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Facile synthesis of PtPd/SnO2 nanocatalysts with good photo-electrocatalytic property
摘要： PtPd/SnO2 nanocatalysts were synthesized by a simple one-step way of plasma technique in an aqueous solution of tin(II) chloride by using Pt and Pd metal wire as the electrode pair. PtPd/SnO2/GNs composite catalysts were prepared by an ultrasonic mixing PtPd/SnO2 with GNs (GNs, graphene nanosheets). The PtPd/SnO2/GNs composite catalysts exhibit a signi?cantly enhanced electrocatalytic performance, cycling stability and CO-poisoning tolerance towards methanol oxidation both under acidic and alkaline condition, which attributed to the synergism of PtPd alloy and SnO2. What’s more, the current density of PtPd/SnO2/GNs composite catalyst was obviously improved under light illumination, with 10,029 mA mgPt?1 which was about 1.3 times higher than that without light illumination under alkaline condition. The novel one-step plasma technique could provide a useful approach for fabricating other highly e?cient electrocatalysts.
关键词： PtPd nano-alloy,Nanocomposites,Methanol electro-oxidation,Solution plasma,SnO2 nanoparticles
更新于2025-09-09 09:28:46
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Plasma Impact on PI Roughness
摘要： The standard pillar bump structure [1-3] is shown in Figure 2. Polyimide Re-passivation (PI) layer is widely used for pillar bump structure due to the increasingly stringent reliability requirements [4-5]. PI layer serves as stress buffer layer which can enhance the structure reliability performance. And PI will be the direct surface contact material to FCBGA molding compound, so the PI surface roughness is a key factor to the adhesion between PI and molding compound. Lower surface roughness will cause delamination between PI and molding compound while higher surface roughness may cause flip chip process issue like back-grinding tape residue due to higher adhesion between PI and back-grinding tape [6-7]. During the pillar bump process, the PI surface roughness is influenced by many plasma steps like gas and so on. In the present paper, plasma process parameters such as gas, process power and process time are studied in order to get the correlation between these process parameters and PI surface roughness result. This correlation can be used to further study the surface roughness with the assembly site required at the assembly process. As depicted in Figure 3, there are distinctions in the diffraction values of Selected Area Diffraction Pattern (SADP) in different process steps (PI Curing, O2 Descum, RF, Etch, Ar Descum). The influence of different gases plasma on PI surface roughness is quite significant, among which O2 plasma has more significant impact than others, which provides guidance for further research of PI surface roughness in FCBGA
关键词： PI surface roughness,Plasma,PI layer,Adhesion
更新于2025-09-09 09:28:46
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An N-Terminal ER Export Signal Facilitates the Plasma Membrane Targeting of HCN1 Channels in Photoreceptors
摘要： PURPOSE. Hyperpolarization-activated cyclic nucleotide-gated 1 (HCN1) channels are widely expressed in the retina. In photoreceptors, the hyperpolarization-activated current (Ih) carried by HCN1 is important for shaping the light response. It has been shown in multiple systems that traf?cking HCN1 channels to speci?c compartments is key to their function. The localization of HCN1 in photoreceptors is concentrated in the plasma membrane of the inner segment (IS). The mechanisms controlling this localization are not understood. We previously identi?ed a di-arginine endoplasmic reticulum (ER) retention motif that negatively regulates the surface targeting of HCN1. In this study, we sought to identify a forward traf?cking signal that could counter the function of the ER retention signal. METHODS. We studied traf?cking of HCN1 and several mutants by imaging their subcellular localization in transgenic X. laevis photoreceptors. Velocity sedimentation was used to assay the assembly state of HCN1 channels. RESULTS. We found the HCN1 N-terminus can redirect a membrane reporter from outer segments (OS) to the plasma membrane of the IS. The sequence necessary for this behavior was mapped to a 20 amino acid region containing a leucine-based ER export motif. The ER export signal is necessary for forward traf?cking but not channel oligomerization. Moreover, this ER export signal alone counteracted the di-arginine ER retention signal. CONCLUSIONS. We identi?ed an ER export signal in HCN1 that functions with the ER retention signal to maintain equilibrium of HCN1 between the endomembrane system and the plasma membrane.
