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Influence of duration time of CVD process on emissive properties of carbon nanotubes films

Stępińska I., Kozłowski M., Radomska J., Wronka H., Czerwosz E., Sobczak K.

Materials Science Poland

2015

Vol. 33, No. 1

36--46

In this paper various types of films made of carbon nanotubes (CNTs) are presented. These films were prepared on different substrates (Al2O3, Si n-type) by the two-step method. The two-step method consists of physical vapor deposition step, followed by chemical vapor deposition step (PVD/CVD). Parameters of PVD process were the same for all initial films, while the duration times of the second step – the CVD process, were different (15, 30 min.). Prepared films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and field emission (FE) measurements. The I-E and F-N characteristics of electron emission were discussed in terms of various forms of CNT films. The value of threshold electric field ranged from few V/μm (for CNT dispersed rarely on the surface of the film deposited on Si) up to ~20 V/μm (for Al2O3 substrate).

A vacuum sensor of large measurement scale based on rubbing-processed carbon nanotube films

Su J., He K.-X., Guo D.-Z., Xing Y.-J., Zhang G.-M.

Przegląd Elektrotechniczny

2013

R. 89, nr 1b

134--137

A miniature vacuum sensor with the widest vacuum measurement scale from 5×10-6 to 1×105 Pa by using carbon nanotube (CNT) films as the sensing material is presented. The CNT-films were mechanically rubbed onto quartz-glass substrates, with two electrodes evaporated at the two ends. It is found that the resistance of the CNT-films responses sensitively to the change of vacuum pressure. The mechanism of the sensors relates to the adsorption of water molecules which influences the electron transfer in CNTs and increases the CNT-junction resistivity.

Zaproponowano miniaturowy czujnik próżniowy z szerokim zakresem pomiaru, od 5x10-6 do 1x105Pa, wykorzystujący, jako materiału czułego, błony z nanorurek węglowych (CNT). Błony przetarte są mechanicznie na podłożach ze szkła kwarcowego, na końcach których napylono dwie elektrody. Stwierdzono, że oporność CNT silnie zależy od ciśnienia próżni. Za mechanizm wrażliwości odpowiada adsorpcja cząsteczek wody, co wpływa na przepływ elektronów w CNT i powoduje wzrost oporności złącza CNT.