Temperature and Hydrostatic Pressure Effects on the Band Gap of Semiconducting Carbon Nanotubes

2005 ◽  
Author(s):  
Rodrigo B. Capaz
Keyword(s):  
Carbon Nanotubes ◽  
Hydrostatic Pressure ◽  
Band Gap ◽  
Pressure Effects

Hydrostatic pressure effects for controlling the phononic band gap properties in a perfect phononic crystal

2022 ◽  
Vol 54 (2) ◽  
Author(s):  
Ahmed Mehaney ◽  
Ashour M. Ahmed ◽  
Hussein A. Elsayed ◽  
Arafa H. Aly ◽  
Walied Sabra
Keyword(s):  
Hydrostatic Pressure ◽  
Band Gap ◽  
Phononic Crystal ◽  
Pressure Effects ◽  
Phononic Band Gap

scholarly journals Light scattering of double wall carbon nanotubes under hydrostatic pressure: pressure effects on the internal and external tubes

2004 ◽  
Vol 241 (14) ◽  
pp. 3360-3366 ◽  
Author(s):  
P. Puech ◽  
H. Hubel ◽  
D. J. Dunstan ◽  
A. Bassil ◽  
R. Bacsa ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Light Scattering ◽  
Hydrostatic Pressure ◽  
Pressure Effects ◽  
Double Wall

scholarly journals Hydrostatic pressure effects on the structural and electronic properties of carbon nanotubes

2004 ◽  
Vol 241 (14) ◽  
pp. 3085-3085
Author(s):  
Rodrigo B. Capaz ◽  
Catalin D. Spataru ◽  
Paul Tangney ◽  
Marvin L. Cohen ◽  
Steven G. Louie
Keyword(s):  
Carbon Nanotubes ◽  
Hydrostatic Pressure ◽  
Electronic Properties ◽  
Pressure Effects ◽  
Structural And Electronic Properties

scholarly journals Hydrostatic pressure effects on the structural and electronic properties of carbon nanotubes

2004 ◽  
Vol 241 (14) ◽  
pp. 3352-3359 ◽  
Author(s):  
Rodrigo B. Capaz ◽  
Catalin D. Spataru ◽  
Paul Tangney ◽  
Marvin L. Cohen ◽  
Steven G. Louie
Keyword(s):  
Carbon Nanotubes ◽  
Hydrostatic Pressure ◽  
Electronic Properties ◽  
Pressure Effects ◽  
Structural And Electronic Properties

scholarly journals Self-Photoluminescence of Unzipped Multi-Walled Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1632
Author(s):  
Mengyao Chen ◽  
Xiaohua Qi ◽  
Wenna Zhang ◽  
Na Yang ◽  
Di Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Band Gap ◽  
Hummers Method ◽  
Light Region ◽  
Munk Function ◽  
Pristine Cnts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Modified Hummers Method ◽  
Etching Effect

Unzipping of carbon nanotubes (CNTs) has been widely explored to obtain new nanocarbon structures with promising properties. In this work, we report that unzipping of CNTs according to the well-established modified Hummers method produces unzipped CNTs (uCNTs) that exhibit self-photoluminescence that depends on the diameter of pristine CNTs. The uCNTs were characterized using FTIR spectroscopy, XRD, XPS, and Raman spectroscopy indicating that unzipping is accompanied by the introduction of defects and oxygen-containing functional groups. The morphology of CNTs and uCNTs was determined by TEM showing longitude unzipping of CNTs. Our study shows that increasing the diameter of pristine CNTs results in decreasing the edge etching effect and decreasing the functionality of uCNTs. Based on the UV-Vis spectra, the band gap of uCNTs was calculated using the Kubelka–Munk function. The band gap of uCNTs increased with decreasing diameter of pristine CNTs. The uCNTs exhibited photoluminescence with a good emission in the visible light region. The uCNTs with the largest band gap and the highest oxygen content had the strongest fluorescence intensity. Moreover, different metal ions produced different degrees of fluorescence quenching for uCNT-15, which verified the self-photoluminescence of uCNTs.

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