This document describes research into developing an implantable glucose sensor using sugar-sensitive hydrogels. Phenylboronic acid (PBA)-based hydrogels were synthesized that swell in response to glucose and fructose concentration. Testing showed the 20% PBA hydrogel had high sensitivity and linear response to glucose between 0-25mM, with a low limit of detection of 0.5mM. Electrical impedance spectroscopy measurements on the hydrogel-coated electrodes demonstrated an increase in capacitance with increasing glucose concentration, indicating potential for use in an implantable glucose sensor.