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ACS Applied Materials & Interfaces

Qingqing Li, Zhen Huang, Pengfei Guan, Rui Su, Qi Cao, Yimin Chao, Wei Shen, Junjie Guo, Hualong Xu, Renchao Che
Oxide materials with redox capability have attracted worldwide attentions in many applications. Introducing defects into crystal lattice is an effective method to modify and optimize redox capability of oxides as well as their catalytic performance. However, the relationship between intrinsic characteristics of defects and properties of oxides has been rarely reported. Herein, we report a facile strategy to introduce defects by doping a small amount of Ni atoms (1.8 at.%) into ceria lattice at atomic level through the effect of microstructure of crystal on the redox property of ceria...
April 26, 2017: ACS Applied Materials & Interfaces
Gokhan Gunay, Melis Sardan Ekiz, Xhenti Ferhati, Barbara Richichi, Cristina Nativi, Ayse Begum Tekinay, Mustafa O Guler
The ability of dendritic cells to coordinate innate and adaptive immune responses makes them essential targets for vaccination strategies. Presentation of specific antigens by dendritic cells is required for the activation of the immune system against many pathogens, and nanoscale materials can be functionalized for active targeting of dendritic cells. In this work, we integrated an immunogenic, carbohydrate melanoma-associated antigen-mimetic GM3-lactone molecule into mannosylated peptide amphiphile nanofibers to target dendritic cells through DC-SIGN receptor...
April 26, 2017: ACS Applied Materials & Interfaces
Xiaohu Luo, Song Yuan, Xinyu Pan, Caixia Zhang, Shuo Du, Yali Liu
Effective prevention of the water, oxygen, and chloride ions held in the hydrotalcite interlayer from diffusing through the layered double hydroxides ( LDH ) layer is crucial importance for its further practical application in the corrosion protection. In this study, a hybrid reduced graphene oxide ( RGO ) nanosheet /Zn2+/Al3+ layered double hydroxides ( RGO/ZnAl-LDH ) composite film with an excellent corrosion protection property on the 6N01 aluminum alloy surface was synthesized by a newly and facile hydrothermal continuous flow method,which can enable direct growth on the substrate...
April 26, 2017: ACS Applied Materials & Interfaces
Peng Huang, Dan Guo, Guoxin Xie
The temperature dependent structure properties of few-layer black phosphorus (BP) nanoflakes supported on the Si substrate and suspended on the holes are investigated using the Raman spectroscopy in the range of 77-293 K. The temperature coefficients of three main Raman modes for supported BP are larger than those of suspended BP because of the interface effects, mainly the tensile strain and the different thermal expansion coefficients (TEC) between the substrate and BP nanoflakes. The out-of-plane vibration is more apt to be affected by the initial strain while the influence on the in-plane vibrations is negligible...
April 26, 2017: ACS Applied Materials & Interfaces
Yo-Han Kim, Eun Yeol Lee, Hyun Ho Lee, Tae Seok Seo
Reduced graphene oxide quantum dot (rGOQD) devices in formats of capacitor and thin film transistor (TFT) were demonstrated and examined as the first trial to achieve non-ambipolar channel property. In addition, through gold nanoparticles (Au NPs) layer embedded between the rGOQD active channel and dielectric layer, memory capacitor and TFT performances were realized by capacitance-voltage (C-V) hysteresis and gate program, erase, and reprogram biases. First, capacitor structure of the rGOQD memory device was constructed to examine memory charging effect featured in hysteretic C-V behavior with a 30 nm dielectric layer of crosslinked polyvinyl alcohol (PVA)...
April 26, 2017: ACS Applied Materials & Interfaces
Hucheng Zhang, Yingying Shang, Jing Zhao, Jianji Wang
This work developed a facile colloidal route to synthesize BH4--capped PdxAgy nanoparticles (NPs) in water using the reducing ionic liquids of [Cnmim]BH4, and the resulting NPs were prone to form the nanocomposites with [amim]+-modified reduced graphene (RG). The removal of the metal-free inorganic ions of BH4- can create the profoundly exposed interfaces on the PdxAgy NPs during the electrooxidation, and favor the ethanol oxidation reaction (EOR) in lowering energy barrier. The counterions of [Cnmim]+ can gather ethanol, OH- ions, and the reaction intermediates on catalysts, and synergistically interact with RG to facilitate the charge transfer in nanocomposites...
April 26, 2017: ACS Applied Materials & Interfaces
Yi-Lin Huang, A Mohammed Hussain, Christopher Pellegrinelli, Chunyan Xiong, Eric D Wachsman
The presence of Cr has already been reported in literature to cause severe degradation to La0.6Sr0.4Co0.2Fe0.8O3- δ (LSCF). However, fundamental understanding of Cr effects on the surface exchange kinetics is still lacking. For the first time in-situ gas phase isotopic oxygen exchange was utilized to quantitatively determine Cr effect on oxygen exchange kinetics of LSCF powder as a function of temperature and water vapor. Our investigations revealed that the formation of secondary phases, such as SrCrO¬4, Cr2O3, Cr-Co-Fe-O, and La-Co-Fe-O, can affect both the oxygen dissociation step and overall surface exchange...
