期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 9, 页码 3591-3598出版社
AMER CHEMICAL SOC
DOI: 10.1021/am303238r
关键词
electrochemical impedance spectroscopy; biosensors; reduced graphene oxide; pi-stacking interactions; proteins; denaturation
资金
- NRF [2012M1A2A2671795]
- Global Frontier RAMP
- D Program on Center for Multistale Energy System [2012M3A6A7055540]
- Basic Science Research Program [2012-0009158]
- National Research Foundation under the Ministry of Science, ICT Future, Korea
- National Research Foundation of Korea [2012M1A2A2671795] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene-based electrochemical impedance sensors have recently received much attention due to their outstanding sensing capability and economic viability. In this study, we present a novel means of constructing an impedance sensing platform via harnessing intrinsic pi-stacking interactions between probe protein molecules and reduced graphene oxide (RGO) substrate, obviating the need for introducing external chemical groups often required for covalent anchoring of the probes. To achieve this goal, protein molecules used as a probe were denatured to render their hydrophobic residues exposed in order to facilitate their direct pi-stacking interactions with the surface of RGO nanosheets. The protein molecules in denatured form, which would otherwise have difficulty in undergoing pi-stacking interactions with the RGO surface, were found to uniformly cover the RGO nanosheets at high density, conducive to providing a graphene-based impedance sensing platform capable of detecting a probe-specific analyte at high sensitivity. The proof-of-concept performance of thus-constructed RGO-based impedance sensors was demonstrated via selective detection of biological binding events of antigen antibody reaction at a femtomolar range. Notably, since the pi-stacking interaction can occur on the entire RGO surface, it can desirably exclude a backfill process indispensable for the conventional biosensors to suppress background noise signals. Since the procedure of pi-stacking mediated direct deposition of on-purpose denatured protein probes onto the RGO surface is facile and straightforward, the proposed strategy is anticipated to extend its applicability for fabrication of high performance graphene-based bio or chemical sensors.
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