title: Long-wavelength infrared sensing by cytochrome C protein thin film deposited by the spin coating method.
abstract: High infrared absorption, large temperature coefficient of resistance (TCR) and small 1/f noise are preferred characteristics for sensing materials used in bolometers. In this paper, we discuss a cytochrome c protein as a potential sensing material for long-wavelength bolometers. We simulated and experimentally proved high infrared absorption of cytochrome c in the wavelength between 8 μm and 14 μm. Cytochrome c thin films were deposited on a hydrophilic surface using the spin coating method. The resistance variation with temperature is measured and we show that the TCR of cytochrome c thin films is consistently higher than 20%. The measured values of 1/f noise were as low as 2.33 × 10⁻¹³ V²/Hz at 60 Hz. Finally, we test the reliability of cytochrome c by measuring the resistance changes over time under varying conditions. We found that cytochrome c thin films deteriorated significantly without appropriate packaging.
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Roosevelt Road, Section 4, Taipei 10617, Taiwan. gdjsu@cc.ee.ntu.edu.tw.
authors.forename: Bo-Yu
authors.initials: BY
authors.lastname: Lai
authors.forename: Chung-Hao
authors.initials: CH
authors.lastname: Chu
authors.forename: Guo-Dung John
authors.initials: GD
authors.lastname: Su
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D045304:Cytochromes c / Q000737:chemistry*; D007259:Infrared Rays; D008567:Membranes, Artificial
chemical_list: D008567:Membranes, Artificial; D045304:Cytochromes c