关键词： forward-traf?c motifs,localization,voltage-dependent Kt channels,inner segment,motif,neuron,signal targeting,ER export,hyperpolarization gated channels,retina,plasma membrane,photoreceptor
更新于2025-09-09 09:28:46
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AZO (ZnO:Al) Transparent Conductive Film Prepared by Plasma Enhanced Chemical Vapour Deposition and its Performances in Comparison with ZnO Film
摘要： In this paper, AZO(ZnO:Al) polycrystalline thin films have been fabricated by PECVD (plasma enhanced chemical vapour deposition) method. Based on PECVD method, the fabrication process of AZO film is shown in detail. Furthermore, the measurements of the film electro-optical properties have been bringing forth, in comparison with ZnO film. The results suggested that based on PECVD method, AZO films with strong adhesion to the substrate, as low as 89 ?/% of square resistance and as high as 85 % of visible light transmittance have been deposited on the glass substrate and the silicon substrate, respectively.
关键词： Transparent conductive film,Plasma enhanced chemical vapour deposition,AZO (ZnO:Al)
更新于2025-09-09 09:28:46
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A monitoring device made of an anodic aluminum oxide template for plasma-induced charging potential measurements in the high-aspect-ratio trench structure
摘要： A monitoring device is proposed to investigate the charge accumulation effects in a high-aspect-ratio trench structure. This monitoring device is made of an anodic aluminum oxide (AAO) template, which is a self-organized material with parallel pores, to demonstrate a high aspect ratio trench structure. A top electrode and bottom electrode were formed in the AAO contact structure for measuring electric potentials. These electrodes can be assumed to be electrically floating due to the very high input resistance of the measurement circuit. Therefore, the electric potentials resulting from the charge accumulation can be measured. In this paper, the fabrication process of the proposed device and experimental demonstrations are presented.
关键词： high-aspect-ratio trench structure,charge accumulation,monitoring device,anodic aluminum oxide,plasma-induced charging potential
更新于2025-09-09 09:28:46
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High-Q-factor nanobeam photonic crystal cavities in bulk silicon carbide
摘要： Silicon carbide (SiC) is a promising optical material for stable and broadband nanophotonics. To date, thin crystalline SiC layers for nanophotonic platforms have been created by ion implantation or growth on other materials, which may cause optical absorption in the SiC layer. We fabricated SiC nanobeam photonic crystal cavities directly from a crystalline (4H) SiC bulk wafer using oblique plasma etching to avoid material-based optical absorptions. The measured quality (Q) factor of the nanobeam photonic crystal cavity reaches 4 (cid:2) 104, which is the highest recorded Q factor in crystalline SiC cavities. Furthermore, we investigated theoretical Q factors by taking into account structural imperfections unique to this fabrication process and compared them with the experimental results.
关键词： oblique plasma etching,nanobeam photonic crystal cavities,structural imperfections,Silicon carbide,quality factor
更新于2025-09-09 09:28:46
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Coherent surface plasmon amplification through the dissipative instability of 2D direct current
摘要： We propose an original concept for on-chip excitation and amplification of surface plasmon polaritons. Our approach, named nanoresotron, utilizes the collective effect of dissipative instability of a 2D direct current flowing in vicinity of a metal surface. The instability arises through the excitation of self-consistent plasma oscillations and results in the creation of a pair of collective surface electromagnetic modes in addition to conventional plasmon resonances. We derive the dispersion equations for these modes using self-consistent solutions of Maxwell’s and 2D hydrodynamics equations. We find that the phase velocities of these new collective modes are close to the drift velocity of 2D electrons. We demonstrate that the slow mode is amplified while the fast mode exhibits absorption. Estimates indicate that very high gain are attainable, which makes the nanoresotron a promising scheme to electrically excite and regenerate surface plasmon polaritons.
