Morita, Koji ; Mera, Gabriela ; Yoshida, Kaname ; Ikuhara, Yuichi ; Klein, Andreas ; Kleebe, Hans-Joachim ; Riedel, Ralf (2013)
Thermal stability, morphology and electronic band gap of Zn(NCN).
In: Solid State Sciences, 23
doi: 10.1016/j.solidstatesciences.2013.06.008
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The thermal behavior of zinc carbodiimide Zn(NCN) was examined in the temperature range between 200 and 1100 °C in Ar atmosphere. The material starts to partially decompose at about 800 °C. Heat treatment at temperatures beyond 800 °C results in the formation of the byproducts nitrogen-containing bamboo-like multiwall carbon-nanotubes of 20–50 nm in diameter due to a partial decomposition of Zn(NCN) into dicyan (CN)2, zinc and nitrogen gas followed by the polymerization of the former product to paracyanogen (CN)n. At 1100 °C, the yield of the residual carbodiimide depends on the dwelling time and the initial amount of powder used for pyrolysis. One hour dwelling at 1100 °C yields ∼50% of the Zn(NCN) separated as pure material. Temperature-induced change in the band structure, namely indirect-to-direct band gap transition, is registered when compared the Zn(NCN) at room temperature with the residual material annealed at 1100 °C. The transition from indirect (Eg = 4.32 eV) to direct band gap (Eg = 4.93 eV) is due to the thermal annealing process which results in healing of crystal defects.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Morita, Koji ; Mera, Gabriela ; Yoshida, Kaname ; Ikuhara, Yuichi ; Klein, Andreas ; Kleebe, Hans-Joachim ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Thermal stability, morphology and electronic band gap of Zn(NCN) |
| Sprache: | Englisch |
| Publikationsjahr: | September 2013 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Solid State Sciences |
| Jahrgang/Volume einer Zeitschrift: | 23 |
| DOI: | 10.1016/j.solidstatesciences.2013.06.008 |
| Kurzbeschreibung (Abstract): | The thermal behavior of zinc carbodiimide Zn(NCN) was examined in the temperature range between 200 and 1100 °C in Ar atmosphere. The material starts to partially decompose at about 800 °C. Heat treatment at temperatures beyond 800 °C results in the formation of the byproducts nitrogen-containing bamboo-like multiwall carbon-nanotubes of 20–50 nm in diameter due to a partial decomposition of Zn(NCN) into dicyan (CN)2, zinc and nitrogen gas followed by the polymerization of the former product to paracyanogen (CN)n. At 1100 °C, the yield of the residual carbodiimide depends on the dwelling time and the initial amount of powder used for pyrolysis. One hour dwelling at 1100 °C yields ∼50% of the Zn(NCN) separated as pure material. Temperature-induced change in the band structure, namely indirect-to-direct band gap transition, is registered when compared the Zn(NCN) at room temperature with the residual material annealed at 1100 °C. The transition from indirect (Eg = 4.32 eV) to direct band gap (Eg = 4.93 eV) is due to the thermal annealing process which results in healing of crystal defects. |
| Freie Schlagworte: | Zinc carbodiimide, Thermal transformation, CNTs, TEM, Band gap |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 20 Feb 2014 13:24 |
| Letzte Änderung: | 16 Aug 2021 09:24 |
| PPN: | |
| Sponsoren: | Financial support by the grants funded under the LOEWE-Zentrum AdRIA (Adaptronik-Research, Innovation, Application), funded by the state of Hesse, Germany and the Fonds der Chemischen Industrie, Frankfurt (Germany) is gratefully acknowledged. |
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