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ACS Nano

Yanran Liu, Zhibin Gao, Yang Tan, Feng Chen
Point defects in 2D materials block in-plane charge transport, which incurs negative effects on the photoresponse of 2D monolayer materials. In contrast to in-plane charge transport, we show that out-of-plane charge transport in 2D materials can be enhanced through controllable formation of point defects, thus enhancing the photoresponse of a vertical heterostructure. Graphene and WSe2 monolayers were stacked together to construct a vertical heterostructure (W/G). Se point defects were artificially formed on the top atomic layer of WSe2 with controllable density via Ga ion irradiation...
September 21, 2018: ACS Nano
Daniel M Kroupa, Gregory F Pach, Márton Vörös, Federico Giberti, Boris D Chernomordik, Ryan W Crisp, Arthur J Nozik, Justin C Johnson, Rohan Singh, Victor I Klimov, Giulia Galli, Matthew C Beard
Generating multiple excitons by a single high-energy photon is a promising third-generation solar energy conversion strategy. We demonstrate that multiple exciton generation (MEG) in PbS|CdS Janus-like heteronanostructures is enhanced over that of single-component and core/shell nanocrystal architectures, with an onset close to two times the PbS band gap. We attribute the enhanced MEG to the asymmetric nature of the heteronanostructure that results in an increase in the effective Coulomb interaction that drives MEG and a reduction of the competing hot exciton cooling rate...
September 21, 2018: ACS Nano
Ming Xu, Mahmoud G Soliman, Xing Sun, Beatriz Pelaz, Neus Feliu, Wolfgang J Parak, Sijin Liu
The physicochemical properties of a set of 21 different gold nanoparticles (spherical and rod-shaped nanoparticles (NPs) of different diameters with three different surface coatings) were studied. Protein corona formation, in vitro uptake, effect on cell viability and proliferation, and in vivo biodistribution of these NPs were determined. The relation of the results of the different NPs was analyzed by hierarchical cluster analysis, which will tell which NPs have the most similar physicochemical properties and biological effects, without having to specify individual physicochemical parameters...
September 21, 2018: ACS Nano
David J Hill, Taylor S Teitsworth, Earl T Ritchie, Joanna M Atkin, James F Cahoon
Nanowires (NWs) with axial p- i- n junctions have been widely explored as microscopic diodes for optoelectronic and solar energy applications, and their performance is strongly influenced by charge recombination at the surface. We delineate how the photovoltaic performance of these diodes is dictated not simply by the surface, however, but also by the complex and seemingly counterintuitive interplay of diode geometry-i.e. radius ( R) and intrinsic length ( Li )-with the surface recombination velocity ( S). An analytical model to describe these relationships is developed and compared to finite-element simulations, which verify the accuracy and limitations of the model...
September 20, 2018: ACS Nano
Pieter Geiregat, Jorick Maes, Kai Chen, Emile Drijvers, Jonathan De Roo, Justin M Hodgkiss, Zeger Hens
Following the introduction of perovskites for photovoltaic solar energy conversion, the use of these materials as a general purpose opto-electronic material for displays, lighting and lasing has been explored. However, while reports on stimulated emission and lasing by perovskites show great promise, a comprehensive quantification of their optical gain characteristics is lacking. Here, we measure gain coefficients, clarify the gain mechanism, and explore the gain dynamics of colloidal cesium lead bromide nanocrystals by deploying a unique combination of broadband transient absorption and ultrafast fluorescence spectroscopy...
September 20, 2018: ACS Nano
Ming Xia, Pengwei Huang, Chen Sun, Ling Han, Frank S Vago, Kunpeng Li, Weiming Zhong, Wen Jiang, John S Klassen, Xi Jiang, Ming Tan
Homotypic interactions of viral capsid proteins are common, driving viral capsid self-formation. By taking advantage of such interactions of norovirus shell (S) domain that naturally builds the interior shells of norovirus capsids, we have developed a technology to produce 60-valent, icosahedral S60 nanoparticles through the E. coli system. This has been achieved by several modifications to the S domain, including an R69A mutation to destruct an exposed proteinase cleavage site and triple cysteine mutations (V57C/Q58C/S136C) to establish inter-S domain disulfide bonds for enhanced inter-S domain interactions...
September 20, 2018: ACS Nano
Sudipta Dubey, Simone Lisi, Goutham Nayak, Felix Herziger, Van-Dung Nguyen, Toai Le Quang, Vladimir Cherkez, César González, Yannick J Dappe, Kenji Watanabe, Takashi Taniguchi, Laurence Magaud, Pierre Mallet, Jean-Yves Veuillen, Raul Arenal, Laëtitia Marty, Julien Renard, Nedjma Bendiab, Johann Coraux, Vincent Bouchiat
No abstract text is available yet for this article.