关键词： dissipative instability of DC current,electrical excitation of nanoantenna,self-consistent 2D plasma oscillation
更新于2025-09-09 09:28:46
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Nanodisc decorated W-WOx suspended nanowire: A highly sensitive and selective H2S sensor
摘要： In this work we report room temperature synthesis of plasma oxidized, suspended tungsten-tungsten oxide (W-WOx) core-shell nanowire for sensing ppb level H2S. The electric field modulation at the W-WOx interface of the core-shell nanowire strongly influences the sensing performance and brings down the operating temperature all the way down to 50°C, compared to completely oxidized (WOx) nanowire. The optimum interface ratio (W/WOx) of the nanowire shows response of 90.4% (1 ppm) with 6 months of response stability and excellent selectivity. The limit of detection of 10 ppb with response and recovery time of 4 s and 46 s respectively is achieved. To enhance the response further, we utilize nanostructuring on top of nanowire, using nanodiscs of 20 nm, 50 nm and 100 nm diameter and 10 nm height. The nanowire with nanodiscs of 20 nm diameter shows the high repeatable response of 12529% (1 ppm) at 150°C and fast response and recovery times of 12 s and 19 s with detection limit of 0.5 ppb. As we switch from unpatterned to patterned nanowire the observed change in H2S sensing characteristics, indicates that the core-shell nanowire behaviour makes a transition from p-type to n-type. Extensive material characterization is done using UV-Vis spectroscopy, XPS and TEM.
关键词： plasma oxidation,selectivity,Core-shell nanowire,nanodiscs,suspended
更新于2025-09-09 09:28:46
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EFFECTS OF REENTRY PLASMA FLUCTUATION ON POLARIZATION PROPERTIES OF ELECTROMAGNETIC WAVES
摘要： Fluctuations of the reentry plasma sheath can a?ect the propagation of Electromagnetic waves. The relations between ?uctuations and the propagation of electromagnetic waves are analyzed. The e?ects on polarization properties in L-band, S-band and Ka-band during a typical reentry process are studied using methods derived by synthesizing the compressible turbulent ?ow theory, plasma theory, and electromagnetic wave theory together. Results show that in L-band and S-band, the e?ects increase with the altitude, while in Ka-band, the e?ects decrease with altitude. The e?ects at high altitude above 60 km are prominent in L-band and S-band, while the e?ects at middle and low altitude below 60 km in Ka-band are obvious. The e?ects in L-band and S-band are much bigger than that in Ka-band and can a?ect the signal properties of TT&C systems signi?cantly, while the e?ects in Ka-band are much milder. The waves with large oblique incident angle can encounter much more severe conditions than that with small angle.
关键词： Ka-band,reentry plasma sheath,polarization properties,electromagnetic waves,L-band,S-band
更新于2025-09-09 09:28:46
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Patterned Surface Activation of Cyclo-Olefin Polymers for Biochip Applications
摘要： Two different surface activation methods (UV/ozone and oxygen plasma treatment) were applied for patterned surface activation of cyclo-olefin polymer (COP) surfaces combined with different masking techniques (metal shadow mask and protective tape). Surface properties were characterized by various methods such as contact angle measurement, ATR-IR, XPS and Surface enhanced ellipsometric contrast (SEEC) microscopy. UV/ozone and oxygen plasma allowed for patterned surface modification of COP leading to the formation of carboxylic and hydroxyl groups on the activated part of the surface. Stability against organic solvents was determined by rinsing the activated substrates with 2-propanol. For UV/ozone treatment it was found that a thin film of degradation products remains on the COP surface and is at least partly removed in the following washing or rinsing steps.
关键词： polymer photochemistry,Biofunctionalization,plasma modification,surface modification
更新于2025-09-09 09:28:46