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The application of sensitive gas sensors manufactured in high volume at low cost is of great interest due to an extensive array of potential applications. Such areas include industrial processing, biotechnology and intelligent food packaging. This work reports a straightforward and versatile technique using screen-printing and drop-casting processes, to produce gas sensors on a flexible plastic substrate, based on a combination of metal organic framework and graphene-carbon materials. We demonstrate a sensitive and stable ammonia sensor (4.6% maximal response) over a range from 20 to 100 ppm. The sensitivity of the optimized formulation is 36 times higher than a carbon–graphene only sensor and makes the developed devices suitable for intelligent packaging. The sensor production process is fast, reliable and low-cost and so there is a strong potential for the process principles to be adapted industrially for a different gas target or application. [ABSTRACT FROM AUTHOR]

A hybrid cellulose nanofibril (CNF)–silver nanowire stable suspension has been used as a coating for providing transparent flexible conductive films (TCFs). Homogeneous transparent conductive coatings were obtained on polymeric substrates. Investigations on the opto-electrical properties of films show that the addition of CNFs has no impact on film conductivity and transparency as compared to the values obtained for a neat nanowire film. Performances combining a sheet resistance of 13 ± 3 Ω□−1 with a transparency of 90.1 ± 0.5% at 550 nm were achieved without any additional post-treatment to the film. Additional evaluation of the impact of CNFs on film properties has also revealed that the presence of CNFs allows for the production of TCFs with enhanced adhesion and higher stability towards environmental conditions. [ABSTRACT FROM AUTHOR]