Abstract:
The known method of nanotransfer printing uses a stamp (10), coated with a metallic layer (40) of less than 10 nm thickness, to transfer the layer (40) from the raised portions (25) of the stamp (10) to a second surface (45). According to the present invention, the remaining layer on the sidewalls (35) and in the recessed portions (30) of the stamp (10) can be used for charge printing on a layer (65) of a material (60), or it can be used as electrodes in chemical and biological measurements.
Abstract:
Methods and apparatuses for generating electrically-conductive and/or semi-conductive films, and more specifically, methods and apparatuses for generating conductive and/or semi-conductive films having nanoscale features are provided. In one embodiment, an electrically-conductive or semi-conductive film (e.g., a gold layer of less than 50 nanometer thickness) is provided on a substrate (e.g., a poly(dimethylsiloxane) (PDMS) stamp). The substrate may optionally include patterns or features having raised and recessed portions. A first portion of the film may be removed from the substrate, e.g., by methods such as physically contacting the first portion of the film with a surface to which the first portion preferentially adheres. This process can leave a second portion of the film remaining on the substrate. In some embodiments, the second portion includes at least one region having a dimension substantially parallel to a portion of the substrate i.e., of less than 50 nanometers. The second portion of the film may be used to establish electrical communication with an electrical contact. Advantageously, electrically-conductive and/or semi-conductive films having nanoscale features can be fabricated over large areas (e.g., areas greater than 1 cm 2 ) in a single step.