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Synthesis of nanocrystalline ZnO powder using ultrasonic atomization technique and application of its thick films for highly toxic gases

L.A. Patil
Pratap College Amalner, IN

Keywords: ultrasonic atomization, nanocrystalline ZnO powder, thick films, Pt-modified ZnO films, CWA simulant sensing, DMMP sensor


ABSTRACT: Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500oC for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO(Pt-ZnO) films was tested on exposure of CWA (chemical warfare agents) simulants, such as, dimethyl methyl phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt-ZnO films showed higher response to DMMP than the responses to CEES and CEPS. Enhanced oxygen adsorption capability due to surface platinum would be the reason of higher response and good selectivity to DMMP. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the simulant sensing performance is discussed.
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