W. I. W. Y. Boteju, M. Gunarathna, T. L. M. D. Fonseka, H. Peiris, L. A. R. Silva, N. N. S. S. Jayathilaka, L. A. G. D. Jayasekara, P. Perera, H. Jayaweera, M. Gunewardene, S. Jayawardhana
{"title":"A quantitative approach to gemstone identification using Raman spectroscopy combined with machine learning","authors":"W. I. W. Y. Boteju, M. Gunarathna, T. L. M. D. Fonseka, H. Peiris, L. A. R. Silva, N. N. S. S. Jayathilaka, L. A. G. D. Jayasekara, P. Perera, H. Jayaweera, M. Gunewardene, S. Jayawardhana","doi":"10.4038/sljp.v23i1.8110","DOIUrl":"https://doi.org/10.4038/sljp.v23i1.8110","url":null,"abstract":"","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85788146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Methods of inducing magnetism into graphene monolayer","authors":"H. Peiris, W. W. P. De Silva","doi":"10.4038/sljp.v23i1.8118","DOIUrl":"https://doi.org/10.4038/sljp.v23i1.8118","url":null,"abstract":"","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82839140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. de Costa, R. D. De Silva, L. Nayanajith, H. Colombage, M. Milani, S. Rosa, I. Kottegoda
Electrochemical performance and material characterization of reduced grapheneoxide (rGO) / titanium dioxide (TiO2) composite as electrodes for supercapacitors M. D. R. De Costa 1, , R. C. L. De Silva, L. D. C. Nayanajith, H. C. D. P. Colombage, M. D. Y. Milani, S. R. D. Rosaand I. R. M. Kottegoda 1 Materials Technology Section, Industrial Technology Institute, Colombo 07, Sri Lanka. 2 Department of Physics, University of Colombo, Colombo 03, Sri Lanka. ____________________________________________________________________________
还原氧化石墨烯(rGO) /二氧化钛(TiO2)复合材料作为超级电容器电极的电化学性能和材料表征M. D. R. De Costa 1, R. C. L. De Silva, L. D. C. Nayanajith, H. C. D. P. Colombage, M. D. Y. Milani, S. R. D. Rosaand I. R. M. Kottegoda 1材料技术部，工业技术研究所，2007年，斯里兰卡。2科伦坡大学物理系，科伦坡03，斯里兰卡。____________________________________________________________________________
{"title":"Electrochemical performance and material characterization of reduced grapheneoxide (rGO) / titanium dioxide (TiO2) composite as electrodes for supercapacitors","authors":"M. de Costa, R. D. De Silva, L. Nayanajith, H. Colombage, M. Milani, S. Rosa, I. Kottegoda","doi":"10.4038/sljp.v22i2.8052","DOIUrl":"https://doi.org/10.4038/sljp.v22i2.8052","url":null,"abstract":"Electrochemical performance and material characterization of reduced grapheneoxide (rGO) / titanium dioxide (TiO2) composite as electrodes for supercapacitors M. D. R. De Costa 1, , R. C. L. De Silva, L. D. C. Nayanajith, H. C. D. P. Colombage, M. D. Y. Milani, S. R. D. Rosaand I. R. M. Kottegoda 1 Materials Technology Section, Industrial Technology Institute, Colombo 07, Sri Lanka. 2 Department of Physics, University of Colombo, Colombo 03, Sri Lanka. ____________________________________________________________________________","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90397190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. G. N. Rajapaksha, K. Perera, K. Vidanapathirana
Electrolytes have been identified as one of the most influential components for the performance of electrochemical devices. In literature, there are several generations in the field of electrolytes and among them Solid Polymer Electrolytes (SPEs) have received a great interest. The first ever SPE has been introduced to the world around 1973. Thereafter, so many modifications have been done in order to uplift the characteristics of SPEs. In general, SPE is a blend of a polymer, a salt and solvent/s. With respect to SPEs, there are some special features of interest encompassing ionic conductivity, transference number etc. Various characterization techniques are being practiced to evaluate those properties and some of them are Electrochemical Impedance Spectroscopy (EIS), Cyclic voltammetry (CV) test, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Looking back at the past as well as the present day of SPEs, it can envisage that they will appear in future with a huge number of reforms.
