Abstract:
Disclosed herein is an ion-sensitive field-effect transistor (ISFET) (100) having nanostructures (109) for sensing ions and measuring ion concentration in solutions. In general, the base layer (101) at the sensing region of the ISFET (100) is etched to form the nanostructures (109). Each of the nanostructures (109) has a diameter of less than 100nm, and the nanostructures (109) have a distance of less than 100nm from each other. The nanostructures (109) are nanopillars with cylindrical shape, needle-like shape, or a combination thereof. Due to all these particular features, the surface area of the ISFET (100) that is exposed to ions is increased, and therefore the sensitivity and efficiency of the ISFET (100) are improved. Also disclosed herein is a fabrication method thereof.
Abstract:
The present invention provides an etch-free method for conductive electrode formation. The method comprises depositing an insulating layer (104) on a substrate (102), spin coating a first polymer layer (106) on the substrate (102), patterning the first polymer layer (106) by photo-lithography and depositing a conductive metal layer by physical deposition to form a top metallic layer (108) and a bottom metallic layer (110).
Abstract:
The present invention relates to a method of forming a device, more particularly the present invention relates to a method of forming a graphene device by effectively transferring a graphene layer comprising the steps of providing at least a first material (11) layer, depositing at least a second material (12) layer on said at least a first material (11) layer, and depositing at least a catalyst layer (21) on said at least a second material (12) layer for forming nanostructures (22), etching said at least a first material (11) layer, and transferring remaining layers of said at least a second material (12) layer with nanostructures (22) onto at least a substrate (13).
Abstract:
A method of producing vertical nanowires using single catalyst material is provided, the method includes the steps of depositing an insulating oxide or nitride layer (101) on a substrate surface, depositing a gold catalyst layer (103) on top of the insulating oxide or nitride layer (101), annealing the substrate with the gold catalyst layer at temperature above 350°C, such that nanoparticles are formed of a diameter in the range of 1 to 100 nm, growing zinc oxide nanowires from the exposed gold catalyst nanoparticles by chemical vapour deposition (CVD) with diethylzinc as a precursor, and growing silicon nanowires from the remaining gold catalyst nanoparticles with silicon as precursor, such that vertical type zinc oxide nanowires are produced and laterally connected by silicon nanowires wherein the insulating oxide or nitride layer (101) is not required when the substrate is an insulative material.
Abstract:
Described herein is a metal electrode (100) having at least one high aspect ratio structure. The metal electrode (100) comprises a silicon layer (101) having the high aspect ratio structure, an oxide layer (102) on top of the silicon layer (101), an adhesive layer (103) on top of the oxide layer (102), and a metal layer (104) on top of the adhesive layer (103). The thickness of the metal layer (104) is at least 15 times lesser than the height of the high aspect ratio structure. Due to this particular feature, the metal layer (104) is deposited on top of the adhesive layer (103) in a self-aligned manner, taking the shape of the high aspect ratio structure, and disconnected at the wall of the high aspect ratio structure. Further, the metal electrode (100) can be modified accordingly to suit different applications. Also described herein is a method for fabricating the aforementioned metal electrode (100).
Abstract:
A resistive gas sensor device, wherein the gas sensor device operates based on changes in electrical resistivity using nanomaterials interconnectable by conductive bridge electrodes between contact electrodes.