I am wondering if you have suspended silicon membrane (thickness around 5-10um)?
What are Silicon Membranes?
What Silicon Substrates are Used to Fabricate Silicon Membranes?
A researcher requested a qutoe on the following:
Ultra-Thin Silicon - 2" Wafer with 5-10um thickness
Reference #244176 for pricing.
A PhD at a large engineering university requested a quote for the following:
I was wondering would the thin silicon be on top of the thicker silicon as a membrane with window or the thickness of the sample would be 10 um? Thank you in advance.
Actually I was looking to find the silicon membrane with window which thickness of the silicon window between 5-10um and a layer of oxide on that maybe about 0.2 um, and the supporting structure about 500 um (normal wafer).
UniversityWafer, Inc. Quoted:
Our plant can custom make both 5um and 10um with 10*10mm^2 enclosed in thick Si wafer ring, thickness of wafer ring may be 300um or thicker. Quote below:
- Super thin Si, 5+/-1um thick, 10mm squares enclosed in thick Si wafer ring, 100 orientation, P/B or N/P, resistivity: 1-20ohm.cm, DSP to true mirror surface finish on both sides, haze free, and free of pinhole.
- Super thin Si, 10+/-1um thick, 10mm squares enclosed in thick Si wafer ring, 100 orientation, P/B or N/P, resistivity: 1-20ohm.cm, DSP to true mirror surface finish on both sides, haze free, and free of pinhole.
Please reference #161741 for pricing.
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Ultra-Thin Silicon for Suspended Silicon Membranes
A NanoEngineering PhD candidate requested a quote for the following:
I am wondering if you have suspended silicon membrane (thickness around 5-10um)? I would like to have suspended thin silicon membrane. Do you have that?
UniversityWafer, Inc. Quoted
2" Wafer with 5-10um thickness.
Reference #244176 for specs and pricing.
SOI Wafers Used for NanoScale Heat Transfer Study
A graduate student requested thin device layer Silicon-on-Insulator substrate for their research.
We need SOI that can help us fabricate suspended silicon membrane for nanoscale heat transfer study.
Reference #ONL17333 for specs and pricing.
Thermal Oxide Coated Thin Silicon Membranes
A postdoc requested a quote for the following:
We need square diced silicon 10*10 mm^2 with thickness of 10 um and one- side polish and other side has 1 um oxide layer on that.I was wondering for free standing thin membrane with oxide on that would the price.
UniversityWafer, Inc. quoted:
Our plant can supply both 5um and 10um with 10*10mm^2, please ask the client which thickness is requested.
Both sides of these thin Si needs to be polished otherwise there will be a large wafer bow.
For 1um oxide layer, we can use PECVD to deposit oxide on, but 1um is too thick for such thin Si due to the stress, I think 0.2um PECVD should be fine.
Referenece #161741 for specs and pricing.
Transferring Silicon Membranes onto Sapphire Wafers
A nanoengineering student requested a quote for the following:
We want to transfer the Silicon membrane onto a Sapphire wafer. Any chance you could already do that for us? Do you sell Silicon-on-Sapphire wafers by any chance? Do you know a bit more about the surface quality of the SOS. Is it epitaxially grown Silicon? Any idea about the surface roughness?
UniversityWafer Replied:
We suggest client to try using 5mm diameter as we have mature tooling for this small size.
- Surface quality of the SOS - high uniformity
- Silicon epitaxially grown
- Surface roughness standard,Ra</=1.0nm
Reference #196274 for specs and pricing.
Porous Silicon Wafers to Fabricate Silicon Membrane
A PhD student requested help with the following:
I have to purchase porous silicon wafers. Are you able to provide the items for us? Need a non-standard fully porous through silicon
membrane on 4’’ wafer of 500-550 mircon thick (single side
polished). Circular porous area with a diameter of 90 ±1 mm.
Process parameters will be adjusted in order to target pore sizes with a maximum of 10 nm in the front side.
