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ACS Nano

Jennifer M MacLeod, Josh Lipton-Duffin, Chaoying Fu, Tyler Taerum, Dmitrii F Perepichka, Federico Rosei
Two-dimensional (2D) molecular self-assembly allows for the formation of well-defined supramolecular layers with tailored geometrical, compositional, and chemical properties. To date, random intermixing and entropic effects in these systems have largely been associated with crystalline disorder and glassy phases. Here we describe a 2D crystalline self-assembled molecular system that exhibits random incorporation of substitutional molecules. The lattice is formed from a mixture of trimesic acid (TMA) and terthienobenzenetricarboxylic acid (TTBTA), C3-symmetric hydrogen-bonding units of very different sizes (0...
August 21, 2017: ACS Nano
Finn Purcell-Milton, Anastasia K Visheratina, Vera A Kuznetsova, Aisling Ryan, Anna O Orlova, Yurii K Gun'ko
Core/Shell quantum dots (QDs) are of high scientific and technological importance as these nanomaterials have found a number of valuable applications. In this paper, we have investigated the dependence of optical activity and photoluminescence upon CdS shell thickness in a range of core-shell structured CdSe/CdS QDs capped with chiral ligands. For our study, five samples of CdSe/CdS were synthesised utilizing successive ion layer adsorption and reaction (SILAR) to vary the thickness of the CdS shell from 0...
August 18, 2017: ACS Nano
Won-Tae Koo, Shaopeng Qiao, Alana F Ogata, Gaurav Jha, Ji-Soo Jang, Vivian T Chen, Il-Doo Kim, Reginald M Penner
The oxygen, O2, in air interferes with the detection of H2 by palladium (Pd)-based H2 sensors, including Pd nanowires (NWs), depressing the sensitivity and retarding the response/recovery speed in air - relative to N2 or Ar. Here, we describe the preparation of H2 sensors in which a nanofiltration layer consisting of a Zn metal-organic-framework (MOF) is assembled onto Pd NWs. Polyhedron particles of Zn based zeolite imidazole framework (ZIF-8) were synthesized on lithographically patterned Pd NWs, leading to the creation of ZIF-8/Pd NWs bi-layered H2 sensors...
August 18, 2017: ACS Nano
Teresa Fotticchia, Raffaele Vecchione, Pasqualina Liana Scognamiglio, Daniela Guarnieri, Vincenzo Calcagno, Concetta Di Natale, Chiara Attanasio, Maria De Gregorio, Chiara Di Cicco, Vincenzo Quagliariello, Nicola Maurea, Antonio Barbieri, Luca Raiola, Rosario Vincenzo Iaffaioli, Paolo Antonio Netti
The key role of nanocarriers in improving the pharmacological properties of commonly used drugs is recognized worldwide. It is also known that in the development of new effective nanocarriers the use of targeting moieties integrated on their surface is essential. Herein, we propose a nanocarrier based on an oil in water nanoemulsion coated with a membranotropic peptide derived from the glycoprotein H of Herpes simplex virus 1, known as gH625, in order to reduce endo-lysosomal accumulation and to enhance cytosolic localization...
August 18, 2017: ACS Nano
Xu Xue, Ziyao Zhou, Guohua Dong, Mengmeng Feng, Yijun Zhang, Shishun Zhao, Zhongqiang Hu, Wei Ren, Zuo-Guang Ye, Yaohua Liu, Ming Liu
Electric field control of dynamic spin interactions is promising to break through the limitation of the magnetostatic interaction based magnetoelectric (ME) effect. In this work, electric field control of the two-magnon scattering (TMS) effect excited by in-plane lattice rotation has been demonstrated in a La0.7Sr0.3MnO3 (LSMO)/Pb(Mn2/3Nb1/3)-PbTiO3 (PMN-PT) (011) multiferroic heterostructure. Compared with the conventional strain-mediated ME effect, a giant enhancement of ME effect up to 950% at the TMS critical angle is precisely determined by angular resolution of the ferromagnetic resonance (FMR) measurement...