September 20, 2018: ACS Nano
Chaoxi Wu, Xiaoying Wang, Bin Chu, Shunqing Tang, Yifei Wang
The development of self-assembly strategies for well-studied biopolymers is an important route to complex and functional nanostructures. Here we report the self-assembly of a stiff polysaccharide, formylated yeast β-glucan, into multiple highly ordered nanostructures from 1D to 3D. This polysaccharide could fold into a two-component helix that consisted of a rod-like helical core and flexible coronas. Annealing in formic acid can trigger the crosslinking of the coronas, resulting in the packing of helices into rod-like, sheet-like or tube-like supramolecular nanostructures...
September 20, 2018: ACS Nano
Dawei Wang, Xiaojing Wang, Zhiwei Li, Miaofang Chi, Yi Li, Yiding Liu, Yadong Yin
This study demonstrates that mineral redox buffer, an important concept in geology, can be used to manipulate the migration of nanoparticles and produce nanostructures of unexpected morphologies. Using a silica shell as a redox buffer, we show that iron oxide nanoparticles can be relocated from inside to the outer surface of the silica shell. The migration of iron oxide through silica was initiated by manipulation of the oxygen fugacity conditions at an elevated temperature. During the treatment, iron oxide was absorbed in then separated from the silica shell by the formation and then decomposition of iron silicate (Fe2SiO4)...
September 20, 2018: ACS Nano
Kenshiro Suenaga, Hyun Goo Ji, Yung-Chang Lin, Tom Vincent, Mina Maruyama, Adha Sukma Aji, Yoshihiro Shiratsuchi, Dong Ding, Kenji Kawahara, Susumu Okada, Vishal Panchal, Olga Kazakova, Hiroki Hibino, Kazu Suenaga, Hiroki Ago
Aligned growth of transition metal dichalcogenides (TMDCs) and related two-dimensional (2D) materials is essential for the synthesis of high-quality 2D films due to effective stitching of merging grains. Here, we demonstrate that the controlled growth of highly aligned molybdenum disulfide (MoS2) on c-plane sapphire with two distinct orientations which are highly controlled by tuning sulfur concentration. We found that the size of the aligned MoS2 grains is smaller and their photoluminescence (PL) is weaker as compared with those of the randomly oriented grains, signifying enhanced MoS2-substrate interaction in the aligned grains...
September 20, 2018: ACS Nano
Min Hong, Xiebo Zhou, Nan Gao, Shaolong Jiang, Chunyu Xie, Liyun Zhao, Yan Gao, Zhepeng Zhang, Pengfei Yang, Yuping Shi, Qing Zhang, Zhongfan Liu, Jijun Zhao, Yanfeng Zhang
Rhenium diselenide (ReSe2 ) is a unique transition-metal dichalcogenide (TMDC) possessing distorted 1T structure with a triclinic symmetry, strong in-plane anisotropy, and promising applications in optoelectronics and energy-related fields. So far, the structural and physical properties of ReSe2 are mainly uncovered by transmission electron microscopy and spectroscopy characterizations. Herein, by combining scanning tunneling microscopy and spectroscopy (STM and STS) with first-principles calculations, we accomplish the on-site atomic-scale identification of the top four non-identical Se atoms in a unit cell of the anisotropic monolayer ReSe2 on the Au substrate...
September 20, 2018: ACS Nano
Jiawei Sun, Huatian Hu, Di Zheng, Daxiao Zhang, Qian Deng, Shunping Zhang, Hongxing Xu
The interaction between plasmons in metal nanostructures and excitons in layered materials attracts recent interests due to its fascinating properties inherited from the two constituents, e.g., the high tunability on its spectral or spatial properties from the plasmonic component, and the large optical nonlinearity or light emitting properties from the excitonic counterpart. Here, we demonstrate light-emitting plexcitons from the coupling between the neutral excitons in monolayer WSe2 and highly confined nanocavity plasmons in the nanocube-over-mirror system...
September 20, 2018: ACS Nano
Amanda K A Silva, Silvana Perretta, Guillaume Perrod, Laetitia Pidial, Véronique Lindner, Florent Carn, Shony Lemieux, Damien Alloyeau, Imane Boucenna, Philippe Menasché, Bernard Dallemagne, Florence Gazeau, Claire Wilhelm, Christophe Cellier, Olivier Clément, Gabriel Rahmi
Extracellular vesicles (EVs) are increasingly envisioned to be the next-generation of biological proregenerative nanotherapeutic agents, as already demonstrated for heart, kidney, liver, lung injury, brain and skin regeneration. Herein, we explore another potential EV therapeutic application, for fistula healing, together with a local minimally-invasive delivery strategy. Allogenic extracellular vesicles (EVs) from adipose tissue-derived stromal cells (ADSCs) are administered in a porcine fistula model through a thermoresponsive pluronic F-127 (PF-127) gel, injected locally at 4°C and gelling at body temperature to retain EVs in the entire fistula tract...
