Examples of HMTA in a sentence
The role of HMTA in the formation of ZnO nanorods was proposed by Strano et al.36 HMTA acts as a nonpolar agent and attaches to the lateral plains of ZnO and causes growth along the polar plane of ZnO.
The formation of urchin-like CuO is due to the ammonia produced through the reaction of HMTA and water.38 HMTA acts as the main source of OH— to form Cu(OH)2 nuclei which further grows into CuO nanowires through dehydration.
Zinc nitrate hexahydrate (ZNH, Zn(NO3)2·6H2O) as a Zn precursor, copper nitrate trihydrate (CN, Cu(NO3)2·3H2O) as a Cu precursor, hexamethylenetetramine (HMTA, C6H12N4 as a pH buffer, and ammonia (NH4OH) and nitric acid (HNO3) for pH adjustment were all purchased from Merck KGaA and were used without any further purification.
Aer that, the modified seed layer substrates were suspended face down in an equimolar concentration (0.025 M) of an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine (HMTA) at a temperature of 90 ◦C for 5 h.
S3 (ESI†) to clarify each morphology in the FESEM images.At a lower concentration of nitric acid (mild acidic media), HMTA provides formaldehyde and ammonia according to the following reactions:35(CH2)6N4 + 6H2O 2 6HCHO + 4NH3 (3) NH3 + H2O 2 NH4+ + OH— (4)The OH— ions formed through reaction (4), react with the Zn2+ and Cu2+ ions, and form Zn(OH)2 and Cu(OH)2, respectively, which is in agreement with the concentration-pH diagrams of ZC3.5 in Fig.