Adsorption and desorption phenomena on thermally annealed multi-walled carbon nanotubes by XANES study  

作　　者：Camile Rodolphe Tchenguem Kamto Bridinette Thiodjio Sendja Jeannot Mane Mane 

机构地区：[1]University of Yaounde Ⅰ,Faculty of Science,Department of Physics,Yaounde,Cameroon [2]University of Yaounde Ⅰ,National Advanced School of Engineering,Department of Mathematic and Physical Science,Yaounde,Cameroon [3]University of Dschang,Dschang,Cameroon

出　　处：《Chinese Physics B》2019年第9期145-149,共5页中国物理B（英文版）

摘　　要：The multi-walled carbon nanotubes(MWCNTs) studied in this work were synthesized by the catalytic chemical vapor deposition(CCVD) process, and were thermally annealed by the hot filament plasma enhanced(HF PE) method at 550℃ for two hours.The x-ray absorption near edge structure(XANES) technique was used to investigate the adsorption and desorption phenomena of the MWCNTs at normal and grazing incidence angles.The adsorbates were found to have different sensitivities to the thermal annealing.The geometry of the incident beam consistently gave information about the adsorption and desorption phenomena.In addition, the adsorption of non-intrinsic potassium quantitatively affected the intrinsic adsorbates and contributed to increase the conductivity of the MWCNTs.The desorption of potassium was almost 70% greater after the thermal annealing.The potassium non-intrinsic adsorbates are from a physisorption mechanism whereas the intrinsic adsorbates result from chemisorption.The multi-walled carbon nanotubes(MWCNTs) studied in this work were synthesized by the catalytic chemical vapor deposition(CCVD) process, and were thermally annealed by the hot filament plasma enhanced(HF PE) method at 550℃ for two hours.The x-ray absorption near edge structure(XANES) technique was used to investigate the adsorption and desorption phenomena of the MWCNTs at normal and grazing incidence angles.The adsorbates were found to have different sensitivities to the thermal annealing.The geometry of the incident beam consistently gave information about the adsorption and desorption phenomena.In addition, the adsorption of non-intrinsic potassium quantitatively affected the intrinsic adsorbates and contributed to increase the conductivity of the MWCNTs.The desorption of potassium was almost 70% greater after the thermal annealing.The potassium non-intrinsic adsorbates are from a physisorption mechanism whereas the intrinsic adsorbates result from chemisorption.

关 键 词：multi-walled carbon NANOTUBES thermal ANNEALING adsorption DESORPTION 

分 类 号：O4[理学—物理]