title: Ambient Filtration Method To Rapidly Prepare Highly Conductive, Paper-Based Porous Gold Films for Electrochemical Biosensing.
abstract: Thin gold films offer intriguing material properties for potential applications including fuel cells, supercapacitors, and electronic and photonic devices. We describe here an ambient filtration method that provides a simple and novel way to generate rapidly porous and thin gold films without the need for sophisticated instruments, clean-room environments, and any postgrowth process or sintering steps. Using this approach, we can fabricate highly conductive gold films composed of gold nanoparticles layered atop a matrix of metallic single-walled carbon nanotubes on mixed cellulose ester filter paper within 20 min. These hybrid films (thickness ∼40 nm) exhibit fast electron transfer and excellent electrocatalytic properties that are similar to purchased gold films, but with a larger electroactive surface that lends itself to more sensitive analyte detection. We used the neurotransmitters dopamine and serotonin as benchmark analytes to demonstrate that our hybrid gold films can clearly discriminate the presence of both molecules in a mixture with resolution that greatly exceeds that of either purchased gold slides or electrodeposited gold films. Importantly, we postulate that this new approach could readily be generalized for the rapid fabrication of films from various other metals under ambient conditions, and could also be used as a prelude to transferring the resulting films onto glass or other flexible substrates.
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Bhargav
authors.initials: B
authors.lastname: Guntupalli
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Pingping
authors.initials: P
authors.lastname: Liang
authors.affiliation: Department of Chemistry, The University of Chicago , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Jung-Hoon
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Physics, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Yuehai
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Haixiang
authors.initials: H
authors.lastname: Yu
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Juan
authors.initials: J
authors.lastname: Canoura
authors.affiliation: Department of Physics, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Jin
authors.initials: J
authors.lastname: He
authors.affiliation: Department of Physics, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Wenzhi
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Chemistry, The University of Chicago , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Yossi
authors.initials: Y
authors.lastname: Weizmann
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University , 11200 SW 8th Street, Miami, Florida 33199, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xiao
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D005374:Filtration / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D016062:Porosity
chemical_list: D008567:Membranes, Artificial; D006046:Gold
keywords: electrocatalytic response; film conductivity; gold nanoparticles; paper-based hybrid porous gold film; single-walled carbon nanotubes; vacuum filtration