Correlations between switching of conductivity and optical radiation observed in thin graphite-like films

Abstract

The satisfactory explanation of abnormal electromagnetics in thin graphite-like carbon films till now is absent. The most comprehensible explanation may be the high-temperature superconductivity (HTSC). Times of spasmodic switching of electrical conductivity are measured in this work in graphite-like nanostructured carbon films, produced by methods of the carbon arc (CA) and chemical vapor deposition (CVD), which have made 1 and 2 nanoseconds correspondingly. So fast switching completely excludes the thermal mechanism of the process. According to HTSC logic, in the time vicinity close to jump of electroresistance it is necessary to expect the generation of optical radiation in infrared (IR) range. This work presents the first results on registration of IR radiation caused by sharp change of conductivity in thin graphite-like carbon films.

Field-effect switching in nano-graphite films

“…The superconducting hypothesis [19] can explain the results obtained in [1][2][3] as well as the switching behavior of NG films and other our results [5][6][7][8]. First of all the superconducting behavior should be related with steep transition into zero resistive (or high conductive) state.…”

“…4). Also we observed optical radiation emitted few milliseconds after switching off [7]. It is believed this process is related with thermo cooling of sample after switching.…”

“…Later on the attention has been paid to the electromagnetic properties of thin carbon films. Some anomalies in the electromagnetics of the films formed by sputtering of spectroscopic pure graphite in electrical arc discharge and also by chemical vapor deposition (CVD) methods have been found [5][6][7][8]. This was the field effect electrical resistivity jump, which can be used for current limiting in electric circuits and smart chips, the rf-to-dc conversion and the optical radiation emitted after switching off, which can utilized in various optoelectronic devices.…”

Nanographite Films for Solid State Electronic Applications

“…It is interesting to note that after current termination in "OFF" state, the light emission takes place. Some details are published elsewhere [23]. In support of this observation, the light emission has been observed also in relation with conductivity switching effects in semiconducting carbon fibres [24].…”

“…Later on, the attention has been paid to the electromagnetic properties of thin carbon films. Some anomalies in electromagnetics of the films formed by sputtering of spectroscopic pure graphite in electrical arc discharge and also by chemical vapor deposition (CVD) methods have been found [13][14][15][16]. These were the field effect electrical resistivity jump, which can be used for current limiting in electric circuits and smart chips, the rf -to-dc conversion, and the optical radiation emitted after conductivity switching off, which can be utilized in various optoelectronic devices.…”