title: Ultrafast graphene oxide humidity sensors.
abstract: Sensors allow an electronic device to become a gateway between the digital and physical worlds, and sensor materials with unprecedented performance can create new applications and new avenues for user interaction. Graphene oxide can be exploited in humidity and temperature sensors with a number of convenient features such as flexibility, transparency and suitability for large-scale manufacturing. Here we show that the two-dimensional nature of graphene oxide and its superpermeability to water combine to enable humidity sensors with unprecedented response speed (∼30 ms response and recovery times). This opens the door to various applications, such as touchless user interfaces, which we demonstrate with a 'whistling' recognition analysis.
authors.affiliation: Nokia Research Center, 21 JJ Thomson Avenue, Madingley Road, Cambridge CB3 0JE, United Kingdom.
authors.forename: Stefano
authors.initials: S
authors.lastname: Borini
authors.forename: Richard
authors.initials: R
authors.lastname: White
authors.forename: Di
authors.initials: D
authors.lastname: Wei
authors.forename: Michael
authors.initials: M
authors.lastname: Astley
authors.forename: Samiul
authors.initials: S
authors.lastname: Haque
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Spigone
authors.forename: Nadine
authors.initials: N
authors.lastname: Harris
authors.forename: Jani
authors.initials: J
authors.lastname: Kivioja
authors.forename: Tapani
authors.initials: T
authors.lastname: Ryhänen
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D001944:Breath Tests / Q000295:instrumentation*; D017097:Electric Impedance; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D005740:Gases; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D036103:Nanotechnology; D010087:Oxides / Q000737:chemistry; D016062:Porosity; D025341:Principal Component Analysis; D013499:Surface Properties; D013696:Temperature
chemical_list: D005740:Gases; D010087:Oxides; D006108:Graphite