title: Direct growth of graphene on quartz substrates for label-free detection of adenosine triphosphate.
abstract: We demonstrate that continuous, uniform graphene films can be directly synthesized on quartz substrates using a two-temperature-zone chemical vapor deposition system and that their layers can be controlled by adjusting the precursor partial pressure. Raman spectroscopy and transmission electron microscopy confirm the formation of monolayer graphene with a grain size of ∼100 nm. Hall measurements show a room-temperature carrier mobility above 1500 cm2 V(-1) s(-1). The optical transmittance and conductance of the graphene films are comparable to those of transferred metal-catalyzed graphene. The method avoids the complicated and skilled post-growth transfer process and allows the graphene to be directly incorporated into a fully functional biosensor for label-free detection of adenosine triphosphate (ATP). This device shows a fast response time of a few milliseconds and achieves a high sensitivity to ATP molecules over a very wide range from 0.002 to 5 mM.
authors.affiliation: College of Physics and Electronics, Shandong Normal University, Jinan 250014, People's Republic of China.
authors.forename: Shicai
authors.initials: S
authors.lastname: Xu
authors.forename: Baoyuan
authors.initials: B
authors.lastname: Man
authors.forename: Shouzhen
authors.initials: S
authors.lastname: Jiang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Yue
authors.forename: Cheng
authors.initials: C
authors.lastname: Yang
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.forename: Chuansong
authors.initials: C
authors.lastname: Chen
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D010316:Particle Size; D011791:Quartz / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D011791:Quartz; D006108:Graphite; D000255:Adenosine Triphosphate