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Fernando, C. A. N.
- Photo-Current Enhancement in the Cu/rGO/n-Cu2O Photo-Electrode at Electrolyte Interface
Abstract Views :178 |
PDF Views:3
Authors
Affiliations
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 6, No 1 (2016), Pagination: 32-36Abstract
A simple method was found to fabricate Cu/rGO/n-Cu2O photo-electrode to enhance the photocurrent with compared to the device Cu/n-Cu2O photo-electrode at semiconductor-electrolyte interface. Reduced graphene oxide (rGO) was fabricated on a well cleaned copper sheet using electrophoretic deposition (EPD) technique to fabricate Cu/rGO. Thereafter Cu/rGO electrode was boiled in a 10-4M CuSO4 solution to fabricate Cu/rGO/n-Cu2O photo-electrode for the first time. Here The rGO acts as a good electron acceptor ton-Cu2O photo-generated electrons enhancing the charge separation process suppressing the recombination process of the photo-generated charge carriers.Keywords
n-Cu2O, rGO, Photoelectron Chemical Cell.
References
- Tran, P. D., Batabyal, S. K., Pramana, S. S., Barber, J., Wong, L. H., and Loo Nanoscale, S. C. J. (2012). A cuprous oxide–reduced graphene oxide (Cu 2 O–rGO) composite photocatalyst for hydrogen generation: employing rGO as an electron acceptor to enhance the photocatalytic activity and stability of Cu 2 O, 4, 3875-3878
- Fernando, C. A. N., and Wetthasinghe, S. K. (2000). Sol. Energy Mater. Sol. Cells, 63, 299-308
- Prashant, V. K. (2011). Journal of Physical Chemistry Leters, 2, 242-251
- Guo, S., Zhang, G. K. Guo, Y. D., and Yu, J. C. (2013). Carbon, 60, 437-444
- Hu, S. J., Chi, B., Pu, J., and Jian, L., (2014). RSC Advances, 4, 60437-60444
- An, S. J., Zhu, Y., Lee, S. H., Stoller, M. D., Emilsson, T., Park, S., Velamakanni, A., An, J., and Ruoff, R. S. (2010). The Journal of Physical Chemistry Letters, 1, 1259
- Hummers, W. S., and Offeman, R. E. (1958). Journal of the American Chemical Society, 80, 1339
- Fernando, C. A. N., De Silva, P. H. C., Wethasinha, S. K., Dharmadasa, I. M., Delsol, T., and Simmonds, C. M. (2002). Renew. Energy, 26, 521-529
- Zhang, Y., Tang, Z., Fu, X., and Xu, Y. (2010). ACS Nano, 4, 7303-7314
- Photo-Current Enhancement at Cu/P-Cu2O/rGO-Electrolyte Interface
Abstract Views :204 |
PDF Views:3
Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 6, No 1 (2016), Pagination: 37-41Abstract
A considerable photocurrent enhancement was found at the Cu/p-Cu2O/rGO-electrolyte interface in a photo-electrochemical cell with compared to that of Cu/p-Cu2O-electrolyte interface. The reason for the photocurrent enhancement may be due to the efficient charge separation process provided at Cu/p-Cu2O/rGO-electrolyte interface. Here rGO (reduced graphene oxide) acts as an electron acceptor for the photo-generated charge carriersas it readily accept electrons from the conduction band of p-Cu2O. rGO was synthesized using electro-phoretic deposition (EPD) technique. Fabricated samples were characterized using diffuse reflectance spectra, photocurrent action spectra and the time development of the photocurrent of photo-electrochemical cells.Keywords
Photo-Current, Electrolyte Interface, Photo Electrochemical Cell.References
- Hagfeldt, A., Boschloo, G., Sun, L., Kloo, L., and Pettersson, H. (2010). Chem. Rev., 110, 6598
- Tran, P. D., Batabyal, S. K., Pramana, S. S., Barber, J., Wongand, L. H., and Loo, S. C. J. (2012). Nanoscale, 4, 3875
- An, S. J., Zhu, Y., Lee, S. H., Stoller, M. D., Emilsson, T., Park, S., Velamakanni, A., An, J., and Ruoff, R. S. (2010). Journal of Physical Chemistry Letter, 1, 1259
- Musa, A. O., Akomolafe, T., and Carter, M. J. (1998). Solar energy Materials and solar cells, 51, 306
- Abdu, Y., and Musa, A. O. (2009). Bayero Journal of Pure and Applied Sciences, 2, 9-11
- Ismail, R. A., Ramadhan, I., and Mustafa, A. (2005). Chinese Physics Letter, 22, 2977
- Liyanaarachchi, U. S., Fernando, C. A. N., Foo, K. L., Hashim, U., and Maza, M. (2015). Chinese Journal of Physics, 53, 040803-1-040803-17