April 26, 2017: ACS Applied Materials & Interfaces
Hee-Soo Kim, Yoong Oh, Ki Hoon Kang, Ju Hwan Kim, Joosun Kim, Chong Seung Yoon
All-solid state Li-rechargeable batteries using a 500-nm-thick LiCoO2 (LCO) film deposited on two NASICON-type solid electrolyte substrates: LICGC(TM) (OHARA Inc.) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) are constructed. The post-deposition annealing temperature prior to the cell assembly is critical to produce a stable sharp LCO/electrolyte interface and to develop a strong crystallographic texture in the LCO film, conducive to migration of Li ions. Although the cells deliver a limited discharge capacity, the LCO/LATP cell is stably cycled for 50 cycles...
April 26, 2017: ACS Applied Materials & Interfaces
Eric S Muckley, Christopher B Jacobs, Keith Vidal, Jyoti P Mahalik, Rajeev Kumar, Bobby G Sumpter, Ilia Ivanov
Understanding the relative humidity (RH) response of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is critical for improving the stability of organic electronic devices and developing selective sensors. In this work combined gravimetric sensing, nanoscale surface probing, and mesoscale optoelectronic characterization are used to directly compare the RH dependence of electrical and optical conductivities and unfold connections between the rate of water adsorption and changes in functional properties of PEDOT:PSS film...
April 26, 2017: ACS Applied Materials & Interfaces
Naresh K Jena, Rafael B Araujo, Vivekanand Shukla, Rajeev Ahuja
Borophene, single atomic-layer sheet of boron (Science, 2015, 350, 1513), is a rather new entrant into the burgeoning class of 2D materials. Borophene exhibits anisotropic metallic properties whereas its hydrogenated counterpart borophane is reported to be a gapless Dirac material lying on the same bench with the celebrated graphene. Interestingly, this transition of borophane also rendered stability to it considering the fact that borophene was synthesized under ultra-high vacuum conditions on a metallic (Ag) substrate...
April 26, 2017: ACS Applied Materials & Interfaces
Shahid Sattar, Udo Schwingenschlögl
In this article, we study the electronic properties of graphene in contact with monolayer and bilayer PtSe2 using first-principles calculations. It turns out that there is no charge transfer between the components because of the weak van der Waals interaction. We calculate the work functions of monolayer and bilayer PtSe2 and analyze the band bending at the contact with graphene. The formation of an n-type Schottky contact with monolayer PtSe2 and a p-type Schottky contact with bilayer PtSe2 is demonstrated...
April 26, 2017: ACS Applied Materials & Interfaces
Lu-Nan Zhang, Siheng Li, Hua-Qiao Tan, Shifa Ullah Khan, Yuan-Yuan Ma, Hong-Ying Zang, Yonghui Wang, Yang-Guang Li
During the exploration of highly efficient noble-metal-free electrocatalysts for hydrogen evolution reaction (HER), a promising and challenging strategy is to fabricate composite nanocatalysts by finely tuning metal and/or non-metal element components. Herein, we report a new HER electrocatalyst, which is composed of molybdenum phosphide and molybdenum carbide composite nanoparticles (NPs) coated by few-layer N-doped graphitic carbon shells (denoted as MoP/Mo2C@C). Such a new combination mode of electrocatalysts is realized by a one-step annealing route with the mixture of a Mo/P-based polyoxometalate (POM) and dicyandiamide...
April 26, 2017: ACS Applied Materials & Interfaces
Kai Han, Wei-Yun Zhang, Zhao-Yu Ma, Shi-Bo Wang, Lu-Ming Xu, Jia Liu, Xianzheng Zhang, Heyou Han
Photodynamic therapy (PDT) holds great promise in tumor treatment. Nevertheless, it remains highly desirable to develop easy-to-fabricated PDT systems with improved tumor accumulation/internalization and timely therapeutic feedback. Here, we report a tumor acidity responsive chimeric peptide for enhanced PDT and noninvasively real-time apoptosis imaging. Both in vitro and in vivo studies revealed that tumor mildly acidic microenvironment could trigger rapid protonation of carboxylate anion in chimeric peptide, which led to increased zeta potential, improved hydrophobicity, controlled size enlargement and precise morphology switch from sphere to spherocylinder shape of chimeric peptide...
April 26, 2017: ACS Applied Materials & Interfaces
Magdalena Perchacz, Ricardo Keitel Donato, Leandro Seixas, Alexander Zhigunov, Rafal Konefal, Magdalena Serkis-Rodzeń, Hynek Benes
This work describes the solvent-free sol-gel synthesis of epoxy-functionalized silica-based precursors, in the presence of 1-butyl-3-methylimidazolium-based ionic liquids (ILs) containing different anions - chloride (Cl(-)) and methanesulfonate (MeSO3(-)). The IL-driven sol-gel mechanisms were investigated in details using experimental characterizations ((29)Si NMR and ATR FTIR spectroscopy) and a theoretical computational method based on density functional theory (DFT). We observed a complex IL's influence on both hydrolysis and condensation steps, involving especially H-bonding and Coulomb coupling stabilization of the process intermediates...
