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Nanoscale

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https://www.readbyqxmd.com/read/30411778/surface-conversion-of-zno-nanorods-to-zif-8-to-suppress-surface-defects-for-a-visible-blind-uv-photodetector
#1
Hyeonghun Kim, Woochul Kim, Jiyoon Park, Namsoo Lim, Ryeri Lee, Sung Jun Cho, Yogeenth Kumaresan, Myoung-Kyu Oh, Gun Young Jung
ZnO nanomaterials are promising building blocks for an efficient UV photodetector; however, their slow sensing behavior and undesired response to visible light, which are attributed to surface defects, such as oxygen or zinc vacancies, are challenges that remain to be addressed. Here, we transformed the ZnO nanorod surface into a zeolitic imidazolate framework-8 (ZIF-8) to eliminate ZnO surface defects. Vertical-type photodetectors were fabricated incorporating a Schottky junction at the ZIF-8/gold (Au) top electrode and could respond to UV light with a rapid response and recovery (1-2 s) and demonstrated a UV-to-visible rejection ratio in the order of 103, qualifying them as efficient visible-blind UV photodetectors...
November 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/30411765/correction-metal-enhanced-fluorescence-biosensing-from-ultra-violet-towards-second-near-infrared-window
#2
Sarah Madeline Fothergill, Caoimhe Joyce, Fang Xie
Correction for 'Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window' by Sarah Madeline Fothergill et al., Nanoscale, 2018, DOI: 10.1039/c8nr06156d.
November 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/30411107/n-doped-porous-carbon-nanosheets-decorated-with-graphitized-carbon-layer-encapsulated-co-9-s-8-nanoparticles-an-efficient-bifunctional-electrocatalyst-for-the-oer-and-orr
#3
Linghui Li, Li Song, Hu Guo, Wei Xia, Cheng Jiang, Bin Gao, Chao Wu, Tao Wang, Jianping He
Electrocatalysts with highly effective activity for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are considered to be the key factor of renewable energy technologies. Herein, we designed and synthesized bi-functional electrocatalyst Co9S8/C nanosheets (NSs) by reducing the Co3O4/C NS precursor with sodium sulfide. From the structural characterization, Co9S8 is anchored on the graphitized carbon NSs homogeneously. According to the electrochemical measurements, the Co9S8/C NSs show excellent electrocatalytic activity towards both the ORR (Eonset = 0...
November 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/30411102/a-general-approach-for-encapsulating-organic-crystals-in-a-polyaniline-shell
#4
Miao Yan, Neng Wang, Bingju Zhong, Xuejun Cheng, Hong Wang, Hongyu Chen
The hydrophobicity and instability of organic crystals restrict their further applications. Here, we present a general and scalable method to encapsulate different organic crystals in a conductive polyaniline (PANI) shell. The shell significantly improves the stability and dispersity of the nanocrystals, without compromising their luminescence intensity.
November 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/30407474/interface-engineered-surface-morphology-evolution-of-au-pd-core-shell-nanorods
#5
Yanchao Xu, Xiaoqiang Cui, Kun Qi, Shuting Wei, Qiyu Wang, Weitao Zheng
Engineering the interfacial structure of bimetallic nanocrystals is an effective method to improve their electrocatalytic performances. Here, we design a facile strategy for controlling the surface morphology evolution of Au@Pd core-shell nanorods by adjusting the solution supersaturation. The Pd shell of the as-prepared Au@Pd bimetallic nanorods can be modulated from a (111) facet-exposed island to a (100) facet-exposed conformal shell. The conformal shell structure exhibited enhanced catalytic performance toward the ethanol oxidation reaction, while the core-island structure possessed better catalytic stability...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30407473/assessment-of-the-targeting-specificity-of-a-fluorescent-albumin-conceived-as-a-preclinical-agent-of-the-liver-function
#6
K Lemdani, H Salmon, R Gahoual, M Bessodes, D Scherman, P Houzé, J Seguin, N Mignet
In the context of increasing liver diseases, no contrast agent is currently available in Europe and the United States to directly assess the liver function. Only neolactosylated human serum albumin is being clinically used in Asia. In order to perform preclinical studies in the context of liver diseases, we conceived a fluorescent lactosylated albumin for the quantification of liver functional cells (l-Cyal). Precise characterization was achieved in order to determine the amounts of lactose and Cyanine 5 (Cy5) coupled to the albumin...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406799/highly-conductive-porous-graphene-sulfur-composite-ribbon-electrodes-for-flexible-lithium-sulfur-batteries
#7
Woon Gie Chong, Youhua Xiao, Jian-Qiu Huang, Shanshan Yao, Jiang Cui, Lei Qin, Chao Gao, Jang-Kyo Kim