- Hummers, W. S., and. Offeman, R. E. (1958). Journal of American Chemical Society, 80, 1339
- Zhang, Y., Tang, Z., Fu, X., and Xu, Y. (2010). ACS Nano, 4, 7303-7314
- Enhance Photocurrent of Cu/n-Cu2O/p-CuI Solid State Solar Cell Using Bamboo Activated Carbon (BAC) as Upper-Electrode
Abstract Views :226 |
PDF Views:2
Authors
N. W. P. S. Perera
1,
R. D. A. A. Rajapaksha
1,
C. A. N. Fernando
1,
S. A. Ariadurai
2,
M. V. W. Samarakody
3
Affiliations
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
2 Department of Textile and Apparel Technology, Open University of Sri Lanka, Nawala, Nugegoda, LK
3 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, IN
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
2 Department of Textile and Apparel Technology, Open University of Sri Lanka, Nawala, Nugegoda, LK
3 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, IN
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 6, No 2 (2016), Pagination: 1-4Abstract
Bamboo is a natural vegetable fibre originated from the tropical and sub-tropical countries. In this research, alkaline-bio scoured raw bamboo fibre powder was subjected to alkaline one step pyrolysis activation by using KOH. The bamboo carbon powder was fed into a tube furnace with a ramping rate of 10°C min-1 until the temperature reached at 360°C and dwell time 15 min for N2 atmosphere. Subsequently they were cooled to room temperature. A thin film of n-Cu2O was fabricated by boiling a well cleaned Copper sheet in a 5x10-3M CuSO4 solution inside an ultrasonic bath at 60°C for 50 min. There after thin layer of colloidal CuI was deposited on the n-Cu2O layer. BAC was placed on n-Cu2O/p-CuI and ITO conductive glass plate was placed to fabricate Cu/ Cu2O/BAC/ITO solid state photovoltaic cell. BAC acts as an upper electrode; separate photo generated charge carriers and enhanced photocurrent. Mean Particle size distribution curves, Absorption spectra, Photocurrent action spectra and time development of photocurrent were used from this study.Keywords
Bamboo Activated Carbon (BAC), N-cu2o, P-CUI, Thin Film Solid State Solar Cell.- Photocurrent Enhancement of Cu/p-CuSCN/n-Cu2O Quantum Dot (QD) Novel Solid State Photovoltaic Cell with Coconut Shell Activated Carbon (CAC) as the Upper Electrode
Abstract Views :196 |
PDF Views:2
Authors
Affiliations
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
2 Department of Biotechnology, Wayamba University of Sri Lanka, Makandura, LK
1 Nano-Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
2 Department of Biotechnology, Wayamba University of Sri Lanka, Makandura, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 6, No 2 (2016), Pagination: 20-22Abstract
p-CuSCN was sensitized by n-Cu2O quantum dots (QDs) to fabricate a new solid state photovoltaic cell. QDs of n-Cu2O were deposited by boiling Cu/p-CuSCN photoelectrodes in a 1M CuSO4 solution to form Cu2O QDs on p-CuSCN. Boiling periods controlled the n-Cu2O quantum dot size. Activated coconut shell charcoal (CAC) was introduced on top of the Cu2O as the upper electrode and finally ITO glass was placed on CAC to fabricate the device.Keywords
N-Cu2O, P-CuSCN, Quantum Dots.- Review:Chitosan Nanoparticles for Effective and Safe Drug Delivery:Potential Big Deal in Intellectual Property Business
Abstract Views :202 |
PDF Views:5
Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 1-9Abstract
According to the world drug report 2016 of United Nations Office on Drug and Crime, over 29 million people who use drugs are estimated to suffer from drug use disorders. It is estimated that 1 in 20 adults, or a quarter of a billion people between the ages of 15 and 64 years, used at least one drug in 2014. The estimated 207, 400 drug-related deaths in 2014 is corresponding to 43.5 deaths per million people aged 15-64. The number of drug-related deaths worldwide has also remained stable, although unacceptable and preventable.
