Chen L.C.Lu T.R.Kuo C.T.Bhusari D.M.Wu J.J.Chen K.H.Chen T.M.LI-CHYONG CHEN2022-08-092022-08-09199800036951https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000454396&doi=10.1063%2f1.121662&partnerID=40&md5=e90ac123548c0b6905af09ef1f09b027https://scholars.lib.ntu.edu.tw/handle/123456789/616449Carbon nitride films have been synthesized by argon ion-beam sputtering from a biomolecular compound target, 8-aza-6-aminopurine (C4N6H4). The compound has a six-membered ring structure similar to that existing in the hypothetical β-C3N4. Except for the target material, no other source of nitrogen was used during sputtering deposition. It was found that crystalline carbon nitride with high N/C atomic composition ratios of 0.43-0.56 can be formed even at room temperature. The infrared spectra of the film exhibit two peaks at 1383 and 1643cm-1, corresponding to C-N and CN stretching modes, respectively. No detectable peak at 2200cm-1 (CN stretching mode) is observed. Both x-ray diffraction and transmission electron microscopy show a very strong broad peak at 3.2 Å, comparable to the d spacing of the (110) orientation in the β-C3N4 structure. However, it is suggested that the film contains a nanocrystalline phase with a crystal structure yet to be determined. © 1998 American Institute of Physics.journal article10.1063/1.1216622-s2.0-0000454396