Journal
NANOSCALE
Volume 10, Issue 12, Pages 5599-5606Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr08115d
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Funding
- EPSRC grant Challenges in High Resolution Inkjet Printing [EP/L012022/1]
- China Scholarship Council
- University of Manchester
- Parker family
- EPSRC [EP/P025021/1, EP/L012022/1, EP/N010345/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/R00661X/1, EP/S019367/1, EP/L012022/1, EP/P025021/1, EP/N010345/1] Funding Source: researchfish
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Fully printed humidity sensors based on two-dimensional (2D) materials are described. Monolayer graphene oxide (GO) and few-layered black phosphorus (BP) flakes were dispersed in low boiling point solvents suitable for inkjet printing. The humidity sensors were fabricated by printing GO and BP sensing layers on printed silver nanoparticle electrodes. The electrical response of the GO and BP sensors to humidity levels ranges from 11 to 97% relative humidity, which revealed a high capacitance sensitivity of 4.45 x 10(4) times for the GO sensor and 5.08 x 10(3) times for the BP sensor at 10 Hz operation frequency. Response/recovery times of the GO and BP sensor were found to be 2.7/4.6 s and 4.7/3.0 s respectively. These sensors also showed sensitive and fast response to a proximal human fingertip, showing potential applications in contactless switching.
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