{"title":"Solid polymer electrolytes as a prospective class of electrolytes","authors":"H. G. N. Rajapaksha, K. Perera, K. Vidanapathirana","doi":"10.4038/sljp.v22i2.8103","DOIUrl":"https://doi.org/10.4038/sljp.v22i2.8103","url":null,"abstract":"Electrolytes have been identified as one of the most influential components for the performance of electrochemical devices. In literature, there are several generations in the field of electrolytes and among them Solid Polymer Electrolytes (SPEs) have received a great interest. The first ever SPE has been introduced to the world around 1973. Thereafter, so many modifications have been done in order to uplift the characteristics of SPEs. In general, SPE is a blend of a polymer, a salt and solvent/s. With respect to SPEs, there are some special features of interest encompassing ionic conductivity, transference number etc. Various characterization techniques are being practiced to evaluate those properties and some of them are Electrochemical Impedance Spectroscopy (EIS), Cyclic voltammetry (CV) test, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Looking back at the past as well as the present day of SPEs, it can envisage that they will appear in future with a huge number of reforms.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"226 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76619454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Wanigasekara, D. Namawardana, W. Wanninayake, K. Jayathilaka, R. P. Wijesundera, W. Siripala
Organic solar cells (OSCs) have gained much popularity among researchers as possible candidate for fulfilment of future energy requirements. Poly(3-hexylthiophene) (P3HT): Phenyl-C61-Butyric Acid Methyl Ester (PC61BM) based bulk heterojunction OSC is one of the most popular types. In this study, inverted P3HT:PCBM OSCs were fabricated on Stainless Steel (SS) substrate with and without ZnO layer in between the SS and active material. In fabrication of the device, ZnO and P3HT:PCBM layers were deposited using spin coating technique while poly-(4,3-ethylene dioxythiophene) (PEDOT): poly(styrenesulfonate) (PSS) layer was deposited using doctor blade method. Finally, gold (Au) front contact was sputter coated. In comparison with the best SS/P3HT:PCBM/PEDOT:PSS/Au device, we could fabricate a SS/ZnO/P3HT:PCBM/PEDOT:PSS/Au device with a 280% increase in power conversion efficiency (PCE). This PCE enhancement is due to the improvement of short wavelength response with the introduction of ZnO to the device.
{"title":"Fabrication of P3HT/PCBM inverted solar cells with ZnO electron transport layer","authors":"R. Wanigasekara, D. Namawardana, W. Wanninayake, K. Jayathilaka, R. P. Wijesundera, W. Siripala","doi":"10.4038/SLJP.V22I1.8092","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8092","url":null,"abstract":"Organic solar cells (OSCs) have gained much popularity among researchers as possible candidate for fulfilment of future energy requirements. Poly(3-hexylthiophene) (P3HT): Phenyl-C61-Butyric Acid Methyl Ester (PC61BM) based bulk heterojunction OSC is one of the most popular types. In this study, inverted P3HT:PCBM OSCs were fabricated on Stainless Steel (SS) substrate with and without ZnO layer in between the SS and active material. In fabrication of the device, ZnO and P3HT:PCBM layers were deposited using spin coating technique while poly-(4,3-ethylene dioxythiophene) (PEDOT): poly(styrenesulfonate) (PSS) layer was deposited using doctor blade method. Finally, gold (Au) front contact was sputter coated. In comparison with the best SS/P3HT:PCBM/PEDOT:PSS/Au device, we could fabricate a SS/ZnO/P3HT:PCBM/PEDOT:PSS/Au device with a 280% increase in power conversion efficiency (PCE). This PCE enhancement is due to the improvement of short wavelength response with the introduction of ZnO to the device.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81674872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Graphene, as a new emerging carbonaceous material has gained a lot of attention in the past decade due to its extraordinary intrinsic properties. Conducting polymers exhibit high potential in supercapacitors because of their advantages over other electrode materials including good conductivity, flexibility, ease of synthesis etc. But both materials have some drawbacks when they merely used as electrodes. Therefore, research community has move towards composite electrodes to avoid disadvantageous realities and accomplish the best performance. This review summarizes recent development of graphene and conducting polymer (Polypyrrole and Polyaniline) based composite electrodes for supercapacitors and the comparison of their performance.
