**2. Design and fabrication of a biosensor**

There are many types of biosensors including electrochemical biosensors (potentiometric biosensors, amperometric biosensors, and conductometric biosensors). These biosensors are uniquely designed and fabricated based on their applications. This book chapter will explore the design and fabrication of two biosensors

such as an amperometric electrochemical biosensor and a surface plasmon resonance (SPR) optical biosensor used for glucose level detection or measurement and bioprinting, respectively.