Reference #199001 for specs and pricing.
How Many Kinds of Silicon Membranes are Available?
Silicon-based membranes can be made for a variety of applications, from biomedical applications to advanced automotive parts. They can also be used for electronic devices. The following are a few of the advantages of silicon-based membranes. The material's superior mechanical properties make it an attractive choice for a wide range of applications.
Porous nanocrystalline silicon
Porous nanocrystalline silicon (pnc-Si) membranes are flexible, highly conductive membranes that combine low
membrane thickness with highly controlled pore sizes. Compared to conventional nanoporous membranes, pnc-Si membranes can separate and purify proteins with greater efficiency and speed.
Porous nanocrystalline silicon membranes are made of a thin layer of silicon and a spherical insulating layer of nm-thick silicon oxide. Using a Xactix(r) E2 tool, nm-thick silicon dioxide layers are etched and separated. A release etch is then performed on the silicon wafer samples. The etched silicon samples and the resulting sheet and mesh membranes are separated and transferred to acrylic. The devices are then assembled and tested for leakage.
The pore size of porous nanoporous membranes is typically less than 50 nanometres, with a surface consisting of many small nodules and bumps. The pore size is determined by the space between these nodules. Pores typically range from 1 to 50 nm in size. The pore size translates to low porosity, and the thicker layer provides mechanical support. Pore size can be adjusted through a number of methods, including selecting the starting material and processing route.
Porous nanocrystalline silicon membranes are a novel nanomaterial and have several applications in biotechnology, including cell culture, tissue engineering, and lab-on-a-chip devices. Among these applications is the manufacture of artificial kidneys. This technology allows researchers to build and use a large number of biocompatible devices on a single silicon chip.
Pore formation is correlated with silicon crystallization. The thickness of the bottom oxide layer affects nucleation during SPC of amorphous silicon films. If the bottom oxide layer is too rough, nucleation is inhibited and pore formation is inhibited. In this way, porous nanocrystalline silicon membranes may represent a disruptive technology in medical devices.
Mesoporous silicon
Mesoporous silicon membranes are thin membranes made of silicon. They can be fabricated by using standard microfabrication techniques. Their pore sizes can range from 100 nm to several hundred nanometers. Their periodicity is typically 250-650 nm. They have been demonstrated to be a suitable material for various applications, including biosensors.
Although the materials have yet to be commercialized, their biomedical applications are numerous. These include cell culture, brachytherapy, and biomedical sensors. This review will examine these applications in greater detail. In addition, it will examine the fabrication and surface chemistry of PSi. It will also examine how the material's properties can be varied in order to meet the desired properties.
Mesoporeous silicon membranes can be functionalized with amines to impart specific separation characteristics. The mesopores can be used in the separation of CO2 and CO. However, the process of functionalizing mesoporous silica membranes depends on the type of support material.
The synthesis process of methane and propane on a mesoporous silicon membrane is based on a chemical reaction. It does not require any organic solvents and the membrane is relatively stable. The process also results in a relatively efficient membrane synthesis without degradation to the support membrane.
The PSi Membrane's specific capacity is 1870 mA h g-1 and has a Coulombic efficiency of 93.8%. It also has a high surface area and a stable SEI. SEM examination of the surface of the membrane revealed morphology. Pore diameters had increased by 30% during the lithiation process.
Mesoporous silicon membranes are being studied for use as drug carriers. Several factors must be considered in this process, including biocompatibility, immune evasion, cellular uptake, and tumor targeting. Mesoporous silicon membranes are well-suited for drug delivery because their surface area and surface functionalization are high. However, their diameter is small and they cannot penetrate deep into tumor tissue.
Silica-based membranes
Silica-based membranes are an important part of membrane technology for water treatment applications. The development of composite silica membranes was facilitated by the application of chemical vapor deposition (CVD) techniques. The experiments were performed in a horizontal CVD reactor under controlled temperature and pressure conditions, with differential pressures across the sides of the membranes. The deposition process used TEOS and ozone as deposition precursors. The feed composition included 4.5 wt% water, 95.5 wt% isopropyl alcohol, and a few heavy hydrocarbons. The membranes produced by this process showed improved chemical stability when compared to zeolite A membranes.
