Fabrication

About: Fabrication is a research topic. Over the lifetime, 20475 publications have been published within this topic receiving 235676 citations.

Heterojunction hybrid devices from vapor phase grown MoS2.

Abstract: We investigate a vertically-stacked hybrid photodiode consisting of a thin n-type molybdenum disulfide (MoS2) layer transferred onto p-type silicon. The fabrication is scalable as the MoS2 is grown by a controlled and tunable vapor phase sulfurization process. The obtained large-scale p-n heterojunction diodes exhibit notable photoconductivity which can be tuned by modifying the thickness of the MoS2 layer. The diodes have a broad spectral response due to direct and indirect band transitions of the nanoscale MoS2. Further, we observe a blue-shift of the spectral response into the visible range. The results are a significant step towards scalable fabrication of vertical devices from two-dimensional materials and constitute a new paradigm for materials engineering.

Simple and Low Cost Fabrication of Thermally Stable Polymeric Multimode Waveguides using a UV-curable Epoxy

Abstract: Polymeric multimode waveguides were fabricated using a UV-curable epoxy based polymer (SU-8) as the core layer and Cyclotene as the cladding layer. Contact printing lithography was adopted for the fabrication as a simple and low cost process. The materials are thermally stable up to 200°C as evidenced by the little change in refractive index at the temperature under an atmospheric condition. The propagation loss of the multimode waveguide was 0.36 dB/cm at the wavelength of 830 nm. A micro-mirror was also fabricated by contact printing method with tilted exposure.

Freeform fabrication of zinc‐air batteries and electromechanical assemblies

Abstract: This paper reports on a fabrication platform and extensions to deposition‐based processes that permit freeform fabrication of three‐dimensional functional assemblies with embedded conductive wiring and power sources. Structure and joints are produced by fused deposition of thermoplastics and deposition of elastomers. Conductive wiring is achieved by deposition of various low‐melting‐point alloys and conductive pastes. Batteries based on zinc‐air chemistry are produced by the deposition of zinc, electrolyte, and catalysts, with separator media and electrodes. Details of the deposition processes are provided and several printed assemblies are demonstrated.

Bulk Metallic Glass Micro Fuel Cell

Abstract: Micro fuel cells (MFC) have been identifi ed as promising alternative power sources for portable electronics. Using noncorrosive electrolytes, they offer high theoretical power densities at low operating temperatures, with the potential for stable long-term operation. [ 1 ] Although these attributes make MFCs attractive for many portable device applications, [ 2 ] the primary design challenge is to identify the most effective lowcost materials and fabrication methods. [ 3 ] Here, we present a micro fuel cell in which the catalyst layer, gas diffusion layer, and fl ow fi elds are fabricated from bulk metallic glass (BMG) using thermoplastic forming (TPF). We show that TPF is a scalable and economical technique, for the fabrication of multi-scale BMG components of a MFC. BMGs have high electrical conductivity [ 4 ] and corrosion resistance, [ 5 ] and we demonstrate that end-plates with serpentine fl ow fi elds can be embossed into Zr 35 Ti 30 Cu 8.25 Be 26.75 (Zr-BMG) through a TPFbased process. The BMG fuel cell embodies the processing advantage of TPF into hierarchical structures involving length scales ranging from nanometers to centimeters, [ 6 ] and signifi es the fabrication of fuel cell components from a single material. We show that a hierarchical architecture fabricated through TPF-based embossing of Pt 57.5 Cu 14.7 Ni 5.3 P 22.5 (Pt-BMG) can function as a high-surface area catalyst as well as a porous gas diffusion layer, which allows us to demonstrate the concept of a metallic glass MFC. The ability to create structures over a wide range of length scales combined with remarkable electrochemical properties, suggests applications beyond MFCs, including sensors, lab-on-a-chip platforms, micro-reactors, and heterogeneous catalysis. [ 7 ]