Optical band gap and conductivity measurements of polypyrrole-chitosan composite thin films

Abdi, Mahnaz M.; Mahmud, Habibun Nabi Muhammad Ekramul; Abdullah, Luqman Chuah; Kassim, Anuar; Rahman, Mohamad Zaki Ab.; Chyi, Josephine Liew Ying

doi:10.1007/s10118-012-1093-7

Cited by 50 publications

(25 citation statements)

References 24 publications

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“…Conductivity of the chitosan and chitosan-spinach films was determined using the two-point probe method. The output current ( ) was measured for different input voltage ( ) ranging from 0 V to 20 V with the increment of 1 V. The resistance ( ) and the conductance ( ) were obtained by using Ohm's Law [12]:…”

Section: 3mentioning

confidence: 99%

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Role of Metals Content in Spinach in Enhancing the Conductivity and Optical Band Gap of Chitosan Films

Nainggolan

Shantini

Nasution

et al. 2015

Advances in Materials Science and Engineering

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Blend of chitosan and spinach extract has been successfully prepared using acetic acid as a solvent medium to produce chitosan-spinach films. The conductivity measurements showed that chitosan-spinach films for all ratios of 95 : 5, 90 : 10, 85 : 15, and 80 : 20 had better conductivity than the chitosan film. The optical band gap reduced with the addition of the spinach extract into chitosan. Chitosan-spinach film with the ratio of 85 : 15 gave the best electrical properties in this work with the conductivity of 3.41 × 10−6 S/m and optical band gap of 2.839 eV. SEM-EDX spectra showed the existence of potassium, phosphorus, sulphur, iron, and oxygen in chitosan-spinach films. AFM image showed that the surface morphology of the films became rougher as the spinach incorporated into chitosan. The minerals which exist in spinach extract play a role in enhancing electrical properties of chitosan film.

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Section: 3mentioning

confidence: 99%

“…The optical band gap was studied using UV-Vis spectrometer (Perkin Elmer UV-Vis spectrometer Lambda 35). Generally, the band gap energy (Eg) in the semiconductor is determined by the Tauc equation [12] as described in…”

Section: 3mentioning

confidence: 99%

Role of Metals Content in Spinach in Enhancing the Conductivity and Optical Band Gap of Chitosan Films

Nainggolan

Shantini

Nasution

et al. 2015

Advances in Materials Science and Engineering

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“…The emission at 581 nm from T10 Si contributed to the transitions from HOMO level to upper polaron states [32]. The semiconducting properties of these thin films can be attributed to the transition of electrons from highest occupied molecular orbital (HOMO) to the antibonding polaron states [33].…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

IR spectroscopic and photoluminescence studies of plasma polymerized organic thin films based on tea tree oil

et al. 2020

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Plasma-assisted synthesis of transparent, environment friendly, lightweight, flexible and stable organic thin films from naturally occurring precursors were emerging as potential candidates for organic semiconductor industry. In the present study, tea tree (Malaleuca alternifolia) oil based polymer thin films were deposited on glass and silicon substrate by using radio frequency plasma polymerization technique. The polymer thin films were characterized with atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy techniques. AFM images indicate the formation of homogenous film on the substrate surface. FTIR spectra gives bands related to methyl and methylene groups which confirms the formation of chain branching in the polymer films. Relatively intense infrared (IR) bands obtained from films deposited on glass substrate reveals that glass substrate is more favourable for the growth of polymers than silicon substrate. Optical band gap of the polymerized thin film on glass substrate was estimated using Tauc plot which gives a value of 3.19 eV, indicating the semiconducting nature of the material. Photoluminescence (PL) emission in the yellow region were observed from both the samples and its CIE colour coordinates also matches with yellow emission. Broad visible emission observed in the wavelength range 465-695 nm indicates the presence of multichromophores in the polymer film. Samples also gives IR emission in the wavelength range of 850-1090 nm, upon excitation with a wavelength of 785 nm contributed to polaronic transitions.

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“…In order to further evaluate the effect of gold nanoparticles on the electrical and optical properties of the polymeric film we have calculated the energy gap (E gap ) using the Tauc equation: 55 [ahn] n = K(hn À E g ) (1) where n represents the nature of the transition, K is a constant; hn is the photon energy and a is the absorption coefficient obtained from the absorbance (A) and the thickness of the sample (d): 56…”

Section: View Article Onlinementioning

confidence: 99%

Enhanced electrochromic properties of a polypyrrole–indigo carmine–gold nanoparticles nanocomposite

Loguercio

Alves

Thesing

et al. 2015

Phys. Chem. Chem. Phys.

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An indigo carmine doped polypyrrole embedded with gold nanoparticles nanocomposite (PPy-IC-Aunanop) was synthesized by in situ electrochemical polymerization of polypyrrole in the presence of HAuCl4. The nanocomposite was characterized by in situ spectroelectrochemical experiments to study the effect of embedded gold nanoparticles on the electrochromic properties of the material. The results show the formation of a nanocomposite presenting enhanced electrochromic and optical properties, higher electroactivity and 10% lower band-gap energies. The PPy-IC-Aunanop presented a two-fold increase in optical contrast when compared to PPy-IC, in addition to better optical stability.

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Optical band gap and conductivity measurements of polypyrrole-chitosan composite thin films

Cited by 50 publications

References 24 publications

Role of Metals Content in Spinach in Enhancing the Conductivity and Optical Band Gap of Chitosan Films

Role of Metals Content in Spinach in Enhancing the Conductivity and Optical Band Gap of Chitosan Films

IR spectroscopic and photoluminescence studies of plasma polymerized organic thin films based on tea tree oil

Enhanced electrochromic properties of a polypyrrole–indigo carmine–gold nanoparticles nanocomposite

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