Applied Surface Science
ISSN : 0169-4332
Published by: Elsevier BV (10.1016)
Total articles ≅ 52,450
Latest articles in this journal
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151352
Carpet-like and grass-like arranged CuO nanosheets were fabricated on flexible polyethylene terephthalate substrates via the spin-spray method using different complexing agents. The CuO nanostructures strongly adhered to the substrate, and the resulting coated substrates were sufficiently flexible to be used as humidity sensors in a bent state. The humidity-sensing properties were evaluated by exposing the sensors to 20–90% relative humidity at room temperature. The sensor based on the carpet-like CuO nanosheets did not exhibit any humidity response. The grass-like CuO nanosheets had excellent humidity-sensing performance as evidenced by the linear resistance behavior, short response and recovery times of 2.1 s and 2.8 s, respectively, and high sensitivity of up to 170%. In addition, the sensor based on the nanosheets possessed high stability and durability against mechanical bending. The sensitivity and response and recovery times were almost unchanged even when the bending angle was 90° and after 1000 bending-relaxation cycles.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151358
In the study, we report a novel polyimide (PI) delamination process using thermally reduced graphene oxide (rGO) and a Zinc Oxide (ZnO) photocatalyst as a De-Bonding Layer (DBL). The role of rGO was to control the adhesion force between the carrier glass and PI film. The ZnO nanoparticle (NP) was used as a photocatalyst to promote the chemical reaction between reduced graphene oxide and the atmosphere. The adhesion force was reduced safely and reproducibly between the carrier glass and the PI under ultraviolet (UV, 385nm wavelength) irradiation environment, and the optimal rGO and ZnO NP concentration were 0.8 mg/ml and 15 mM, respectively. Finally, amorphous InGaZnO (a-IGZO) TFT was fabricated on the PI substrate with rGO/ZnO NP to confirm the effect of the UV irradiation process on the reliability of the backplane. The a-IGZO TFTs on Glass/rGO/ZnO/PI exhibit the following parameters; Vth: 0.60 ± 0.12 V, µFE: 16.60 ± 0.71 cm2/Vs, and SS: 0.31 ± 0.01. After the dry delamination, there was no significant change in the a-IGZO TFT performance (ΔµFE: 0.17 cm2/Vs, ΔVth: 0.24 V, ΔS·S: 0.00) as well as less than ΔVth<0.3V under the negative/positive bias temperature stability condition (VGS=±20V, 60°C, and 10,000sec)).
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151347
We investigated the surface structure of strained-α-Sn layers grown on InSb(001) surfaces, which have been attracting the attention of the researchers in the field of topological materials, by optimizing the surface cleaning procedures of the InSb substrate surfaces and the growth conditions of the Sn layers. Accordingly, scanning tunneling microscopy observations showed that the (2 × 2) diffraction patterns are due to the double domain (2 × 1) reconstructed surfaces rotated 90° with respect to one another, as previously suggested based on diffraction observations.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151349
In order to widen the application field of microwave absorption (MA) materials, it is still challenging to obtain high-performance MA materials with wide frequency bandwidth, lightweight, thin thickness, and strong absorption by an economical and sustainable method. Herein, the novel coral-like hierarchical structure with zero-dimensional Fe nanocrystals, one-dimensional N-doped carbon nanotubes (CNTs) and three-dimensional porous carbon (PC) matrix is rationally constructed to enhance MA performance. Based on renewable biomass residues, the composite consisted of PC as matrix, bamboo-shaped CNTs with magnetic nanoparticles at the top grow on the surface of PC. By controlling the growth conditions of carbon nanotube, the microstructure and dielectric loss capacity of composite can be manipulated to optimize the impedance matching, reflection loss (RL), and effective absorption bandwidth (EAB, the bandwidth of RL < -10 dB). Benefitting from the unique architecture and hierarchical composite, the composite exhibited a minimum RL of -70 dB at thin thickness of 1.9 mm under low filler content of 12.5 wt%. Even with the thickness of 1.5 mm, the RL could reach -51.8 dB with a broadcast EBA of 5.0 GHz. This work provides an insight for designing advanced microwave absorbers with lightweight, thin thickness, strong RL, and wide EAB.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151342
Ingenious design of catalysts structure is vital for accelerating ammonium perchlorate (AP) thermal decomposition at lower temperature and accompanying with more heat release. In this work, a self-templated approach is adopted to construct hierarchical hollow double-shelled Co3O4 using cobalt glycerate solid spheres as precursors. The structural transformation from the solid species to the hollow double-shelled Co3O4 sphere is implemented by a solution growth combined with a subsequent calcination. The hierarchical hollow double-shelled morphology, large surface area and unique electronic structure endue Co3O4 with enhanced catalytic performance for thermal decomposition of AP. The AP decomposition temperature is decreased to 318 °C and heat release is increased from 491 J g-1 to 1280 J g-1.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151336
