title: Combining protein-shelled platinum nanoparticles with graphene to build a bionanohybrid capacitor.
abstract: The electronic properties of biomolecules and their hybrids with inorganic materials can be utilized for the fabrication of nanoelectronic devices. Here, we report the charge transport behavior of protein-shelled inorganic nanoparticles combined with graphene and demonstrate their possible application as a bionanohybrid capacitor. The conductivity of PepA, a bacterial aminopeptidase used as a protein shell (PS), and the platinum nanoparticles (PtNPs) encapsulated by PepA was measured using a field effect transistor (FET) and a graphene-based FET (GFET). Furthermore, we confirmed that the electronic properties of PepA-PtNPs were controlled by varying the size of the PtNPs. The use of two poly(methyl methacrylate) (PMMA)-coated graphene layers separated by PepA-PtNPs enabled us to build a bionanohybrid capacitor with tunable properties. The combination of bioinorganic nanohybrids with graphene is regarded as the cornerstone for developing flexible and biocompatible bionanoelectronic devices that can be integrated into bioelectric circuits for biomedical purposes.
authors.affiliation: Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University , Suwon 440-746, Republic of Korea.
authors.forename: Boi Hoa
authors.initials: BH
authors.lastname: San
authors.forename: Jang Ah
authors.initials: JA
authors.lastname: Kim
authors.forename: Atul
authors.initials: A
authors.lastname: Kulkarni
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Moh
authors.forename: Sreekantha Reddy
authors.initials: SR
authors.lastname: Dugasani
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Subramani
authors.forename: Nanasaheb D
authors.initials: ND
authors.lastname: Thorat
authors.forename: Hyun Ho
authors.initials: HH
authors.lastname: Lee
authors.forename: Sung Ha
authors.initials: SH
authors.lastname: Park
authors.forename: Taesung
authors.initials: T
authors.lastname: Kim
authors.forename: Kyeong Kyu
authors.initials: KK
authors.lastname: Kim
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000626:Aminopeptidases / Q000737:chemistry*; D025802:Electric Capacitance; D004579:Electron Transport; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D036103:Nanotechnology / Q000295:instrumentation*; D010984:Platinum / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011487:Protein Conformation; D013296:Streptococcus pneumoniae / Q000201:enzymology; D013499:Surface Properties; D014173:Transistors, Electronic
chemical_list: D000538:Aluminum Silicates; D010984:Platinum; D006108:Graphite; D019904:Polymethyl Methacrylate; D000626:Aminopeptidases; C011934:mica
keywords: bionanohybrid; capacitor; graphene; pepA; platinum nanoparticle; protein shell