Liu W.C.,Applied MicroStructures |
Guo B.L.,Applied MicroStructures |
Wu X.S.,Nanjing University |
Zhang F.M.,Applied MicroStructures |
And 3 more authors.
Journal of Materials Chemistry A | Year: 2013
We developed a facile hydrothermal method for synthesizing ultrafine size-controllable earth-abundant Cu2ZnSnS4 (CZTS) nanocrystals using simple Cu(ii), Zn(ii) and Sn(ii) inorganic salts and thiourea in a mixed ethylenediamine and di-water solution as precursors. X-ray diffraction, Raman scattering and transmission electron microscopy confirm that pure kesterite structure CZTS nanocrystals have been synthesized at temperatures as low as 180 °C. Broadening of Raman peaks and blue-shift of the absorption edge is attributed to quantum confinement within the nanocrystals. The hydrophilism and tunable band-gap of the CZTS nanocrystals show the potential applications of the nanocrystals for biological labelling and quantum dot based solar cells. © 2013 The Royal Society of Chemistry.
Li Z.,Applied MicroStructures |
Li Z.,Nanjing University |
Feng J.,Applied MicroStructures |
Feng J.,Nanjing University |
And 4 more authors.
Nano Today | Year: 2015
Summary The photocatalytic and photoelectrochemical reduction of water or CO2 is an intriguing approach to producing sustainable solar fuels, and has attracted growing and intense interest. Nanostructuring of photocatalysts and photoelectrodes has been proven to be a strong strategy to dramatically improve overall solar-to-fuel conversion efficiencies. Another technological barrier for the practical implementation of solar fuel production is long-term material durability, which has recently been well addressed through use of conformal coatings of protective layers onto the narrow band-gap semiconductors that are suitable for efficient solar-to-fuel conversions but photoelectrochemically unstable. These significant progresses may lead us to the practical implementation of solar fuel production. In this review, we will focus on these exciting progresses achieved using nanostructuring strategies, specifically regarding how the nanostructure influences the charge transport and separation; special attention will be paid to how a nanoscale coating (overlayer) passivates the surface states, thereby reducing the surface electron-hole recombination, and how a nanoscale coating (protective layer) prevents the photocorrosion or photopassivation of the semiconductors with optimal band gaps. We hope that the design strategies using these nanostructures will offer new and greater opportunities for efficient solar fuel production to existing photocatalytic and photoelectrochemical systems. © 2015 Elsevier Ltd.
Yao Y.B.,Hong Kong Polytechnic University |
Yao Y.B.,King Abdullah University of Science and Technology |
Liu W.C.,Hong Kong Polytechnic University |
Liu W.C.,Applied MicroStructures |
Mak C.L.,Hong Kong Polytechnic University
Journal of Alloys and Compounds | Year: 2012
Samarium (Sm 3+) doped BiFeO 3 (BFO) ceramics were prepared by a modified solid-state-reaction method which adopted a rapid heating as well as cooling during the sintering process. The pyroelectric coefficient increased from 93 to 137 μC/m 2 K as the Sm 3+ doping level increased from 1 mol% to 8 mol%. Temperature dependence of the pyroelectric coefficient showed an abrupt decrease above 80 °C in all samples, which was associated with the increase of electrical conductivity with temperature. This electrical conduction was attributed to oxygen vacancy existing in the samples. An activation energy of ∼0.7 eV for the conduction process was found to be irrespective of the Sm 3+ doping level. On the other hand, the magnetic Néel temperature (T N) decreased with increasing Sm 3+ doping level. On the basis of our results, the effects of Sm doping level on the pyroelectric and electrical properties of the BFO were revealed. © 2011 Elsevier Ltd. All rights reserved.
Shi Y.,Applied MicroStructures |
Li S.,Applied MicroStructures |
Guo R.,Applied MicroStructures |
Liu R.,Applied MicroStructures |
And 2 more authors.
Optics Express | Year: 2013
A novel concavely apodized (CA) distributed feedback (DFB) semiconductor laser was theoretically analyzed and experimentally demonstrated. The CA grating profile is equivalently realized by changing the duty cycle of the sampling structure along the cavity in the middle of which an equivalent phase shift is also inserted. Because the basic grating (seed grating) is uniform, only a common holographic exposure and a μmlevel photolithography are required. Therefore, the fabrication cost is highly reduced compared with the true CA grating whose index modulation continuously changes along the cavity. The experimental results show that the laser has good single longitudinal mode operation. © 2013 Optical Society of America.
