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One pot synthesis of core shell nanoparticles

Shu Fen Tan, Geeta Bisht, Utkarsh Anand, Michel Bosman, Xin Ee Yong, Utkur Mirsaidov
One-pot wet-chemical synthesis is a simple way to obtain nanoparticles (NPs) with a well-defined shape and composition. However, achieving good control over NP synthesis would require a comprehensive understanding of the mechanisms of NP formation, something that is hard to achieve experimentally. Here, we study the formation of gold (Au) core - palladium (Pd) shell NPs under kinetically and thermodynamically controlled reaction conditions using in situ liquid cell transmission electron microscopy (TEM). By controlling the reaction temperature, we demonstrate that it is possible to tune the shape of Au nanorods (NR) to Au-Pd arrow-headed structures or to cuboidal core-shell NPs...
August 12, 2018: Journal of the American Chemical Society
Qixuan Zhong, Muhan Cao, Huicheng Hu, Di Yang, Min Chen, Pengli Li, Linzhong Wu, Qiao Zhang
The practical applications of CsPbX3 nanocrystals (NCs) have been limited by their poor stability. Although much effort has been devoted to making core-shell nanostructures to enhance the stability of CsPbX3 NCs, it is still very difficult to coat CsPbX3 NCs with another material on a single-particle level. In this work, we report a facile one-pot approach to synthesize CsPbBr3 @SiO2 core-shell nanoparticles (NPs), in which each core-shell NP has only one CsPbBr3 NC. The formation process has been carefully monitored...
July 17, 2018: ACS Nano
Alexander G R Howe, Peter J Miedziak, David J Morgan, Qian He, Peter Strasser, Jennifer K Edwards
A series of 1 wt% supported Au, Pd and AuPd nanoalloy catalysts were prepared via microwave assisted reduction of PdCl2 and HAuCl4 in a facile, one pot process. The resulting materials showed excellent activity for the direct synthesis of hydrogen peroxide from hydrogen and oxygen, with a synergistic effect observed on the addition of Au into a Pd catalyst. Detailed electron microscopy showed that the bimetallic particles exhibited a core-shell morphology, with an Au core surrounded by an Au-Pd shell, with a size between 10-20 nm...
May 25, 2018: Faraday Discussions
Julia Hesse, Dennis T Klier, Massimo Sgarzi, Anne Nsubuga, Christoph Bauer, Jörg Grenzer, René Hübner, Marcus Wislicenus, Tanmaya Joshi, Michael U Kumke, Holger Stephan
We report a simple one-pot method for the rapid preparation of sub-10 nm pure hexagonal (β-phase) NaYF4 -based upconverting nanoparticles (UCNPs). Using Therminol®  66 as a co-solvent, monodisperse UCNPs could be obtained in unusually short reaction times. By varying the reaction time and reaction temperature, it was possible to control precisely the particle size and crystalline phase of the UCNPs. The upconversion (UC) luminescence properties of the nanocrystals were tuned by varying the concentrations of the dopants (Nd3+ and Yb3+ sensitizer ions and Er3+ activator ions)...
February 2018: ChemistryOpen
Dong-Ning Li, Ya-Mei He, Jiu-Ju Feng, Qian-Li Zhang, Lu Zhang, Liang Wu, Ai-Jun Wang
Herein, prickly platinum-palladium core-shell nanocrystals (Pt@Pd NCs) were prepared by a facile one-pot aqueous method, only taking sodium pyrrolidone carboxylate (PCA-Na) as the structure director and stabilizing agent. The products were mainly characterized by microscopic analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), followed by discussing the formation mechanism in details. The electrochemical characterizations were examined by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA)...
April 15, 2018: Journal of Colloid and Interface Science
Jingwen Feng, Jia Liu, Xiaoyan Cheng, Jiajia Liu, Meng Xu, Jiatao Zhang
Yolk-shell hybrid nanoparticles with noble metal core and programmed semiconductor shell composition may exhibit synergistic effects and tunable catalytic properties. In this work, the hydrothermal cation exchange synthesis of Au@ZnS-AgAuS yolk-shell nanocrystals (Y-S NCs) with well-fabricated void size, grain-boundary-architectured ZnS-AgAuS shell and in situ generated Au cocatalyst are demonstrated. Starting from the novel cavity-free Au@AgAuS core-shell NCs, via aqueous cation exchange reaction with Zn2+ , the gradual evolution with produced Au@ZnS-AgAuS Y-S NCs can be achieved successfully...
