Normal and Resonant Raman Spectra of CuPc-MWCNT Blend

Abstract:

Understanding molecular electronics is critical in advance of organic devices. Intermolecular interaction between copper phthalocyanine (CuPc) and multi-walled carbon nanotubes (MWCNT) was studied using infrared spectroscopy and confocal Raman microscope. The organics were prepared using solution processing method at ambient atmosphere. The infrared spectrum showed the signal from the lower wavenumber was largely dominated by broad absorption and the lacking of ‘fingerprints’ peaks provided no information on the MWCNT. Raman absorption spectra under normal (λ = 532 nm) and resonant (λ = 633 nm) were obtained to tackle the disadvantages in the former method. Fingerprint peaks of CuPc in frequency of 600 - 1600 cm^-1 emerged under both excitation wavelengths. New 480 cm^-1, 1100 cm^-1 and 1300 cm^-1 peaks were found in resonant spectra. There were no strong evidence of presence and interaction between CuPc and MWCNT detected in these measurements possibly due to overlapping vibrational states between the two compounds and insufficient quantity of MWCNT in the sample.

• Periodical: Key Engineering Materials (Volume 773)
• Pages: 113-117
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.773.113
• Online since: July 2018
• Authors: Siti Zulaikha Ngah Demon*, Nurul Syahirah Nasuha Sa'aya, Nursaadah Ahmad Poad, Siti Hasnawati Jamal
• Keywords: Copper Phthalocyanine, Infrared Absorption, Multi-Walled Carbon Nanotubes, Raman Spectroscopy, Solution Processing, UV-Vis Absorption

References

[1] B. King et al, Vacuum filtration based formation of liquid crystal films of semiconducting carbon nanotubes and high performance transistor devices. Nanotech. 25 (2014) 175201.

DOI: 10.1088/0957-4484/25/17/175201

[2] Y. Hosoi et al, Infrared spectroscopy of pentacene thin film on SiO2 surface, Appl. Surf. Sci. 244 (2005) 607-610.

DOI: 10.1016/j.apsusc.2004.10.131

[3] R. P. Ortiz et al, High-k Organic, Inorganic and Hybrid Dielectrics for Low-Voltage Organic Field-Effect Transistors, Chem. Rev. 110 (2010) 205-239.

DOI: 10.1021/cr9001275

[4] J. Wang et al, Nonlinear optical properties of carbon nanotubes hybrids in polymer dispersions, Mater. Chem. Phys. 133 (2012) 992-997.

[5] J. Wang et al, Carbon nanotubes and nanotube composites for nonlinear optical devices, J. Mater. Chem. 19 (2009) 7425-7443.

[6] J. Wang et al, Linear and nonlinear spectroscopic studies of phthalocyanine-carbon nanotube blends, Chem. Phys. Lett. 465 (2008) 265-271.

DOI: 10.1016/j.cplett.2008.09.073

[7] R. Basu, Effect of carbon nanotubes on the field-induced nematic switching, Appl. Phys. Let. 103 (2013), 241906.

DOI: 10.1063/1.4846676

[8] A. García-García et al, Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes, Beilstein J. Nanotechnol. 6 (2015) 396–403.

DOI: 10.3762/bjnano.6.39

[9] J. Wang et al, The importance of solvent properties for optical limiting of carbon nanotube dispersions, Opt. Comm. 283 (2010) 464-468.

DOI: 10.1016/j.optcom.2009.10.020

[10] Y. Almadori et al, Chromophore ordering by confinement into carbon nanotubes, J. Phys. Chem. C. 118 (2014) 19462.

[11] K. Shirasu et al, Potential use of CNTs for production of zero thermal expansion coefficient composite materials: An experimental evaluation of axial thermal expansion coefficient of CNTs using a combination of thermal expansion and uniaxial tensile tests. Composites: Part A 95 (2017).

DOI: 10.1016/j.compositesa.2016.12.027

[12] X. Ai et al, Phase modification of copper phthalocyanine semiconductor by converting powder to thin film. App. Surf. Sci. 428 (2018) 788-792.

DOI: 10.1016/j.apsusc.2017.09.146

[13] M. Syzbowicz et al, The molecular structure ordering and orientation of the metallophthalocyanine CoPc, ZnPc, CuPc and MgPc thin layers deposited on silicon substrate, as studied by micro-Raman spectroscopy, J. Mater. Sci 46 (2011) 6589-6595.

DOI: 10.1007/s10853-011-5607-4

[14] X. Wang et al, Studies on structure and raman spectroscopy of Ni-doped copper pthalocyanine thin films. App. Surf. Sci. 297 (2014) 188-194.