Applied MicroStructures | Date: 2014-11-12
The present invention is related to carbon-doped metal oxide films. A method of depositing a low friction metal oxide film on a substrate is provided, including: using an atomic layer deposition technique, wherein said metal oxide film is deposited using at least an organo-metallic precursor, and wherein said substrate is at a temperature of 150 C. or lower during deposition of said metal oxide film, whereby a carbon-doped metal oxide film is obtained. The carbon-doped metal oxide films provide a low coefficient of friction, for example ranging from about 0.05 to about 0.4. In addition, the carbon-doped metal oxide films provide anti-stiction properties, where the measured work of adhesion is less than 10 J/m^(2). In addition, the carbon-doped metal oxide films provide unexpectedly good water vapor transmission properties. The carbon content in the carbon-doped metal oxide films ranges from about 5 atomic % to about 20 atomic %.
Applied MicroStructures | Date: 2012-05-22
A vapor delivery apparatus for providing a precursor vapor for a vapor deposition process includes a precursor container for holding a liquid or solid precursor. A first temperature control assembly maintains the precursor container at a first temperature to generate a vapor precursor from the liquid or solid precursor. An isolation valve is coupled to the precursor container, and a specific quantity of the vapor precursor is accumulated in an expansion volume. A fill valve, which is coupled to each of the isolation valve and the expansion volume, controls the flow of the vapor precursor from the precursor container into the expansion volume. A second temperature control assembly maintains the isolation valve at a second temperature greater than the first temperature.
Applied MicroStructures | Date: 2013-08-05
A moisture barrier coating for protecting a substrate from moisture, comprises an inorganic layer disposed over the substrate, the inorganic layer comprising an oxide or nitride of an element selected from the group consisting of silicon, aluminum, titanium, zirconium, hafnium and combinations thereof; and an organic silicon-containing layer disposed over the inorganic layer.
Applied MicroStructures | Date: 2013-08-05
An article having a surface treated to provide a protective coating structure in accordance with the following method: vapor depositing a first layer on a substrate, wherein said first layer is a metal oxide adhesion layer selected from the group consisting of an oxide of a Group IIIA metal element, a Group IVB metal element, a Group VB metal element, and combinations thereof; vapor depositing a second layer upon said first layer, wherein said second layer includes a silicon-containing layer selected from the group consisting of silicon oxide, silicon nitride, and silicon oxynitride; and vapor depositing a third layer upon said second layer, wherein said third layer is a functional organic-comprising layer, wherein said functional organic-comprising layer is a SAM.
Applied MicroStructures | Date: 2016-11-21
COATINGS APPLIED TO SUBSTRATES; NAMELY, THIN FILM COATINGS, LUBRICATION COATINGS, WETTING LAYER COATINGS, ANTI-STICTION COATINGS, COUPLING AGENT COATINGS, BONDING AGENT COATINGS, ADHESION LAYER COATINGS, SURFACE MODIFYING COATINGS, MONOLAYER DEPOSITION COATINGS, NANOFILM DEPOSITION COATINGS, AND RELEASE LAYER COATINGS, APPLIED TO A VARIETY OF SUBSTRATES, IN THE FORM OF; BIOACTIVE SURFACES, BIOIMPLANTABLE SURFACES, MEDICAL DEVICE SURFACES, SURGICAL DEVICE SURFACES, DENTAL DEVICE SURFACES, OPTICAL DEVICE SURFACES INCLUDING LENSES, WIRE AND CABLE AND FLUID FLOW CONDUIT SURFACES, MOVING MACHINERY SURFACES, LIQUID HANDLING SURFACES, SOLAR CELL SURFACES, ELECTRONIC INTERFACE SURFACES, BATTERY SURFACES, FUEL CELL SURFACES, PRINTING DEVICES SURFACES INCLUDING NANO IMPRINTING SURFACES, ROCKET AND MISSILE AND SATELLITE COMPONENT SURFACES, MIRROR SURFACES, MICROSTRUCTURE SURFACES INCLUDING SENSOR AND ACTUATOR AND SWITCH SURFACES, AND MICRO-OPTICAL DEVICE SURFACES. MACHINERY FOR TREATING AND COATING A VARIETY OF SUBSTRATES, OPTIONALLY INCLUDING SOFTWARE AND COMPUTER-DRIVEN CONTROL SYSTEMS SOLD AS A UNIT, namely, POWER OPERATED VAPOR DEPOSITION COATING MACHINERY, PLASMA GENERATION MACHINERY, AND VACUUM GENERATION MACHINERY FOR USE IN COMBINATION WITH VAPOR DEPOSITION COATING MACHINERY. REPAIR AND REFURBISHMENT OF VAPOR DEPOSITION MACHINERY SYSTEMS, PLASMA GENERATION EQUIPMENT, AND VACUUM GENERATION EQUIPMENT. SUBSTRATE TREATMENT SERVICES EMPLOYING VAPORS AND PLASMAS, AND SUBSTRATE COATING APPLICATION SERVICES EMPLOYING VAPOR DEPOSITION TECHNIQUES.