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Browsing Journal Articles by Author "Ngaruiya, James M."

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Dependence of optical band gap on crystallite size of TIO2 thin films prepared using sol gel process

John, Benjamin M.; Mugo, Simon W.; Ngaruiya, James M. (2021)

We report on a simple and robust analysis of the energy band gap and crystal size of anatase TiO2 thin films on doped Fluorine Tin Oxide (SnO2:F) prepared using sol-gel Doctorblade method. The films had been annealed at ...
Determination of graphene layers by optical imaging contrast analysis

John, Benjamin M.; Ngumbi, Paul K.; Katumo, Ngei; Mugo, Simon W.; Timonah, Nelson S.; Ngaruiya, James M. (2015)

Practical application of graphene require accurate determination of the number of layers. In this paper we demonstrate a reliable and efficient approach for determining the number of graphene layers. Plots of contrast ...
Effect of Annealing Rates on Surface Roughness of TiO2 Thin films

John, Benjamin M.; Mugo, Simon W.; Ngaruiya, James M. (Science and Education Publishing, 2018)

In this work, we report a simple and novel method of determining the morphological properties of TiO2 thin films synthesized by sol-gel doctor-blade method. The TiO2 films were deposited on doped fluorine tin oxide (SnO2:F) ...
Graphene supported platinum counter electrode for dye sensitized solar cells

John, Benjamin M.; Katumo, Ngei; Mugo, Simon W.; Ngaruiya, James M.; Ngumbi, Paul K. (2015)

A Platinum (Pt) film was prepared on graphene-fluorine-doped tin oxide (FTO) substrate through doctor blade procedure and investigated as a counter electrode (CE) for dye sensitized solar cells (DSSCs). Dye loading of ...
Multiple plasmon resonances in small-sized citrate reduced gold nanoparticles

Ngumbi, Paul K.; Mugo, Simon W.; Ngaruiya, James M.; King’ondu, Cecil K. (Elsevier, 2019-05-15)

Metallic nanoparticles exhibit localized surface plasmon resonances resulting from the coherent oscillation of free electrons in response to electric field from incident electromagnetic radiation. In this work, the dependence ...
Optical conductivity of single layer graphene from experimental measurements and theoretical calculations

John, Benjamin M.; Ngumbi, Paul K.; Mugo, Simon W.; Ngaruiya, James M.; King’ondu, Cecil K.; Ngei, K. (AIP Publishing, 2016-12)

With the fast growing research and applications of graphene in photonics, understanding its properties and their correlation over broad spectral range is essential. The study presented herein is an analysis of optical ...

Browsing Journal Articles by Author "Ngaruiya, James M."

Browsing Journal Articles by Author "Ngaruiya, James M."

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