August 18, 2017: ACS Nano
Thomas Schmaltz, Bastian Gothe, Andreas Krause, Susanne Leitherer, Hans-Georg Steinrück, Michael Thoss, Timothy Clark, Marcus Halik
Self-assembled monolayer field-effect transistors (SAMFETs) are not only a promising type of organic electronic device but also allow detailed analyses of structure-property correlations. The influence of the morphology on the charge transport is particularly pronounced, due to the confined monolayer of 2D-π-stacked organic semiconductor molecules. The morphology, in turn, is governed by relatively weak van-der-Waals interactions and is thus prone to dynamic structural fluctuations. Accordingly, combining electronic and physical characterization and time-averaged X-ray analyses with the dynamic information available at atomic resolution from simulations allows us to characterize self-assembled monolayer (SAM) based devices in great detail...
August 18, 2017: ACS Nano
Yan Huang, Wing Shan Ip, Yuen Ying Lau, Jinfeng Sun, Jie Zeng, Nga Sze Sea Yeung, Wing Sum Ng, Hongfei Li, Zengxia Pei, Qi Xue, Yukun Wang, Jie Yu, Hong Hu, Chunyi Zhi
With intrinsic safety and much higher energy densities than supercapacitors, rechargeable nickel/cobalt-zinc-based textile batteries are promising power sources for next generation personalized wearable electronics. However, high-performance wearable nickel/cobalt-zinc-based batteries are rarely reported because there is a lack of industrially weavable and knittable highly conductive yarns. Here, we use scalably produced highly conductive yarns uniformly covered with zinc (as anode) and nickel cobalt hydroxide nanosheets (as cathode) to fabricate rechargeable yarn batteries...
August 18, 2017: ACS Nano
Bing Fu, Benjamin P Isaacoff, Julie S Biteen
Plasmonic nanoparticles (NPs) enhance the radiative decay rate of adjacent dyes and can significantly increase fluorescence intensity for improved spectroscopy. However, the NP nanoantenna complicates super-resolution imaging by introducing a mislocalization between the emitter position and its super-resolved emission position. The mislocalization magnitude depends strongly on the dye/NP coupling geometry. It is therefore crucial to quantify mislocalization to recover the actual emitter position in a coupled system...
August 18, 2017: ACS Nano
Aftab Ahmed, Matthew Pelton, Jeffrey R Guest
Measurements of acoustic vibrations in nanoparticles provide a unique opportunity to study mechanical phenomena at nanometer length scales and picosecond time scales. Vibrations in noble-metal nanoparticles have attracted particular attention, because they couple to plasmon resonances in the nanoparticles, leading to strong modulation of optical absorption and scattering. There are three mechanisms that transduce the mechanical oscillations into changes in the plasmon resonance: (1) changes in the nanoparticle geometry, (2) changes in electron density due to changes in the nanoparticle volume, and (3) changes in the interband transition energies due to compression / expansion of the nanoparticle (deformation potential)...
August 17, 2017: ACS Nano
Lee A Solomon, Matthew E Sykes, Yimin A Wu, Richard D Schaller, Gary P Wiederrecht, Harry Christopher Fry
Light-harvesting biomaterials are an attractive target in photovoltaics, photocatalysis, and artificial photosynthesis. Through peptide self-assembly, complex nanostructures can be engineered to study the role of chromophore organization during light absorption and energy transport. To this end, we demonstrate the one-dimensional transport of excitons along naturally occurring, light-harvesting, Zn-protoporphyrin IX chromophores within self-assembled peptide-amphiphile nanofibers. The internal structure of the nanofibers induces packing of the porphyrins into linear chains...
