Nanowires

Nanowires

Nanowire based sensors have gained considerable interest as a general platform for ultrasensitive label-free electrical detection of biological and chemical species. These nanowire field effect transistor devices (NW-FETs) exhibit enhanced sensitivity compared to planar sensor platforms, due to the beneficial surface-to volume ratio of the nanowires, i.e. 1-D structure, which might enable single molecule detection.

In NW-FET devices the conductance through the nanowire is affected by the chemical environment, i.e. number of charged species, near the nanowire surface. Accordingly, modification of the nanowire with a molecular coating containing specific receptor-sites allows selective binding and consequent detection of chemical and biological species. In addition, by modifying individual nanowires in an array of nanowires with different receptors selective recognition of many different species in parallel can be accomplished, enabling high throughput screening for diagnostics and drug discovery.

Our surface modification technology has a number of benefits regarding the modification of NW-FET devices: 1) high reproducibility, 2) high chemical stability, 3) low number of interface traps at the organic-semiconductor interface, 4) selective modification of NWs, i.e. the surrounding surface is not modified.


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