Aims:  Escherichia coli and Bacillus subtilis spores were treated with an atmospheric plasma mixture created by the ionization of helium and oxygen to investigate the inactivation efficiency of a low‐temperature plasma below 70°C. Methods and results:  An electrical discharge plasma was produced at a radio frequency (RF) of 13·56 MHz, connected to a perforated circular electrode with a discharge spacing of 1–15 mm. The discharge gas was helium with 0–2% oxygen. For the plasma treatment, a dried E. coli cell or B. subtilis endospore suspension on a cover‐glass was exposed to oxygen downstream of the plasma from holes in an RF‐powered electrode. The sterilization effect of the RF plasma was highest with 0·2% oxygen, corresponding to the maximum production of oxygen radicals. Conclusions:  Oxygen radicals generated by RF plasma are effective for the destruction of bacterial cells and endospores. Significance and Impact of the study:  Low‐temperature atmospheric plasma can be used for the disinfection of diverse objects, especially for the inactivation of bacterial endospores.

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Sol-gel derived coating of YBCO film is very attractive for low cost as well as the ease of scalability. Among them, TFA-MOD using metal trifluoroacetates helps avoid the formation of BaCO 3 in the film. But this process has difficulties in optimizing the humid atmosphere to remove HF from the Y-Ba-Cu-O-F systems. So, in this work, another approach to chemical solution without fluorinated precursor was investigated. To make homogeneous stable solution, at first, YBCO powders were synthesized from organic solution containing Y 2 O 3 , BaCO 3 , and CuO powders followed by calcination in air. Dip coatings were carried out from the solution of calcined YBCO powder dissolved into a mixture of methanol and propionic acid on LaAlO 3 (100) substrates. The coated film was annealed by reduced oxygen partial pressure. Dense, homogeneous and biepitaxially grown YBCO films were obtained from dip coating with 5 mm s of drawing speed.

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