The use of conventional antimicrobial agents against infections is always associated with problems such as the development of multiple drug resistance and adverse side effects. In addition, the inefficient traditional drug delivery system results in inadequate therapeutic index, low bio-availability of drugs, inefficient delivery of the drugs, causing systemic side effects, problems of poor uptake and destruction of drugs (when orally administered).
One of the most dynamic research areas in the field of nanotechnology is nano-medicine and target drug delivery is one of the highly specific medical interventions for prevention, diagnosis and treatment of diseases. Problems associated with conventional drug administration methods may potentially be overcome by these novel drug delivery methods. Researchers have been able to develop targeted and sustained drug delivery platforms harnessing unique physico-chemical properties of nano-particles. Advances in research on bio-compatible polymeric nano-particles have enabled more efficient and safer delivery of drugs with improved pharmacokinetics and pharmacodynamics with reduced side effects. Total market size of nanotechnology in drug delivery in 2021 is forecasted to be US$136 billion. Trends also suggest that the number of nanotechnology products and workers worldwide will double every 3 years, achieving a US$3 trillion market with six million workers by 2020. Chitosan nanoparticles seem to be the most promising comnanoparticle that can be used for developing multipurpose drug carrier platforms due to its biocompatibility, mucoadhesivity, non-toxicity and biodegradability.
Despite of potential benefits of nanoparticles in target drug delivery, there are certain engineered nanomaterials which can lead to unforeseen environmental, health and safety risks. Therefore, adequate attention is needed from the beginning in order to ensure sustainable nanotechnology. This review article is focused on frontier research, toxicity evidence and patent filing trends in applications of chitosan nanoparticles with an emphasis on target drug delivery.
Keywords
Biocompatible, Chitosan Nanoparticles, Hazards and Risks, Nanomedicine, Nanotechnology, Patents, Pharmacodynamics, Pharmacokinetics, Targeted Drug Delivery.References
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- Novel Solid State Solar Cell made from n-Cu2O Using One Step Pyrolysis Coconut Shell Powder Activated Carbon as Upper - Electrode
Abstract Views :195 |
PDF Views:4
Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 10-13Abstract
Coconut trees are distributed throughout many parts of the world, normally in the Asia-Pacific and South Asian region. It grows primarily in tropical and coastal areas. Activated carbon was prepared by one step pyrolysis by treating with 0.1 M KOH of scoured coconut shell ball billed micro particles at 364 °C heat rate of 10 cm-1 in the nitrogen atmosphere for 0.15 h then washed with HCl. Iodine number was determined to all dried activated carbon samples. Powder activated carbon was characterized with SEM and proximate analysis. The copper plate was fabricated by using a thin film of Cu2O which is formed by boiling (510-3 M) solution of copper sulphate for 60 min. After a solid state photo-voltaic cell Cu/n-Cu2O/CAC/ITO were produced have CAC acts as the upper electrode of the solid state solar cells. It was formed that n-Cu2O/CAC contact forme schottky barrier junction to separate photo generated charge carriers, forming a solid state photovoltaic device. UV Absorption spectra, FTIR spectra. V-I characteristics and photo-current development with time were used to compare photo-voltaic characteristics of solid state thin film solar cell from this work.Keywords
Ball Mill, Coconut Shell, One Step Pyrolysis, Thin Film Solar Cell.References
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- Binder-Free Locally Developed Activated Carbon Powder Based Electrode for Supercapacitor
Abstract Views :253 |
PDF Views:4
Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 14-19Abstract
Nowadays, new technologies try to generate more energy to satisfy the demand of electricity. Therefore, storage of generated energy is becoming a highly important task. It is well known that the supercapacitors and batteries play a major role in the field of energy storage. When considering those options for storage electricity, supercapacitors were able to replace most of the capabilities encompassed in batteries and conventional capacitors with high energy density and the power density. In this research article, fabricating a novel supercapacitor using local coconut shell charcoal was discussed. It was focused on improving its performances without using a binder compound while keeping the fabrication process simple and inexpensive. Activated carbon powder used to fabricate the supercapacitor in this research was made from local coconut shell charcoal which was activated using steam activation method. The electrodes were fabricated as an electrode slurry made of activated carbon powder mixed with potassium hydroxide (KOH). It is found that the highest specific capacitance could obtain from the supercapacitor was 137 F/g. Charge-discharge curve indicated a power density of 42.6 Wkg-1 and energy density of 14.58 Whkg-1 which was a remarkable improvement for a supercapacitor fabricated without a binder compound.Keywords