{"title":"Conducting Polymer /Graphene composite electrodes for supercapacitors","authors":"D. S. K. Rajaguru, K. Vidanapathirana, K. Perera","doi":"10.4038/SLJP.V22I1.8078","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8078","url":null,"abstract":"Graphene, as a new emerging carbonaceous material has gained a lot of attention in the past decade due to its extraordinary intrinsic properties. Conducting polymers exhibit high potential in supercapacitors because of their advantages over other electrode materials including good conductivity, flexibility, ease of synthesis etc. But both materials have some drawbacks when they merely used as electrodes. Therefore, research community has move towards composite electrodes to avoid disadvantageous realities and accomplish the best performance. This review summarizes recent development of graphene and conducting polymer (Polypyrrole and Polyaniline) based composite electrodes for supercapacitors and the comparison of their performance.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87458544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. I. Sandamali, G. Senadeera, M. Dissanayake, T. Jaseetharan, V. Perera, J. Rajendra, N. Karthikeyan, Lahiru A. Wijenayaka
Use of surface plasmon resonance effect of the Ag nanoparticles (Ag NPs) towards the photophysical properties of CdS quantum dot sensitized TiO2 based solar cells (QDSSCs) was investigated under the illumination of 100 mW cm-2 (AM 1.5). Depositions of CdS on TiO2 electrodes were carried out by successive ionic layer adsorption and reaction (SILAR) method with optimized ten cycles. Current voltage characteristics of QDSSCs fabricated with optimum amount of Ag NPs (0.2 % w/v) in TiO2 showed ~ 26% increment in the power conversion efficiency from 1.09 to 1.37%. Surface morphological studies of photoanodes were carried out with scanning electron microscopy, high-resolution transition electron microscopy and energy dispersive X-ray measurements (EDX). The existence of spherical shape Ag nanoparticles in TiO2 with an average particle size of 35 nm was confirmed by EDX analysis. The estimated average size of the TiO2 and CdS particles appears to be around 40 nm and 4.2 nm respectively.
{"title":"The effect of surface plasmon resonance on the photovoltaic properties of CdS quantum dot sensitized solar cells","authors":"W. I. Sandamali, G. Senadeera, M. Dissanayake, T. Jaseetharan, V. Perera, J. Rajendra, N. Karthikeyan, Lahiru A. Wijenayaka","doi":"10.4038/SLJP.V22I1.8095","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8095","url":null,"abstract":"Use of surface plasmon resonance effect of the Ag nanoparticles (Ag NPs) towards the photophysical properties of CdS quantum dot sensitized TiO2 based solar cells (QDSSCs) was investigated under the illumination of 100 mW cm-2 (AM 1.5). Depositions of CdS on TiO2 electrodes were carried out by successive ionic layer adsorption and reaction (SILAR) method with optimized ten cycles. Current voltage characteristics of QDSSCs fabricated with optimum amount of Ag NPs (0.2 % w/v) in TiO2 showed ~ 26% increment in the power conversion efficiency from 1.09 to 1.37%. Surface morphological studies of photoanodes were carried out with scanning electron microscopy, high-resolution transition electron microscopy and energy dispersive X-ray measurements (EDX). The existence of spherical shape Ag nanoparticles in TiO2 with an average particle size of 35 nm was confirmed by EDX analysis. The estimated average size of the TiO2 and CdS particles appears to be around 40 nm and 4.2 nm respectively.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91193826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Sewwandi, A. R. Kumarasinghe, D. Tushara, H. D. W. M. A. M. Wijesingha, C. H. Manathunga, V. Perera, R. Weerasooriya
Graphitized carbon spheres (GCSs) with varied diameters (500 nm to 4.5μm) and hierarchical surface morphologies were successfully produced on iron-particles coated silicon (100) substrate at 750°C by chemical vapour deposition (CVD). By varying the mass flow rate of the precursor gasses and the method of catalyst coating on silicon (100), GCSs with varied diameters and differing morphologies were obtained. When the mass flow rate of the precursor gasses was altered, the mean diameter of GCSs increases until it reaches an optimum value (~3.1µm) suggesting a size-tunability of GCSs. Changing the catalyst coating method on silicon (100) from dip coating to spin coating produces larger-sized GCSs on silicon (100). Field Emission Scanning Electron Microscopy (FE-SEM) images show that GCSs possess a regular and uniform shape with the formation of a hierarchical surface morphology. The analysis of the variation of the surface roughness laterally across the substrate showed that the increased surface roughness resulting in from catalyst spin coating increases the mass transfer rates leading to the formation of larger-sized GCSs on Si (100). Raman spectroscopy and X-ray diffraction spectra obtained from the catalyst spin-coated and dip-coated samples confirmed the presence of graphitized hexagonal carbon networks in CSs. The surface functionality of GCSs was examined using FTIR spectroscopy. Synthesized GCSs were then used to fabricate an anode material in sodium ion rechargeable batteries and the performance of GCSs as an anode material in rechargeable battery system was investigated and the results obtained are also discussed here.