August 17, 2017: ACS Nano
Rafal Zuzak, Ruth Dorel, Mariusz Krawiec, Bartosz Such, Marek Kolmer, Marek Szymonski, Antonio M Echavarren, Szymon Godlewski
The on-surface synthesis of nonacene has been accomplished by dehydrogenation of an air-stable partially saturated precursor, which could be aromatized by using a combined scanning tunneling and atomic force microscope (STM/AFM) as well as by on-surface annealing. This transformation allowed the in-detail analysis of the electronic properties of nonacene molecules physisorbed on Au(111) by scanning tunneling spectroscopy (STS) measurements. The spatial mapping of molecular orbitals was corroborated by density functional theory (DFT) calculations...
August 17, 2017: ACS Nano
Ming Chen, Juan Xia, Jiadong Zhou, Qingsheng Zeng, Kaiwei Li, Kazunori Fujisawa, Wei Fu, Ting Zhang, Jing Zhang, Zhe Wang, Zhixun Wang, Xiaoting Jia, Mauricio Terrones, Ze Xiang Shen, Zheng Liu, Lei Wei
Thermoplastic polymers subjected to a continuous tensile stress experience a state of mechanical instabilities, resulting in neck formation and propagation. The necking process with strong localized strain enables the transformation of initially brittle polymeric materials into robust, flexible, and oriented forms. Here we harness the polymer-based mechanical instabilities to control the fragmentation of atomically thin transition metal dichalcogenides (TMDs). We develop a simple and versatile nanofabrication tool to precisely fragment atom-thin TMDs sandwiched between thermoplastic polymers into ordered and atomically perfect TMD nanoribbons in arbitrary directions regardless of the crystal structures, defect content, and original geometries...
August 17, 2017: ACS Nano
Xiong Zhou, Fabian Bebensee, Mingmei Yang, Regine Bebensee, Fang Cheng, Yang He, Qian Shen, Jian Shang, Zhirong Liu, Flemming Besenbacher, Trolle R Linderoth, Kai Wu
To discern the catalytic activity of different active sites, a self-assembly strategy is applied to confine the involved species that are "attached" to specific surface sites. The employed probe reaction system is the Ullmann coupling of 4-bromobiphenyl, C6H5C6H4Br, on an atomically flat Ag(111) surface, which is explored by combined scanning tunneling microscopy, synchrotron X-ray photoelectron spectroscopy, and density functional theory calculations. The catalytic cycle involves the detachment of the Br atom from the initial reactant to form an organometallic intermediate, C6H5C6H4AgC6H4C6H5, which subsequently self-assembles with its central Ag atom residing either on 2-fold bridge or 3-fold hollow sites at full coverage...
August 17, 2017: ACS Nano
Daniele Maiolo, Claudia Pigliacelli, Paola Sánchez Moreno, Martina Bruna Violatto, Laura Talamini, Ilaria Tirotta, Rosanna Piccirillo, Massimo Zucchetti, Lavinia Morosi, Roberta Frapolli, Gabriele Candiani, Paolo Bigini, Pierangelo Metrangolo, Francesca Baldelli Bombelli
One of the main hurdles in nanomedicine is the low stability of drug-nanocarrier complexes as well as the drug delivery efficiency in the region-of-interest. Here, we describe the use of the film-forming protein hydrophobin HFBII to organize dodecanethiol-protected gold nanoparticles (NPs) into well-defined supraparticles (SPs). The obtained SPs are exceptionally stable in vivo and efficiently encapsulate hydrophobic drug molecules. The HFBII film prevents massive release of the encapsulated drug, which, instead, is activated by selective SP disassembly triggered intracellularly by glutathione reduction of the protein film...
