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2020
·Vol. 43
·期 1
·1-6
·
IF 1.392
Li Lili,Yang Lin,Fu Bowen,Li Zhiqiang
Herein, we demonstrate a hot-injection method towards the fabrication of \(\hbox {Sb}_{2}\hbox {S}_{3}\) . The evolution from amorphous \(\hbox {Sb}_{2}\hbox {S}_{3}\) nanoparticles to a sheaf of \(\hbox {Sb}_{2}\hbox {S}_{3}\) nanorods cross-linked together occurring with the increase of reaction temperature and time is studied. The structural, compositional and morphological features of \(\hbox {Sb}_{2}\hbox {S}_{3}\) products indicate the formation of crystalline \(\hbox {Sb}_{2}\hbox {S}_{3}\) with orthorhombic phase and high purity. As the reaction proceeds, it can be observed that the individual nanorod grows along the elongated direction ( c -axis), and it is noteworthy that its round cross-section could develop into the rectangular cross-section subsequently. In this study we also propose a possible formation mechanism for the growth process of \(\hbox {Sb}_{2}\hbox {S}_{3}\) , and it reveals that the present hot-injection could provide an ideal growth environment for synthesizing the nanostructured materials by optimizing the experimental parameters.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Shuli Yin,Ziqiang Wang,Hugang Zhang,Chunjie Li,Hongjie Yu,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
The development of effective and stable catalysts for hydrogen evolution reaction (HER) is desired for hydrogen production . Herein, we report a facile solvothermal approach to fabricate P-doped triangular PtPdCu nanodarts (PtPdCu-P NDs) using trioctylphosphine as phosphorus dopant. The PtPdCu-P NDs with separated branches can provide high surface areas and sufficient active sites for HER. Moreover, the incorporation of phosphorus into alloys can tailor the electronic structure and the d -band electron density of metals, which is beneficial for adsorption of hydrogen intermediates. Additionally, the phosphorus doping can effectively inhibit the metal dissolution during the electrolysis. Therefore, the PtPdCu-P NDs achieve a very low overpotential of 12 mV at current density of 10 mA cm −2 , rapid kinetics (Tafel slope: 29 mV dec -1 ) in 0.5 M H 2 SO 4 , superior to the undoped PtPdCu NDs. Moreover, the PtPdCu-P NDs also exhibit excellent stability, without obvious structure change and activity degradation after 10,000 cycles and 50-h electrolysis. This P-doping strategy is a universal approach to incorporate phosphorus into various nanomaterials without the change of the overall morphology, which holds a high potential in the water electrolysis.
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