摘要:
A device for sensing hydrogen based on palladium or palladium alloy nanoparticles, wherein the nanoparticles are deposited on a resistive substrate, to permit sensing of less than 1% hydrogen; wherein the nanoparticles are deposited as islands on a continuous resistive layer.
摘要:
A carbon nanotube layer for a field emission cathode where individual carbon nanotubes or small groups of carbon nanotubes that stick out from the surface more than the rest of the layer are avoided. Electron fields will concentrate on these sharp points, creating an enhanced image on the phosphor, resulting in a more luminous spot than the surroundings. Activation processes further free such carbon nanotubes or groups of carbon nanotubes sticking out from the surface, exasperating the problem.
摘要:
A nanoparticle based sensor in which smaller particles are seeded at a higher density to produce a faster response time than that of a sensor using larger particles and less dense seeding. The nanoparticles may comprise palladium nanoparticles. The sensor may be used in hydrogen fuel cells.
摘要:
The present invention is directed to methods and systems of modulating step function phenomena by varying nanoparticle size—particularly wherein a plurality of such nanoparticles are employed, and wherein said nanoparticles comprise a size distribution favorable for collectively smoothing the step function. Such methods and systems are particularly favorable for hydrogen sensors.
摘要:
A high voltage driver with capacitive coupling that is useful in the presence of the high power supply ripple common with higher-voltage systems. It permits extreme ranges of duty cycle, but without the limitations of transformer magnetics, or the increased complexity of optical coupling methods. It is also robust in the presence of voltage transients created by high-voltage arcing to the output drive-line.
摘要:
The present invention provides for variable-range hydrogen sensors and methods for making same. Such variable-range hydrogen sensors comprise a series of fabricated Pd—Ag (palladium-silver) nanowires—each wire of the series having a different Ag to Pd ratio—with nanobreakjunctions in them and wherein the nanowires have predefined dimensions and orientation. When the nanowires are exposed to H2, their lattace swells when the H2 concentration reaches a threshold value (unique to that particular ratio of Pd to Ag). This causes the nanobreakjunctions to close leading to a 6–8 orders of magnitude decrease in the resistance along the length of the wire and providing a sensing mechanism for a range of hydrogen concentrations.
摘要翻译:本发明提供可变范围氢传感器及其制造方法。 这种可变范围氢传感器包括一系列制备的Pd-Ag(钯 - 银)纳米线 - 该系列中的每根线具有不同的Ag与Pd的比例,并且其中纳米区域结合在一起,并且其中纳米线具有预定义的尺寸和取向。 当纳米线暴露于H 2 O 2时,当H 2 O 2浓度达到阈值(对于特定的Pd与Ag的比率是唯一的)时,它们的晶格膨胀。 这导致纳米划痕结合,导致沿导线长度的电阻降低6-8个数量级,并为一定范围的氢浓度提供感测机制。
摘要:
Electronic billboards, which may be indoor or outdoor are located in various geographical areas. Associated with each billboard is a web address. A client desiring to display information, such as an advertisement, on any selected electronic billboard can upload the information over the Internet to the server implementing the billboard website. The client can select the time and duration for the information to be displayed, and can even purchase the display time using a credit card or through the use of some other type of account.
摘要:
A method of micro- and nanotexturing of various solid surfaces in plasma where carbon nanotubes are used as an etch mask. The method allows obtaining textures with feature sizes that can be controlled with the nanotube dimensions and the density of coating the treated surface.
摘要:
Carbon nanotubes, which may or may not be mixed with particles, organic materials, non-organic materials, or solvents, are deposited on a substrate to form a cold cathode. The deposition of the carbon nanotube mixture may be performed using an ink jet printing process or a screen printing process.