January 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Wendong Ke, Wei Yin, Zengshi Zha, Jean Felix Mukerabigwi, Weijian Chen, Yuheng Wang, Chuanxin He, Zhishen Ge
Block copolymer prodrugs (BCPs) have attracted considerable attentions in clinical translation of nanomedicine owing to their self-assembly into well-defined core-shell nanoparticles for improved pharmacokinetics, stability in blood circulation without drug leakage, and optimized biodistribution. However, a cascade of physiological barriers against specific delivery of drugs into tumor cells limit the final therapeutic efficacy. Herein, we report a robust and facile strategy based on thiolactone chemistry to fabricate well-defined BCPs with sequential tumor pH-promoted cellular internalization and intracellular stimuli-responsive drug release...
February 2018: Biomaterials
Qi Wang, Zhiliang Zhao, Yanlin Jia, Mingpu Wang, Weihong Qi, Yong Pang, Jiang Yi, Yufang Zhang, Zhou Li, Zhuo Zhang
Although tremendous efforts have been devoted to the exploration of cost-effective, active, and stable electrochemical catalysts, only few significant breakthroughs have been achieved up to now. Therefore, exploring new catalysts and improving catalyst activity and stability are still major tasks at present. Controllable synthesis of Pt-based alloy nanocrystals with a uniform high-index surface and unique architecture has been regarded as an effective strategy to optimize their catalytic efficiency toward electrochemical reactions...
October 25, 2017: ACS Applied Materials & Interfaces
Sarah Schmidt, Isabella Tavernaro, Christian Cavelius, Eva Weber, Alexander Kümper, Carmen Schmitz, Jana Fleddermann, Annette Kraegeloh
In this study, a novel approach for preparation of green fluorescent protein (GFP)-doped silica nanoparticles with a narrow size distribution is presented. GFP was chosen as a model protein due to its autofluorescence. Protein-doped nanoparticles have a high application potential in the field of intracellular protein delivery. In addition, fluorescently labelled particles can be used for bioimaging. The size of these protein-doped nanoparticles was adjusted from 15 to 35 nm using a multistep synthesis process, comprising the particle core synthesis followed by shell regrowth steps...
September 25, 2017: Nanoscale Research Letters
Diego Bouzas-Ramos, Marta García-Cortes, Alfredo Sanz-Medel, Jorge Ruiz Encinar, José M Costa-Fernández
Coupling of asymmetric flow field-flow fractionation (AF4) to an on-line elemental detection (inductively coupled plasma-mass spectrometry, ICP-MS) has been recently proposed as a powerful diagnostic tool for characterization of the bioconjugation of CdSe/ZnS core-shell Quantum Dots (QDs) to antibodies. Such approach has been used herein to demonstrate that cap exchange of the native hydrophobic shell of core/shell QDs with the bidentate dihydrolipoic acid ligands directly removes completely the eventual side nanoparticulated populations generated during simple one-pot synthesis, which can ruin the subsequent final bioapplication...
October 13, 2017: Journal of Chromatography. A
Hang Sun, Qinrong He, Ping She, Shan Zeng, Kongliang Xu, Jiayi Li, Song Liang, Zhenning Liu
Natural biological systems often use hollow structures to decrease reflection and achieve high solar light utilization. Herein, bio-inspired Au@TiO2 yolk-shell nanoparticles (NPs) have been designed to combine the advantages of noble metal coupling and hollow structures, and subsequently synthesized via a facile one-pot hydrothermal approach. The Au@TiO2 yolk-shell NPs not only exhibit reduced reflectance by multiple reflections and scattering within the hollow NPs, but also show enhanced photocatalytic activity in Rhodamine B (RhB) degradation by simultaneously improving light harvesting, charge separation and reaction site accessibility...
November 1, 2017: Journal of Colloid and Interface Science
Chandrani Nayak, D Bhattacharyya, K Bhattacharyya, A K Tripathi, R D Bapat, S N Jha, N K Sahoo
Au-Pt bimetallic nanoparticles have been synthesized through a one-pot synthesis route from their respective chloride precursors using block copolymer as a stabilizer. Growth of the nanoparticles has been studied by simultaneous in situ measurement of X-ray absorption spectroscopy (XAS) and UV-Vis spectroscopy at the energy-dispersive EXAFS beamline (BL-08) at Indus-2 SRS at RRCAT, Indore, India. In situ XAS spectra, comprising both X-ray near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) parts, have been measured simultaneously at the Au and Pt L3-edges...
July 1, 2017: Journal of Synchrotron Radiation
Changqing Dai, Yang Yang, Zheng Zhao, Adrian Fisher, Zhiping Liu, Daojian Cheng
Core-shell segregated bimetallic nanoparticles (NPs) exhibit increased enhanced catalytic performance compared to that of mixed bimetallic NPs. Here, we report a simple, yet efficient, one-pot synthetic strategy to synthesize uniform three-layer core/shell PtCu NPs by adding benzyl ether (BE) in the synthesis process of mixed PtCu NPs. In comparison with commercial Pt/C and also mixed PtCu NPs, the three-layer core/shell PtCu NPs exhibit superior activity in catalyzing the oxygen reduction reaction (ORR), formic acid oxidation reaction (FAOR), methanol oxidation reaction (MOR), and ethanol oxidation reaction (EOR), mainly due to the ligand (BE)-induced surface segregation of Pt on the surface of the NPs...