{"title":"Fabrication of size-tunable graphitized carbon spheres with hierarchical surface morphology on p-Si (100) by chemical vapour deposition","authors":"B. Sewwandi, A. R. Kumarasinghe, D. Tushara, H. D. W. M. A. M. Wijesingha, C. H. Manathunga, V. Perera, R. Weerasooriya","doi":"10.4038/SLJP.V22I1.8093","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8093","url":null,"abstract":"Graphitized carbon spheres (GCSs) with varied diameters (500 nm to 4.5μm) and hierarchical surface morphologies were successfully produced on iron-particles coated silicon (100) substrate at 750°C by chemical vapour deposition (CVD). By varying the mass flow rate of the precursor gasses and the method of catalyst coating on silicon (100), GCSs with varied diameters and differing morphologies were obtained. When the mass flow rate of the precursor gasses was altered, the mean diameter of GCSs increases until it reaches an optimum value (~3.1µm) suggesting a size-tunability of GCSs. Changing the catalyst coating method on silicon (100) from dip coating to spin coating produces larger-sized GCSs on silicon (100). Field Emission Scanning Electron Microscopy (FE-SEM) images show that GCSs possess a regular and uniform shape with the formation of a hierarchical surface morphology. The analysis of the variation of the surface roughness laterally across the substrate showed that the increased surface roughness resulting in from catalyst spin coating increases the mass transfer rates leading to the formation of larger-sized GCSs on Si (100). Raman spectroscopy and X-ray diffraction spectra obtained from the catalyst spin-coated and dip-coated samples confirmed the presence of graphitized hexagonal carbon networks in CSs. The surface functionality of GCSs was examined using FTIR spectroscopy. Synthesized GCSs were then used to fabricate an anode material in sodium ion rechargeable batteries and the performance of GCSs as an anode material in rechargeable battery system was investigated and the results obtained are also discussed here.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75830499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Senevirathne, G. Wickramasinghe, K. T. Hettiarachchi, V. Perera
Casein is the major protein present in cow’s milk. Lowering the pH of cow’s milk by addition of acids, natural casein can be precipitated, which can be utilized in fabricating thin film of polymer matrix for electrodes of optoelectronic devices. In the current study, casein was isolated by using several organic and inorganic acids. As organic acids, acetic, lactic, formic and ascorbic acids were used and H3PO4, H2SO4 and HNO3 were used as the inorganic acids. Thin films of casein were deposited on conducting tin oxide glass plates by using the casein precipitated with each acid and electrochemically characterized. But any significant difference could not be seen in the above measurements, where the same yield and results were obtained with all acids. Therefore, in further studies, casein isolated from acetic acid was used because of the safeness in using diluted acetic acid solution. These casein films were physically characterized by using impedance and optical spectroscopic techniques. Mott-Schottky analysis has shown that casein is having an n-type conductivity with flat band potential at - 0.61V. The impedance spectroscopic analysis was used to calculate the electrical conductivity and dielectric constant of casein which were found to be 1.13×10-2 mS/m and 6.6 respectively. The band gap of synthesized casein was determined by drawing tauc plot using the UV visible spectroscopic data which was found to be 3.9 eV. Fourier transform infrared spectra of casein sample were recoded to confirm the presence of functional groups in the synthesized compound. With this characterization, it was evident that casein is a prospective material to fabricate novel optoelectronic devices.
