Abstract: The invention relates to a compact thermal reactor for rapid growth of high quality carbon nanotubes (CNT2) produced by chemical process with low power consumption comprising: a processing chamber having a vacuum vessel, the vacuum vessel having a side cover formed of a first side wall and a second side wall, a top cover, a bottom cover connected to a support stand; feed through housing provided with a substrate; a heating system consisting of a heating element and back means; and at least one each inlet and outlet for gas injection into the process chamber for growing high quality carbon nanotubes over the substrate.

Abstract: The invention relates to a process of making ammonia gas indicator, using single wall carbon nanotubes (SWCNTs)/alumina (Al2O3) composite thick film, comprising the steps of (a) preparing a nanoporous SWCNTs/Al2O3 composite thick film of thickness in the range of 60 to 65?m prepared by sol-gel process; (b) curing the film at a temperature in the range of 450° C. to 500° C. for a time period in the range 0.5 to 2 hour to obtain a cured sample; (c) providing thick film planar electrodes of Ag—Pd paste on same side of the cured sample by screen printing; and (d) heat treating the resultant cured sample with electrodes at a temperature in the range of 800° C. to 850° C. for a time period in the range of 0.5 to 2 hours to obtain a gas indicator.