Wireless Bacteria Nanosensor Based on Carbon Nanotubes Functionalized with Ag Nanoparticles

N.I. Alvarez-Colon, A. Arroyo, P. Jirau, C.A. R. Rodriguez Prado, C. Cuyar Cruz, S. Rodriguez, J. Avalos, G. Morell and B. Weiner
University of Puerto Rico- Río Piedras Campus,
United States

Keywords: nanosensor, bacteria, carbon nanotubes

Summary:

Hospital and health communities need a more effective electronic bio-interface to better reduce or eliminate bacterial threat. The biosensor industry fabricates solid devices that are not suitable for biological surfaces such as buccal, skin or any other humid surface. The biological surfaces mentioned above are irregular, for that reason the sensor must possess the ability to attach conformably to such surfaces. In order to solve this problem, we propose a flexible resonance wireless sensor that will detect bacteria and their population density. The bio-sensor consists of a printed radiofrequency wireless sensor made of gold, to which carbon nanotubes and peptides were incorporated. A simple method is devised to deposit highly monodispersed Ag nanoparticles on multi-walled carbon nanotubes (CNTs), which started from an initial modification of Ag nanoparticles. This part of the sensor is attached to a Kapton substrate; this device will neither work with any batteries nor use wire to transfer the information from the bio-sensor to another device. The Kapton based substrate will allow the biotransfer of the sensors onto the biomaterials in a simple and efficient manner. Preliminary results have shown that when exposing the nano and microcrystalline diamond to bacteria a change in resistivity of the material is observed, this will produce changes in the radiofrequency response. This innovative platform to build nanosensors for biomedical applications will improve bioelectronics for interface monitoring.