July 6, 2017: Nanoscale
Hyunje Woo, Eunji Kim, Jun-Hyuk Kim, Su-Won Yun, Ji Chan Park, Yong-Tae Kim, Kang Hyun Park
Here, we report the effect of Fe(CO)5 additives in the synthesis of branched Pt-CoO nanowires (NWs) and core@shell concave nanocubes (NCs), in a one-pot system. Key to the success of this synthesis is control over the shape of the Pt seeds by controlling the quantity of Fe(CO)5 additive. In the absence of Fe(CO)5, branched Pt-CoO NWs were synthesized through the attachment of small Pt seed particles, followed by the growth of CoO by deposition. On the other hand, Pt@CoO concave NCs were obtained in the presence of Fe(CO)5 because of the stronger adsorption of Co on the Pt (100) surfaces than on the closely packed (111) surfaces...
June 20, 2017: Scientific Reports
Ali Maleki, Morteza Aghaei
A sonochemical approach for the one-pot three-component synthesis of pyridoimidazoisoquinolines via by using phthalaldehyde, trimethylsilylcyanide and aminopyridines the presence of a catalytic amount of a new nanomagnetic catalyst Fe3 O4 @SiO2 -CO-C6 H4 -NH2 is described. The characterization of the nanocatalyst and the product was done by various methods, such as FT-IR, SEM, EDX, TGA/DTA, NMR, MS and CHN analyses. This is the first design, preparation, characterization and application of the present core/shell nanomaterial and also the first ultrasound irradiated synthesis of the biologically and pharmaceutically important fused polycyclic compounds in ethanol as a green solvent...
September 2017: Ultrasonics Sonochemistry
Lili Qu, Huicheng Hu, Jiaqi Yu, Xiaoya Yu, Jian Liu, Yong Xu, Qiao Zhang
Recently, Janus nanostructures that possess two or more different surface functions have attracted enormous attention because of their unique structures and promising applications in diverse fields. In this work, we present that Janus structured dendritic mesoporous silica@resorcinol-formaldehyde (DMS@RF) nanoparticles can be prepared through a simple one-pot colloidal method. The Janus DMS@RF nanoparticle shows a bonsai-like morphology which consists of a dendritic mesoporous silica part and a spherical RF part...
May 30, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jian-Feng Ma, Jian-Xiong Xing, Kun Wang, Hai-Yan Yang, Ben-Hua Fei, Xing-E Liu
The core-shell structure of carbon encapsulated magnetic nanoparticles (CEMNs) displays unique properties. Enhancing the magnetization of iron core, in parallel, improving the encapsulation of carbon shell are the two major challenges in the synthesis of CEMNs. Inspired by efficient cellulose-dissolving system, carbon encapsulated magnetic nano-Fe3 O4 particles (Fe3 O4 @C) with ∼10.0nm Fe3 O4 cores and 1.9-3.3nm carbon shell, were successfully one-pot synthesized via a novel hydrothermal carbonization (HTC) process...
May 15, 2017: Carbohydrate Polymers
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
June 15, 2017: Journal of Colloid and Interface Science
Yasutaka Kuwahara, Takahiro Ando, Hiroto Kango, Hiromi Yamashita
One-pot reaction involving Pd-catalyzed H2 O2 production from H2 and O2 and Ti-catalyzed successive oxidation with H2 O2 in a single reaction vessel is an alluring strategy for the synthesis of targeted chemicals in terms of sustainability and economic competitiveness. In this study, a yolk-shell nanostructured catalyst, consisting of Pd nanoparticles (NPs) with core diameter ca. 4.0 nm and a porous titanosilicate shell of ca. 15 nm thickness, was fabricated by using an oil-in-water (O/W) microemulsion-based interfacial self-assembly approach...
January 5, 2017: Chemistry: a European Journal
Angshuman Ray Chowdhuri, Dipranjan Laha, Srimanta Pal, Parimal Karmakar, Sumanta Kumar Sahu
In this work, a new theranostic nanoplatform is developed to construct an anticancer drug carrier by integrating the distinct advantages of upconversion nanoparticles (UCNPs) and metal organic frameworks (MOFs) encapsulated with a targeting ligand. Here NaYF4 :Yb3+ ,Er3+ is chosen as an upconversion nanoparticle for its high luminescence properties. Then, folic acid encapsulated Zeolitic Imidazolate Framework-8 (ZIF-8) is directly coated on UCNPs in one step to form a monodispersed core-shell structured nanocomposite (labeled as UCNPs@ZIF-8/FA)...
November 15, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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