Silica-based membranes have a wide range of applications. They can be used in many industries and are particularly suitable for dehydration, pervaporation, and gaseous mixture separation. These membranes are inexpensive and environmentally friendly, and are considered a viable alternative to synthetic membranes. Moreover, silica is abundant and easy to dispose of. Because of their low cost and high-efficiency, membranes made from silica are predicted to dominate the market in the coming decades.
Currently, silica-based membranes are still a developing technology, but there are some major challenges that remain to be overcome. In addition to their inherent flaws, they are hampered by incomplete understanding of their governing mechanisms. For instance, they may not be suitable for high-concentration feed compositions, and they may also be unstable.
Nanopore membranes are emerging as an alternative to silica-based membranes. These membranes are porous and permit small gas molecules to permeate. They are used in gas and hydrogen separation.
Silica-based nanowires
Silica-based nanowires are made of silicon and are used for various kinds of applications, including sensing and detection. Their high surface-to-volume ratio makes them ideal for sensing single molecules. Because of their high conductivity, silicon nanowires can be used for biosensors.
Currently, there are several approaches to synthesising silicon nanowires. The traditional bottom-up approach involves evaporation of a gas, which precipitates silicon. Another method is the use of a metal catalyst to enhance the growth of silicon nanowires. Molecular beam epitaxy (PVD) is another method.
Nanowires made of silicon are ideal for high-density memories, where they can provide high-density memory at low cost. Furthermore, they are also capable of high-speed access and programming. This results in high speed, low-cost, and high-density memory.
A crystalline silica nanowire has the ability to generate second harmonics, which are based on the nonlinearity of surface dipoles and bulk multipoles. In addition, the nanowire can be circular or microstructured. The LP11 multiplet is present in the nanowire structure and is phase-matched by the pump field propagating in the fundamental mode. As the nanowire diameter approaches nanometers, the etching pathway is enhanced, resulting in a thin, straight silica sheath.
Nano-structures made of silica nanowires have been used to develop simple and effective nanoinstrumentation. These nanostructures can be used to deliver drugs to specific areas. The use of silica nanowires in these applications will require a thorough demonstration of their nano-toxicity. But if this is confirmed, these nanostructures can become useful nanomedicines. However, there are still some challenges to overcome before they can be used for drug delivery.
For example, one study investigated the use of silica nanowires for pH sensing. This was achieved by modifying the surface of the silica nanowires with the amino group. The amino group is responsible for changing the surface charge.
Positronium emitted from silicon membranes
Using silicon membranes with pass-through nanochannels, we have studied the amount of positronium emitted forward. We found that the amount of forward emitted positronium is proportional to the thickness and size of the silicon membrane. The results indicate that a membrane with a thickness of seven to 1.3 mm and a nanochannel size of seven to 10 nm will emit a maximum of 16+-5 percent positronium.
In order to produce a high-energy positron, the initial Ps atoms should be 1.2x as large as the maximum m=1 atoms. In order to generate the required amount of Ps, the incoming cylindrically symmetric Gaussian beam has a one-mm FWHM. However, in the BEC, only 40% of the incoming positrons can be converted into Ps. Moreover, in the cavity, only one-fourth of positrons can survive as pure m=1 atoms.
The positron reemission probability is about 67%. For every 30 eV of energy lost by a positron, two positrons should be emitted, producing one Ps per positron. However, some of them might have stuck to the silicon membrane or the diamond surface. In the latter case, they may generate Ps by collisions with silica.
The positronium emitted from silicon membranes is highly useful for scientific research. It can be used to investigate various aspects of the electron population in a sample. For example, Ps can be used to detect the atomic composition of DNA or to study the behavior of DNA.