Flexible batteries have become an indispensable component of emerging devices, such as wearable, foldable electronics and sensors. Although various flexible batteries have been explored based on one-dimensional and two-dimensional platforms, developing a high energy density electrode with high structural integrity remains challenging. Herein, a scalable, one-pot wet spinning strategy is used to synthesize a flexible porous cathode for lithium-sulfur batteries (LSBs) for the first time, which consists of reduced graphene oxide (rGO), graphene crumples (GCs) and sulfur powders...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406795/using-light-x-rays-and-electrons-for-evaluation-of-the-nanostructure-of-layered-materials
#8
John Djamil, Anna-Lena Hansen, Claudia Backes, Wolfgang Bensch, Ulrich Schürmann, Lorenz Kienle, Andre Düvel, Paul Heitjans
As a case study for the evaluation of the nanostructure of layered materials, we report on results of the comprehensive characterization of high-energy ball-milled layered molybdenum disulfide (2H-MoS2) on different length scales. Analysis of X-ray powder diffraction patterns (XRPDs) including the Debye background at low scattering angles caused by uncorrelated single or few-layer MoS2 slabs (full scattering model), yield much more precise data about the average stacking degree than routine XRPD evaluation, and an estimation of the amount of single layer material is possible...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406794/carbon-encapsulated-multi-phase-nanocomposite-of-w-2-c-wc-1-x-as-a-highly-active-and-stable-electrocatalyst-for-hydrogen-generation
#9
Inha Kim, Sung-Woo Park, Dong-Wan Kim
The major challenges related to the activity, stability, and cost of electrocatalysts are being increasingly raised to achieve highly efficient and cost-effective hydrogen generation. Herein, multiphase nanocomposites of W2C@WC1-x encapsulated within graphitic carbon layers were prepared via a facile and effective process of electrical explosion of wires and subsequent heat treatment to serve as a highly active and stable electrocatalyst without any noble metal for hydrogen generation. The single-phase comprising less than 15 nm WC1-x nanoparticles embedded in a lump of amorphous carbon were successfully synthesized via the EEW process in oleic acid used as a carbon source at room temperature...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406791/structural-design-considerations-of-solution-processable-graphenes-as-interfacial-materials-via-a-controllable-synthesis-method-for-the-achievement-of-highly-efficient-stable-and-printable-planar-perovskite-solar-cells
#10
Jun-Seok Yeo, You-Hyun Seo, Chan-Hee Jung, Seok-In Na
Solution-processable graphenes (represented by reduced graphene oxides, rGOs) have shown promising abilities as HTLs in perovskite solar cells (PeSCs). However, there has been no attempt to systematically tailor the characteristics of rGOs to the specifications of PeSCs. Furthermore, the applications of rGO HTLs have been limited to the spin-coating system, which is incompatible with roll-to-roll manufacturing. Here, with the aid of a polymer-graphene hybrid structure and a controllable synthesis method, we successfully developed a much more feasible rGO HTL and demonstrated highly efficient, stable, and printable p-i-n planar PeSCs with facile one-step processing...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406790/an-ultraviolet-and-electric-field-activated-photopolymer-ferroelectric-nanoparticle-composite-for-the-performance-enhancement-of-triboelectric-nanogenerators
#11
Sung-Ho Shin, Daehoon Park, Joo-Yun Jung, Pangun Park, Junghyo Nah
For the development of high performance triboelectric generators (TENGs), it is required to have facile methods to adjust the triboelectric properties of the friction surfaces. In this work, we present the surface charge density modulation of the photopolymer-ferroelectric nanoparticle composite surface by applying ultraviolet (UV) and electric field. By using the photopolymer, the triboelectric surface property was modulated by exposure to UV. In addition, lithographic surface patterning can be easily adopted to enlarge the frictional surface area as well...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406246/superwettable-nanodendritic-gold-substrates-for-direct-mirna-sers-detection
#12
Yongchao Song, Tailin Xu, Li-Ping Xu, Xueji Zhang
By combining a superwettable interface with a nanodendritic gold structure, we have fabricated a superwettable nanodendritic gold substrate for direct SERS detection of multiple concentrations of miRNAs. The nanodendritic gold substrate provides numerous hotspots for Raman signal enhancement, and the superwettable interface ensures the immobilization of droplets in superhydrophilic microwells, which hold great potentials for applications in disease diagnostics.
