“…These precursors might be gaseous (Silane -(SiH4) and oxygen (O2) mix) [44] , tetra methyle silane-TMS ((CH3)3SiH and oxygen mix) [45] or liquids Hexamethyle disiloxane HMDSO (C6H18OSi2) [46][47][48][49][50][51] , or tetraethoxysilane (TEOS, (C2H5O)4Si [52] , or tetraethylorthosilicate-TEOS (SiC8H20O4) [53,54,21] , hexa methyle disilane-HMDS (C6H18Si2) [55] and mixed siloxane and silazane precursors.…”