Activated Carbon Powder, Aqueous Electrolyte, Cyclic Voltammetry, Electrochemical Impedance, Supercapacitors.References
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- Characterization of Supercapacitor Fabricated from Beli Fruit (Aegle Marmelos) Shell Activated Carbon for the First Time
Abstract Views :277 |
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Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 20-25Abstract
We developed activated carbon from the Aegle marmelos fruit shell also known as Beli. Firstly, its carbonaceous process is done by a typical process. H3PO4 treatment was used to activate the carbonaceous material. Activated material is characterized by using Scanning Electron Microscope and Brunauer-Emmett-Teller (BET) specific surface areas. Calculated BET surface area of the fabricated supercapacitor is 517 m2/g. Electrochemical characterization was carried out through cyclic voltammetry, charge/discharge and electrochemical impedance spectro-scopy. Highest specific capacitance of 59 F/g and energy density of 8.19 kW/h for highest specific capacitance was obtained from the charge discharge curve. Obtained equivalent serial resistance is 0.414 Ω from equivalent circuit.Keywords
Activated Carbon, Beli Fruit Shell, Specific Capacitance, Supercapacitors.References
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- Eco-Friendly Chitosan Nanoparticles Cross Linked with Genipin:Basis to Develop Control Release Nanofertilizer
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Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 26-31Abstract
Synthesis of nanoparticles has become a matter of great interest in recent years due to their so many functional properties and applications in a variety of fields. Nano-particle mediated control release fertilizer is one of the applications which has potential to enhance plant growth and yield while minimizing serious environmental impacts due to excessive use of conventional bulk fertilizers. Nevertheless, many of the research work carried out in relation to synthesis of nanoparticles have used synthetic constituents which are being considered as harmful to the human health and environment. Investigations have also indicated that certain engineered nanomaterials can lead to unforeseen environmental, health and safety risks. The aim of the present study was to produce biodegradable and biocompatible nanoparticles in an eco-friendly manner originated from locally available raw materials and natural excipients addressing the said risks which will ultimately lead to development of eco-friendly nanofertilizers to release nutrients gradually in a controlled manner. Chitosan, a natural biocompatible and biodegradable polymer, was synthesized from chitin which was extracted from exoskeleton of black tiger shrimp (Penaeus monodon Linn). A natural cross linker, Genipin was extracted from tender fruit of Gardenia (Gardenia jasminoides Linn). Chitosan nanoparticles were synthesized using Genipin (Fig. 1) as the cross linking agent with ionotropic gelation method. Fourier transform infra-red (FTIR) spectroscopic analysis confirmed structure of the synthesized chitosan. Average size of the synthesized chitosan nanoparticles is 90 nm (Fig. 2) which can be tuned by controlling the pH, dose of the cross linker and chitosan concentration. Innovative and promising results of this study will pave pathway to achieve green nanopartciles.Keywords
Biocompatible, Biodegradable, Chitosan, Cross Linking, Genipin, Ionotropic Gelation, Natural Polymer.References
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- Enhance the Photocurrent of Cu/n-Cu2O Solid State Solar Cell Using Coconut Shell Activated Carbon (CAC) as Upper - Electrode
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Authors
Affiliations
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
1 Nano Technology Research Laboratory, Department of Electronics, Wayamba University of Sri Lanka, Kuliyapitiya, LK
Source
Journal of Scientific and Technical Research (Sharda University, Noida), Vol 7, No 1 (2017), Pagination: 32-35Abstract
Coconut shells are used for production of activated carbon. In this research, alkaline-bio scoured coconut shell powder was subjected to one step pyrolysis activation by using Phosphoric acid. The acid treated coconut shell particles were fed into a tube furnace with a heating rate of 10 °C min-1 until the temperature reached at 360 °C and dwell time 15 min in N2 atmosphere. Next, they were cooled into room temperature. A thin film of n-Cu2O was fabricated by immersing a well cleaned copper sheet in a 10-3 M HCl solution for 60 h. CAC was placed on Cu/n-Cu2O substrate and ITO conductive glass plate was placed to fabricate Cu/n-Cu2O/CAC/ITO solid state photovoltaic cell. Here, CAC acts as an upper electrode, separate photo-generated charge carriers and enhance photocurrent. BET surface area analysis, diffuse reflectance spectra, photocurrent action spectra, time development of photocurrent and SEM morphology were used to analyse the prepared samples.Keywords
Activated Carbon, BET, Coconut Shell, n-Cu2O.References
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