摘要:
A neural probe includes at least one shaft, at least one first electrode disposed on a first side of the at least one shaft, and at least one second electrode disposed on a second side of the at least one shaft. The at least one second electrode is separately addressable from the at least first electrode.
摘要:
An embodiment of the invention provides a neural probe (100) containing a plurality of nanoscale recording electrodes. The recording electrodes have a width of 1 micron or less and a distance between adjacent recording electrodes is 10 microns or less. Another embodiment of the invention provides a neural probe comprising a plurality of microfabricated recording electrodes located on a polymer base material, such as a flexible polymer cantilever.
摘要:
A bioNEMS device comprises a piezoresistive cantilever having flexing legs of which attach the cantilever to a support and a biofunctionalized portion at the tip. A bias current applied to the legs is limited by a maximal acceptable temperature increase at the biofunctionalized tip. The length of the cantilever has a magnitude chosen to minimize background Johnson noise. A catalyzed receptor on the device binds to a ligand whose binding rate coefficient is enhanced. The catalyst lowers the receptor-ligand binding activation energy and is designed by forced evolution to preferentially bind with the ligand. A carrier signal is injected by a magnetic film disposed on the cantilever which is electromagnetically coupled to a source of the carrier signal. A plurality of NEMS fluidicly coupled transducers generate a plurality of output signals from which a collective output signal is derived, either by averaging or thresholding. The NEMS devices are disposed in microfluidic flow channels and fabricated in a membrane. A linking molecule is attached to the tip of the transducer and a fluffball attached to the linking molecule to increase damping.
摘要:
The present invention concerns a device for detecting gases or volatile organic compounds (VOC) comprising an electrically conducting or semiconducting zone functionalized with an organic film resulting from the polymerization of aromatic diazonium salt derived monomer.
摘要:
Doubly-clamped nanowire electromechanical resonators that can be used to generate parametric oscillations and feedback self-sustained oscillations. The nanowire electromechanical resonators can be made using conventional NEMS and CMOS fabrication methods. In very thin nanowire structures (sub-micron-meter in width), additive piezoresistance patterning and fabrication can be highly difficult and thus need to be avoided. This invention shows that, in piezoresistive nanowires with homogeneous material composition and symmetric structures, no conventional and additive piezoresistance loops are needed. Using AC and DC drive signals, and bias signals of controlled frequency and amplitude, output signals having a variety of frequencies can be obtained. Various examples of such resonators and their theory of operation are described.
摘要:
We describe the use of a high-quality-factor torsional resonator of microscale dimensions. The resonator has a paddle that is supported by two nanoscale torsion rods made of a very low thermal conductivity material, such as amorphous (“a-”) silicon. The body of the torsion paddle is coated with an infrared-absorbing material that is thin and light weight, but provides sufficient IR absorption for the applications. It may be placed above a reflecting material of similar dimensions to form a quarter wave cavity. Sensing of the response of the paddle to applied electromagnetic radiation provides a measure of the intensity of the radiation as detected by absorption, and the resulting temperature change, in the paddle.
摘要:
The present invention relates to an apparatus for measuring a mass of a sample, using a nanoelectromechanical system (NEMS) arranged to receive the sample added onto a resonator of the NEMS and a microfluidic sample delivery and sample ionization system. The nanoelectromechanical system is located at an output of the ionization system. The nanoelectromechanical resonator system is highly sensitive and is capable of detecting masses in the single Dalton range.
摘要:
The invention provides lateral nanoelectromechanical switches useful for integration into circuitry fabricated using standard semiconductor processing methods, or using techniques compatible with the mainstream semiconductor processing technologies. Methods of fabricating the switches are described. Some exemplary designs for two and three terminal switches are provided. Descriptions of structural features and the operating parameters for some exemplary switches are given. The switches are expected to be compatible with circuitry that is operable in computer-based systems.
摘要:
We describe the use of a high-quality-factor torsional resonator of microscale dimensions. The resonator has a paddle that is supported by two nanoscale torsion rods made of a very low thermal conductivity material, such as amorphous (“a-”) silicon. The body of the torsion paddle is coated with an infrared-absorbing material that is thin and light weight, but provides sufficient IR absorption for the applications. It may be placed above a reflecting material of similar dimensions to form a quarter wave cavity. Sensing of the response of the paddle to applied electromagnetic radiation provides a measure of the intensity of the radiation as detected by absorption, and the resulting temperature change, in the paddle.
摘要:
A system containing a micro-mechanical or nano-mechanical device and a method of operating the same is provided. The device includes a resonator and a piezoresistive element connected to the resonator. The method includes AC biasing the piezoresistive element at a first frequency, driving the resonator at a second frequency different from the first frequency, and detecting a mechanical response of the resonator at one or both of a difference frequency and a sum frequency of the first and second frequencies.