September 19, 2018: ACS Nano
Jun Zhao, Zhilan Xiao, Tingting Li, Huiqin Chen, Ying Yuan, Alan Y Wang, Cheng-Hui Hsiao, Diana S-L Chow, Willem W Overwijk, Chun Li
Pancreatic ductal adenocarcinoma (PDAC) remains one of the most difficult cancers to treat. It is refractory to most existing therapies, including immunotherapies, due to the presence of an excessive desmoplastic stroma, which restricts penetration of drugs and cytotoxic CD8+ T cells. Stromal modulation has shown promising results in the enhancement of immune checkpoint blockade treatment in PDAC. We here demonstrate effective stromal modulation by a polymeric micelle-based nanoformulation to co-deliver a sonic hedgehog inhibitor (cyclopamine, abbreviated as CPA), and a cytotoxic chemotherapy drug (paclitaxel, abbreviated as PTX)...
September 19, 2018: ACS Nano
Daolin Wang, Changyong Gao, Wei Wang, Mengmeng Sun, Bin Guo, Hui Xie, Qiang He
The T-1000 liquid metal terminator, which can transform and self-repair, represents a dream for decades that robots can fundamentally change our daily life. To date, some large-scale liquid metal machines have been developed. However, there no report on nanoscaled liquid metal machines and their biomedical applications. We describe here a shape-transformable and fusible rod-like swimming liquid metal nanomachine, based on the biocompatible and transformable liquid metal gallium. These nanomachines were prepared by a pressure-filter-template technology, and the diameter and length could be controlled by adjusting the nanoporous templates, filter time and pressure...
September 19, 2018: ACS Nano
Tiago N Figueira, Diogo A Mendonça, Diana Gaspar, Manuel N Melo, Anne Moscona, Matteo Porotto, Miguel A R B Castanho, Ana Salomé Veiga
Measles remains one of the leading causes of child mortality worldwide and is re-emerging in some countries due to poor vaccine coverage, concomitant with importation of measles virus (MV) from endemic areas. The lack of specific chemotherapy contributes to negative outcomes, especially in infants or immunodeficient individuals. Fusion inhibitor peptides derived from the MV Fusion protein C-terminal Heptad Repeat (HRC) targeting MV envelope fusion glycoproteins block infection at the stage of entry into host cells, thus preventing viral multiplication...
September 19, 2018: ACS Nano
Hui Wang, Xiaodong Zhang, Yi Xie
Two-dimensional (2D) black phosphorus (BP) has drawn tremendous attention in solar-light-driven catalytic processes for its intriguing chemical and physical properties. Benefiting from the highly anisotropic electronic structure induced by its puckered crystal geometry, 2D BP tends to have greater confinement with respect to traditional inorganic nanomaterials, thereby leading to robust many-body effects. Such Coulomb-interaction-mediated effects dominate the electronic and optical properties of 2D BP-based nanosystems, where exotic correlations between photoinduced species give rise to unique photoexcitation processes that are closely associated with the involved photocatalytic behavior...
September 19, 2018: ACS Nano
Wenquan Ou, Jeong Hoon Byeon, Raj Kumar Thapa, Sae Kwang Ku, Chul Soon Yong, Jong Oh Kim
Because of their extraordinary physical properties and biocompatibility, black phosphorus (BP) nanosheets (NSs) have been intensively employed in chemo-phototherapies, such as plasmonic inorganic nanoparticles or graphene NSs, over the past few years. However, most biomedical studies using BP NSs are only concerned with the optical property of BP NSs to repeatedly demonstrate chemo-phototherapeutic efficacies, although BP NSs have different properties from inorganic nanoparticles or graphene NSs, such as corrugated crystal structure, hydrophilicity, and biodegradability...
September 19, 2018: ACS Nano
Xingyu Lin, Xiao Huang, Yanzhe Zhu, Katharina Urmann, Xing Xie, Michael R Hoffmann
In this work, we introduce an asymmetric membrane as a simple and robust nanofluidic platform for digital detection of single pathogenic bacteria directly in 10 mL of unprocessed environmental water samples. The asymmetric membrane, consisting of uniform micropores on one side and a high density of vertically aligned nanochannels on the other side, was prepared within 1 min by a facile method. The single membrane covers all the processing steps from sample concentration, purification, and partition to final digital loop-mediated isothermal amplification (LAMP)...
September 19, 2018: ACS Nano
Elias Nakouzi, Jennifer A Soltis, Benjamin A Legg, Gregory K Schenter, Xin Zhang, Trent R Graham, Kevin M Rosso, Lawrence M Anovitz, James J De Yoreo, Jaehun Chun
Although oriented aggregation of particles is a widely recognized mechanism of crystal growth, the impact of many fundamental parameters, such as crystallographically distinct interfacial structures, solution composition, and nanoparticle morphology, on the governing mechanisms and assembly kinetics are largely unexplored. Thus, the collective dynamics of systems exhibiting OA has not been predicted. In this context, we investigated the structure and dynamics of boehmite aggregation as a function of solution pH and ionic strength...
September 19, 2018: ACS Nano
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