If you’re interested in biosensors, I suggest you first check out wikipedia. Here’s the link. Other good sources are:

If you want more information on biosensors, just drop me a message and I’ll get back to you with more resources. For one of my fourth-level courses I completed a report on “Rapid Detection of Food-Borne Pathogens,” where I talk a little about biosensors. I’d be more than willing to share this report with you!