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Fully Printed Flexible Chemiresistors with Tunable Selectivity Based on Gold Nanoparticles

 
: Ketelsen, Bendix; Tjarks, Patrick P.; Schlicke, Hendrik; Liao, Ying-Chih; Vossmeyer, Tobias

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Volltext ()

Chemosensors 8 (2020), Nr.4, Art. 116, 14 S.
ISSN: 2227-9040
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IAP ()
sensor; Chemiresistor; gold; nanoparticle; Inkjet; dispenser; printing; flexible

Abstract
This study presents a method for printing flexible chemiresistors comprising thin film transducers based on cross-linked gold nanoparticles (GNPs). First, interdigitated silver paste electrodes are printed onto polyimide (PI) foil via dispenser printing. Second, coatings of GNPs and dithiol/monothiol blends are inkjet-printed onto these electrode structures. 1,9-Nonanedithiol (9DT) is used as cross-linking agent and a variety of monothiols are added to tune the sensors’ chemical selectivity. When dosing these sensors with different analyte vapors (n-octane, toluene, 4-methyl-2-pentanone, 1-butanol, 1-propanol, ethanol, water; concentration range: 25–2000 ppm) they show fully reversible responses with short response and recovery times. The response isotherms follow a first-order Langmuir model, and their initial slopes reveal sensitivities of up to 4.5 × 10−5 ppm−1. Finally, it is demonstrated that arrays of printed sensors can be used to clearly discern analytes of different polarity.

: http://publica.fraunhofer.de/dokumente/N-618505.html