Free-form electronics is driving the bio-medical industry with specifications such as user customization, cost-effectiveness and short response time. Unification of bio- and electronic materials will open doors for wider applications. Integration of electronic materials for bio-sensing is one such field and had garnered much interest. The paper briefly discusses bio-sensors from materials perspective by throwing light on different types of materials and their morphologies for bio-sensors. The advent of 3D printing, making the fabrication cost effective and easy, has further fueled interest in this field. The paper highlights the work in putting down inkjet printed circuits on biomaterials for various applications.