{"title":"Physical characterizations of casein by using electrochemical and spectroscopic techniques","authors":"T. Senevirathne, G. Wickramasinghe, K. T. Hettiarachchi, V. Perera","doi":"10.4038/SLJP.V22I1.8094","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8094","url":null,"abstract":"Casein is the major protein present in cow’s milk. Lowering the pH of cow’s milk by addition of acids, natural casein can be precipitated, which can be utilized in fabricating thin film of polymer matrix for electrodes of optoelectronic devices. In the current study, casein was isolated by using several organic and inorganic acids. As organic acids, acetic, lactic, formic and ascorbic acids were used and H3PO4, H2SO4 and HNO3 were used as the inorganic acids. Thin films of casein were deposited on conducting tin oxide glass plates by using the casein precipitated with each acid and electrochemically characterized. But any significant difference could not be seen in the above measurements, where the same yield and results were obtained with all acids. Therefore, in further studies, casein isolated from acetic acid was used because of the safeness in using diluted acetic acid solution. These casein films were physically characterized by using impedance and optical spectroscopic techniques. Mott-Schottky analysis has shown that casein is having an n-type conductivity with flat band potential at - 0.61V. The impedance spectroscopic analysis was used to calculate the electrical conductivity and dielectric constant of casein which were found to be 1.13×10-2 mS/m and 6.6 respectively. The band gap of synthesized casein was determined by drawing tauc plot using the UV visible spectroscopic data which was found to be 3.9 eV. Fourier transform infrared spectra of casein sample were recoded to confirm the presence of functional groups in the synthesized compound. With this characterization, it was evident that casein is a prospective material to fabricate novel optoelectronic devices.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"52 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77919440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Herath, G. Wickramasinghe, G. Aponsu, V. Perera
Dye extracted from flesh of Clove fruit (Syzgium aromaticum) was used as the sensitizer in Dye Sensitized Solar Cells (DSSCs) of the configuration TiO2/dye/electrolyte/Pt. Pigments of Clove fruit was extracted by soaking in distilled water and ethanol and again boiling in both the solutions. Since DSSCs made using dye extraction in ethanol produced higher efficiency than in water, glacial acetic acid was added to dye extractions in ethanol at different ratios to examine any further enhancements. The Clove fruit extract absorbed appreciable solar radiation in the wavelength range 500 - 700 nm that makes it suitable for a DSSC. FTIR spectra of the dye extracts revealed the hydroxyl groups attached to dye is prominent after acidification with acetic acid that helps to anchor on TiO2 surface. DSSC fabricated using mixture of fruit dye in ethanol and glacial acetic with the ratio of 1:3 produced the highest efficiency of 0.69 % with the photo current of 2.50 mAcm-2 and fill factor of 61.57 %. The electron life time calculated from bode phase plots of the cells also supported the above observations. The enhancement with acetic acid treatment of dye is attributed to intensification of absorption of visible light and strong coupling of the dye with TiO2 due to the presence of anchoring groups in acidic form is evidence from UV visible and FTIR spectroscopy.
{"title":"Effects of acidification of clove fruit dye extracted in water and ethanol for performance enhancement of DSSCs","authors":"D. Herath, G. Wickramasinghe, G. Aponsu, V. Perera","doi":"10.4038/SLJP.V22I1.8097","DOIUrl":"https://doi.org/10.4038/SLJP.V22I1.8097","url":null,"abstract":"Dye extracted from flesh of Clove fruit (Syzgium aromaticum) was used as the sensitizer in Dye Sensitized Solar Cells (DSSCs) of the configuration TiO2/dye/electrolyte/Pt. Pigments of Clove fruit was extracted by soaking in distilled water and ethanol and again boiling in both the solutions. Since DSSCs made using dye extraction in ethanol produced higher efficiency than in water, glacial acetic acid was added to dye extractions in ethanol at different ratios to examine any further enhancements. The Clove fruit extract absorbed appreciable solar radiation in the wavelength range 500 - 700 nm that makes it suitable for a DSSC. FTIR spectra of the dye extracts revealed the hydroxyl groups attached to dye is prominent after acidification with acetic acid that helps to anchor on TiO2 surface. DSSC fabricated using mixture of fruit dye in ethanol and glacial acetic with the ratio of 1:3 produced the highest efficiency of 0.69 % with the photo current of 2.50 mAcm-2 and fill factor of 61.57 %. The electron life time calculated from bode phase plots of the cells also supported the above observations. The enhancement with acetic acid treatment of dye is attributed to intensification of absorption of visible light and strong coupling of the dye with TiO2 due to the presence of anchoring groups in acidic form is evidence from UV visible and FTIR spectroscopy.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80564212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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