In this study, novel binder-free copper-nickel-sulfur (CNS) nanostructures are deposited on 3D Ni foam (CNS/Ni) by a facile hydrothermal technique. A step-wise evaluation of the CNS nanostructures is systematically carried out by varying the hydrothermal reaction times (3, 6, 9, 18, and 27 h). The structural phase, chemical composition, and morphological evolution were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (SEM) respectively. The CNS deposited at 18 h shows interconnected 2D nanoflakes that provide maximum porosity, fast surface redox reaction sites, and improved ionic and electronic conductivity. The electrochemical measurements for CNS-18 show high areal capacitance (2589 mFcm-2), energy density (0.22 mWhcm-2), and power density (7.8 mWcm-2) at a current density of 20 mAcm-2 owing to its high diffusion-controlled contribution (97 %) to the total current as compared to the other CNS samples. The kinetics of the electrochemical measurements are undertaken by the Dunn and Trasatti method. The CNS-18 sample shows long cyclic stability of approximately 81 % up to 7500 cycles. A CNS/AC asymmetric capacitor was fabricated to demonstrate its practical performance. It is surmised that CNS deposited on Ni foam can be used as an efficient electrode in energy storage applications.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151357
Developing the novel types of electrocatalysts with intrinsic stability, high activity and selectivity is a significant mission to advance the sustainable conversion of naturally abundant N2 to NH3, but it remains a long-standing challenge. Herein, through theoretical screening approach, focusing on addressing this challenge, we rationally designed a series of single transition metal (TM) atom decorated on WS2 monolayer as [email protected]2 candidates and systematically explored their potentials for catalyzing N2 reduction by building a full profile of stability, activity and selectivity. Our results unveil that, among 26 candidates, [email protected]2, [email protected]2 and [email protected]2 finally stand out as the most promising candidates, on which the adsorbed N2 molecule can be efficiently converted into NH3 through the distal mechanism with the limiting potentials of -0.37, -0.27 and -0.33 V, respectively, and impressively, the competing HER process can be pronouncedly inhibited. In particular, the activity trend is constructed by using *NNH adsorption energy and φ, and ICOHP reveals the origin of catalytic activity toward NRR. Our investigation not only contributes to the development of the highly efficient electrocatalysts, but also provides insightful views on the optimal design of WS2-based catalysts for advanced NH3 synthesis.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151335
Antimony (Sb) thin film has drawn substantial attention in recent years due to its high carrier mobility, tunable bandgap, superior thermal conductivity, and high stability. Here, two kinds of sb photodetector are presented. The Sb photodetector based on SiO2/Si exhibits fast photoresponse from ultraviolet (UV) to near infrared (NIR) wavelengths and a self-powered behavior without bias voltage. The Sb photodetector based on flexible polyimide (PI) substrate also exhibits self-powered and fast photoresponse features similar to the rigid Sb/SiO2 photodetector, furthermore the flexible photodetector exhibits excellent mechanical flexibility and stable photoresponse under a wide bending range of curvatures and a large number of bending cycles. The results of this work indicate that Sb thin film has a great potential in the development of self-powered, flexible, and broadband photodetector in the future.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151338
Surface charging of an insulating sample has been a significant issue in surface analysis. In time-of-flight secondary ion mass spectrometry, the charge also accumulates on the surface of an insulating sample by the primary ion beam, such as an argon gas cluster ion beam. Such charging can lead to not only degraded mass resolution but also low image resolution, and thus it is necessary to compensate for surface charging of insulating sample. Therefore, several efficient methods have been proposed for charge compensation, such as using a low-energy electron flood gun, applying a bias voltage to the sample stage, and using a gas flooding system. Here, we measured the surface potential of a polymer film to investigate the gas effect on the charge compensation using a Kelvin probe. During the measurements, the chamber pressure was gradually increased by injecting gases, such as He, Ne, Ar, N2, and O2. We found that the injection gas may reduce the surface charging of the sample, depending on the type of gas.
Applied Surface Science; https://doi.org/10.1016/j.apsusc.2021.151356
Black phosphorus (BP), as a promising star of two-dimensional (2D) van der Waals family, has attracted extensive attention for its characteristic dimension effects, mechanical properties and thermal stability. Herein, we report a facile strategy of integrating aryl diazonium modified few Layer black phosphorus with loading of ultrafine yttrium oxide (BP-NH-Y), for reducing the fire hazard of epoxy resin (EP). The results of cone calorimetry test results manifest that the flame retardancy of EP can significantly improve by adding 2 wt% BP-NH-Y, for instance, the peak heat release rate (pHRR) and the total heat release (THR) is reduced by 47.0% and 48.1%, respectively. Especially, adding the BP-NH-Y nanosheets distinctly inhibite the diffusion of EP pyrolysis products (such as toxic CO, hydrocarbons etc.) during flaming. In particular, epoxy composites with only 1.0 wt% BP-NH-Y were able to achieve UL-94V-0 rating with an oxygen index of more than 30. This work may have a promising prospect for developing efficient covalent functionalized BP nanosheets to meet the needs of sustainable applications.