August 17, 2017: ACS Nano
Dengfeng Hu, Huan Li, Bailiang Wang, Zi Ye, Wenxi Lei, Fan Jia, Qiao Jin, Ke-Feng Ren, Jian Ji
Biofilms that contribute to the persistent bacterial infections pose serious threats to global public health, mainly due to their resistance to antibiotics penetration and escaping innate immune attacks by phagocytes. Here, we report a kind of surface-adaptive gold nanoparticles (AuNPs) exhibiting (1) a self-adaptive target to the acidic microenvironment of biofilm, (2) an enhanced photothermal ablation of methicillin-resistant Staphylococcus aureus (MRSA) biofilm under near-infrared (NIR) light irradiation, and (3) no damage to the healthy tissues around the biofilm...
August 17, 2017: ACS Nano
Fei-Hu Du, Yizhou Ni, Ye Wang, Dong Wang, Qi Ge, Shuo Chen, Hui Ying Yang
Designing yolk-shell nanostructures is an effective way of addressing the huge volume expansion issue for large-capacity anode and cathode materials in Li-ion batteries (LIBs). Previous studies mainly focused on adopting a SiO2 template through HF etching to create yolk-shell nanostructures. However, HF etching is highly corrosive and may result in a significant reduction of Si content in the composite. Herein, a silkworm cocoon-like silicon-based composite is prepared through a green approach in which Al2O3 was selected as a sacrificial template...
August 17, 2017: ACS Nano
Emil Sierda, Mikel Abadia, Jens Brede, Micha Elsebach, Bernhard Bugenhagen, Marc Heinrich Prosenc, Maciej Bazarnik, Roland Wiesendanger
Molecular spintronics is currently attracting a lot of attention due to its great advantages over traditional electronics. A variety of self-assembled molecule-based devices are under development, but studies regarding the reliability of the growth-process remain rare. Here, we present a method to control the length of molecular spintronic chains and to make their terminations chemically inert, thereby suppressing uncontrolled coupling to surface defects. The temperature evolution of chain formation was followed by X-ray photoelectron spectroscopy, to determine optimal growth conditions...
August 16, 2017: ACS Nano
Shuoxing Jiang, Fan Hong, Huiyu Hu, Hao Yan, Yan Liu
Although many models have been developed to guide the design and implementation of DNA tile-based self-assembly systems with increasing complexity, the fundamental assumptions of the models have not been thoroughly tested. To expand the quantitative understanding of DNA tile-based self-assembly and to test the fundamental assumptions of self-assembly models, we investigated DNA tile attachment to preformed "multi-tile" arrays in real time, and obtained the thermodynamic and kinetic parameters of single tile attachment in various sticky end association scenarios...
August 16, 2017: ACS Nano
Xijun Xu, Jun Liu, Zhengbo Liu, Jiadong Shen, Renzong Hu, Jiangwen Liu, Liuzhang Ouyang, Lei Zhang, Min Zhu
To solve the serious problems (the agglomeration of nano-Fe0, dissolution of polysulfide and low electronic conductivity of Li2S) of earth-abundant pyrite (FeS2) cathode for lithium batteries, a simple in-situ encapsulation and transformation route has been successfully developed to synthesis pitaya-structured porous carbon embedded with FeS2 nanoparticles. Due to such hierarchical architecture design, this cathode of pitaya-structured FeS2@C can effectively avoid the serious agglomeration and coarsening of small Fe nanoparticles, reduce the dissolution of polysulfide and provide superior kinetics toward lithium storage, resulting in enhanced reversibility and rate capability...
August 16, 2017: ACS Nano
Dong Wang, Ken Nakajima, Feng Liu, Shaowei Shi, Thomas P Russell
The large Young's modulus difference between chemically modified fullerene (PCBM) and a conjugated polymer was used to nanomechanically map the diffusion of PCBM into PTB7, a high efficiency low band gap conjugated polymer. The sharp tip in nanomechanical atomic force microscopy (AFM) ensures a high-resolution nanomechanical characterization of the diffusion front, with the intrinsic benefits of revealing the mechanical properties of the mixtures. Localized structure changes induced by diffusion were investigated by grazing incidence x-ray diffraction methods...
August 16, 2017: ACS Nano
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