April 26, 2017: ACS Applied Materials & Interfaces
Yanlong Xing, Guoguang Sun, Eugen Speiser, Norbert Esser, Petra S Dittrich
In this work, the microfluidic-assisted synthesis of copper-tetracyanoquinodimethane (Cu-TCNQ) nanostructures in ambient environment is reported for the first time. A two-layer microfluidic device comprising parallel actuated microchambers was used for the synthesis and enabled an excellent fluid handling for the continuous and multiple chemical reactions in confined ultra-small chambers. Different precautions were applied to ensure the reduction state of copper for the synthesis of Cu-TCNQ charge-transfer compounds...
April 26, 2017: ACS Applied Materials & Interfaces
Zachary A Morseth, Toan V Pho, Matthew V Sheridan, Thomas J Meyer, Kirk S Schanze, John R Reynolds, John M Papanikolas
Photoinduced electron injection, intra-assembly electron transfer, and back-electron transfer are investigated in a single-site molecular assembly formed by covalently linking a phosphonated terthiophene (T3) chromophore to a Ru(terpyridine)(bipyridine)(L)2+ (L = MeCN or H2O) water oxidation catalyst adsorbed onto a mesoporous metal oxide (MOx) film. Density functional theory calculations of the T3-trpy-Ru-L assembly indicate that the molecular components are strongly coupled, with enhanced low-energy absorptions owing to the presence of an intra-ligand charge transfer (ILCT) transition between the T3 and trpy moieties...
April 26, 2017: ACS Applied Materials & Interfaces
Boao Liu, Feifan Dang, Zhuanzhuan Tian, Zhao Feng, Deyuan Jin, Wanping Dang, Xiaolong Yang, Guijiang Zhou, Zhaoxin Wu
High triplet energy-level (ET) of ca. 2.83 eV has been achieved in novel polymer backbone through tuning the arrangement of two kinds of building blocks showing enhanced hole injection/transporting capacity. Based on this new polymer backbone with high ET, both blue and white phosphorescent polymers have been successfully developed with trade-off between high ET and enhanced charge carrier transporting ability of the polymer backbones. In addition, their photophysical features, electrochemical behaviors and electroluminescent (EL) properties have been characterized in detail...
April 26, 2017: ACS Applied Materials & Interfaces
Yongsheng Yang, Ke-Zhi Wang, Dongpeng Yan
In this work, we propose that lanthanide cations (such as Eu3+ and Tb3+) doped long-afterglow coordination polymer (CP) can be an effective way to design multi-mode optical logic gates based on their tunable fluorescence/phosphorescence transformation and state-dependent emission. First, multi-color and white-light luminescence across the blue/green/yellow/red visible regions can be obtained by balancing the co-doping ratio of Eu3+/Tb3+ cations and suitable excitations. Additionally, new mechanochromic Eu-Cd-CP was developed based on the mechanism of change in structural symmetry...
April 26, 2017: ACS Applied Materials & Interfaces
Han Sol Lee, Kyunghee Choi, Jin Sung Kim, Sanghyuck Yu, Kyeong Rok Ko, Seongil Im
We report the fabrication of hybrid PN junction diode and complementary (CMOS) inverters, where 2D p-type MoTe2 and n-type thin film InGaZnO (IGZO) are coupled for each device process. IGZO thin film was initially patterned by conventional photolithography either for n-type material in a PN diode or for n-channel of top-gate field-effect transistors (FET) in CMOS inverter. The hybrid PN junction diode shows a good ideality factor of 1.57 and quite a high ON/OFF rectification ratio of ∼3 × 10(4). Under photons, our hybrid PN diode appeared somewhat stable only responding to high-energy photons of blue and ultraviolet...
April 26, 2017: ACS Applied Materials & Interfaces
Li Yin, Xiaocha Wang, Wenbo Mi
Orbital performances are important for inducing and manipulating the perpendicular magnetic anisotropy (PMA) in spintronic devices. Herewith, the orbital-mediated PMA in highly spin-polarized Fe4N are investigated in strained tetragonal Fe4N/BiFeO3(001) heterostructures with the FeAFeB/Fe-O2 termination using the first-principles calculations. Different from the d2 = dxz + dyz + dz(2) favored PMA in previously reported Fe film, for all the Fe4N atomic layers at the biaxial strain of S, all d orbitals (i.e., d1 = dxy + dx(2)-y(2) and d2) make contributions to the PMA at S = 0% and in-plane magnetic anisotropy (IMA) at S = -2 and 2%...
April 26, 2017: ACS Applied Materials & Interfaces
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