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0416U000322,
к.ф.-м.н.
02-02-2016
o
Electronic properties of multiwalled carbon nanotubes array containing defects
Mykhailova Halina Yuriivna,
popup.head Nishchenko Mykhail Markovich
popup.opponent Куницький Юрій Анатолійович
popup.opponent Огенко Володимир Михайлович
У дисертації виявлено нові ефекти, які виникають при формуванні об'ємних матеріалів з багатошарових вуглецевих нанотрубок (БВНТ) в процесі навантаження і з'ясовано, на якій стадії передаються масиву переваги ізольованих ВНТ і металевих частинок; встановлено особливості електронної будови ВНТ, суттєвий вплив пружної деформації, дефектів різного генезису, металевих частинок (LaNi5, AlLi, Cu) на процеси порядкування і орієнтацію ВНТ, електропровідність, термо-ЕРС і магнітні властивості. Встановлено, що дефекти БВНТ різного генезису (ростові і радіаційні) по-різному впливають на їх електронну структуру та властивості. Крайові дислокації в БВНТ скорочують шляхи переносу носіїв заряду всередині ВНТ, приводять до зростання на порядок електропровідності та зниження коефіцієнту термо-ЕРС у 2 рази, а радіаційні дефекти, утворені при гамма (1,2 МеВ) і бета (2 і 21 МеВ)-опроміненні, "захоплюють" частину пі-електронів, що змінює електропровідність і збільшує коефіцієнт термо-ЕРС. Встановлено, що при додаванні до ВНТ металевих частинок з меншою роботою виходу, ніж робота виходу нанотрубок, електропровідність зростає до 20 разів в результаті переходу електронів з металу до ВНТ.
2016-02-02
2020-04-03
Updated: 2025-12-14
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