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406235/design-of-smart-targeted-and-responsive-drug-delivery-systems-with-enhanced-antibacterial-properties
#13
REVIEW
Hao Chen, Yingying Jin, Jingjie Wang, Yuqin Wang, Wenya Jiang, Hangdong Dai, Shuaiyue Pang, Lei Lei, Jian Ji, Bailiang Wang
The use of antibiotics has been an epoch-making invention in the past few decades for the treatment of infectious diseases. However, the intravenous injection of antibiotics lacking responsiveness and targeting properties has led to low drug utilization and high cytotoxicity. More importantly, it has also caused the development and spread of drug-resistant bacteria due to repeated medication and increased dosage. The differences in the microenvironments of the bacterial infection sites and normal tissues, such as lower pH, high expression of some special enzymes, hydrogen peroxide and released toxins, etc...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406233/on-surface-transmetalation-of-metalloporphyrins
#14
Diana Hötger, Paula Abufager, Claudius Morchutt, Patrick Alexa, Doris Grumelli, Jan Dreiser, Sebastian Stepanow, Pietro Gambardella, H Fabio Busnengo, Markus Etzkorn, Rico Gutzler, Klaus Kern
Increasing the complexity of 2D metal-organic networks has led to the fabrication of structures with interesting magnetic and catalytic properties. However, increasing complexity by providing different coordination environments for different metal types imposes limitations on their synthesis if the controlled placement of one metal type into one coordination environment is desired. Whereas metal insertion into free-base porphyrins at the vacuum/solid interface has been thoroughly studied, providing detailed insight into the mechanisms at play, the chemical interaction of a metal atom with a metallated porphyrin is rarely investigated...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30406223/afm-assessing-of-nanomechanical-fingerprints-for-cancer-early-diagnosis-and-classification-from-single-cell-to-tissue-level
#15
REVIEW
Andreas Stylianou, Malgorzata Lekka, Triantafyllos Stylianopoulos
Cancer development and progression are closely associated with changes both in the mechano-cellular phenotype of cancer and stromal cells and in the extracellular matrix (ECM) structure, composition, and mechanics. In this paper, we review the use of atomic force microscopy (AFM) as a tool for assessing the nanomechanical fingerprints of solid tumors, so as to be potentially used as a diagnostic biomarker for more accurate identification and early cancer grading/classification. The development of such a methodology is expected to provide new insights and a novel approach for cancer diagnosis...
November 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/30403221/identification-of-four-single-stranded-dna-homopolymers-with-a-solid-state-nanopore-in-alkaline-cscl-solution
#16
Yusuke Goto, Itaru Yanagi, Kazuma Matsui, Takahide Yokoi, Ken-Ichi Takeda
DNA sequencing via solid-state nanopores is a promising technique with the potential to surpass the performance of conventional sequencers. However, the identification of all four nucleotide homopolymers with a typical SiN nanopore is yet to be clearly demonstrated because a guanine homopolymer rapidly forms a G-quadruplex in a typical KCl aqueous solution. To address this issue, we introduced an alkaline CsCl aqueous solution, which denatures the G-quadruplex into a single-stranded structure by disrupting the hydrogen-bonding network between the guanines and preventing the binding of the K+ ion to G-quartets...
November 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/30403216/3d-ti-3-c-2-t-x-aerogels-with-enhanced-surface-area-for-high-performance-supercapacitors
#17
Xinyu Wang, Qishan Fu, Jing Wen, Xinzhi Ma, Chuncheng Zhu, Xitian Zhang, Dianpeng Qi
Two-dimensional titanium carbide as a novel electrode material has been widely researched in the field of energy storage in recent years. However, the restacking of Ti3C2Tx nanosheets is still a challenge, which largely restricts their development. Here, we employ the 3D architecture of a Ti3C2Tx aerogel to restrict the restacking of 2D Ti3C2Tx nanosheets. This special structure can not only effectively reduce the restacking of 2D materials, but also accelerate the transport of electrolyte ions in the electrode...
November 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/30403215/correction-liposomes-loading-sodium-chloride-as-effective-thermo-seeds-for-microwave-ablation-of-hepatocellular-carcinoma
#18
Qunfang Zhou, Songsong Wu, Ningqiang Gong, Xin Li, Jianping Dou, Mengjuan Mu, Xiaoling Yu, Jie Yu, Ping Liang
Correction for 'Liposomes loading sodium chloride as effective thermo-seeds for microwave ablation of hepatocellular carcinoma' by Jie Yu, Ping Liang et al., Nanoscale, 2017, 9, 11068-11076.
November 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/30403214/optical-properties-of-size-selected-neutral-ag-clusters-electronic-shell-structures-and-the-surface-plasmon-resonance
#19
Chongqi Yu, Romain Schira, Harald Brune, Bernd von Issendorff, Franck Rabilloud, Wolfgang Harbich
We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Agn clusters (n = 5-120) embedded in solid Ne. We compare the spectra to time-dependent density functional calculations (TDDFT) that address the influence of the Ne matrix. With increasing size, several highly correlated electron excitations gradually develop into a single surface plasmon. Its energy is situated between 3.9 and 4.1 eV and varies with size according to the spherical electronic shell model. The plasmon energy is highest for clusters with atom numbers fully filling states with the lowest radial quantum number (e...
November 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/30403213/improved-photovoltaic-performance-of-perovskite-solar-cells-based-on-three-dimensional-rutile-tio-2-nanodendrite-array-film
#20
Chi Chen, Shufang Wu, Jinming Wang, Siyao Chen, Tianyou Peng, Renjie Li
In order to explore high performance and stable perovskite solar cells (PSCs), the design and optimization of electron transport layer (ETL) have been paid more and more attention. Vertically oriented, one-dimensional (1D) TiO2 nanostructured array films are considered superior ETLs because of their rapid electron transporting property and open pore architectures. In this study, a three-dimensional (3D) rutile TiO2 nanodendrite array (RTNDA) film containing 1D trunks and branches was fabricated through second hydrothermal treatment of 1D rutile TiO2 nanorod array (RTNRA) film hydrothermally grown on a fluorine tin oxide (FTO) conductive glass...
November 7, 2018: Nanoscale
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