Affiliation:
1. BioSense Institute, Nano and Microelectronics Group, Novi Sad
2. Faculty of Technology, Novi Sad
Abstract
Research presented in this article focuses on the preparation of functional
dispersions for inkjet printing of nanoparticles as sensitive layers. The
stable suspensions of MOx(M = Ti, Zn) were prepared using gum arabic (GA)
and Solsperse? 40000 (SO) as dispersants. A special attention was paid to
the monitoring of particle size evolution during the planetary ball milling
of dispersions, so that optimum ratio between milling time and particle size
can be determined. After adjusting the printing parameters, prepared inks
were printed on the flexible PET substrate with interdigitated electrodes
(IDE). Films printed with TiO2 ink stabilized by GA exhibited highly cracked
surface which resulted in low current values, whereas ZnOink stabilized by
SO yielded crack-free surface and much higher current values. All
investigated samples showed linear current behaviour in the range from -5 to
5 V, indicating formation of ohmic contacts between electrodes and
nanoparticles, but ZnO ink produced the highest current values. Gas sensing
properties, tested at room temperature at several humidity levels and for
different types of alcohols, revealed that printed sensor exhibits modest
sensitivity for low humidity levels and slightly higher affinity towards
methanol gas. Photo sensitivity measurement showed very high photocurrent
values with strong potential for optoelectronic applications.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Cited by
6 articles.
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