Journal of Modern Materials最新文献_第2页

Study of the Optical, Electrical, Structural and Morphological Properties of Electrodeposited Lead Manganese Sulphide (PbMnS) Thin Film Semiconductors for Possible Device Applications 电沉积硫化铅锰薄膜半导体的光学、电学、结构和形态学研究

Journal of Modern Materials Pub Date : 2021-12-04 DOI: 10.21467/jmm.8.1.40-51

Augustine Nwode Nwori, Nnaedozie Laz Ezenwaka, Ifenyinwa Euphemia Ottih, N. Okereke, N. L. Okoli

{"title":"Study of the Optical, Electrical, Structural and Morphological Properties of Electrodeposited Lead Manganese Sulphide (PbMnS) Thin Film Semiconductors for Possible Device Applications","authors":"Augustine Nwode Nwori, Nnaedozie Laz Ezenwaka, Ifenyinwa Euphemia Ottih, N. Okereke, N. L. Okoli","doi":"10.21467/jmm.8.1.40-51","DOIUrl":"https://doi.org/10.21467/jmm.8.1.40-51","url":null,"abstract":"Semiconductor thin films of lead manganese sulphide (PbMnS) have been successfully deposited on florinated tin oxide (FTO) conductive glass substrate using an electrodeposition method. Lead acetate (Pb(CH3COO)2), manganese sulphate (MnSO4.H2O) and thiourea (CH4N2S) were the precursor used for cadmium (Cd2+), manganese (Mn2+) and sulphur (S2-) sources respectively. The concentration of manganese (Mn2+) was varied while keeping the concentrations of Pb2+ and S2- constant at 0.2 M and 0.1 M respectively. The deposited films were annealed at temperature of 250 oC and subjected for optical, electrical, structural and morphological characterizations. The results of the characterizations showed that the deposited thin films of PbMnS have high absorbance, high absorption coefficient throughout VIS and NIR regions. The band gap energy of the films is tuned to the order of 1.9 eV to 2.0 eV and tends to constant as concentration of Mn2+ increased. The electrical properties (electrical resistivity and conductivity) of the films are dependent on the concentration of Mn2+ and film thickness. The range of values of the electrical properties is found to be within the range of values for semiconductor materials. The XRD analysis revealed that the deposited thin films of PbMnS is crystalline but the crystallinity declined with increase in concentration of Mn2+. The SEM morphology showed that the surfaces of the films are highly homogeneous in nature and particle sizes are uniform on the substrate with the majority of the particles been spherical in shape. These observed properties exhibited by the deposited thin films of PbMnS make the films good materials for many optoelectronic and electronic applications such as solar cell, light emitting diode (LED), photodetector etc.","PeriodicalId":370184,"journal":{"name":"Journal of Modern Materials","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115193138","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}

引用次数: 0

Investigation of Failure Criteria and Experimental Process of the Composite Specimen with Mechanical Joints under Tensile Loading 拉伸载荷作用下带机械接头复合材料试样破坏准则及试验过程研究

Journal of Modern Materials Pub Date : 2020-12-14 DOI: 10.21467/jmm.7.1.54-67

P. Fathi, Amin Moslemi Petrudi

引用次数: 0

Pulsed Laser Annealing Effect on Optical and Structural Properties of ZnS/ZnSe Heterostructures 脉冲激光退火对ZnS/ZnSe异质结构光学和结构性能的影响

Journal of Modern Materials Pub Date : 2019-10-29 DOI: 10.21467/jmm.6.1.23-29

H. Howari

引用次数: 1

Analysis of Solar PV Energy Systems for Rural Villages of Nekemte Area, Oromiya Region, Ethiopia 埃塞俄比亚奥罗米亚地区Nekemte地区农村太阳能光伏能源系统分析

Journal of Modern Materials Pub Date : 2019-09-28 DOI: 10.21467/jmm.6.1.13-22

Tegenu Argaw Woldegiyorgis

{"title":"Analysis of Solar PV Energy Systems for Rural Villages of Nekemte Area, Oromiya Region, Ethiopia","authors":"Tegenu Argaw Woldegiyorgis","doi":"10.21467/jmm.6.1.13-22","DOIUrl":"https://doi.org/10.21467/jmm.6.1.13-22","url":null,"abstract":"Currently, the main energy source used in rural areas of Ethiopia for cooking and heating is unprocessed biomass and fossil fuel such as kerosene, paraffin and petrol/diesel. These energy sources generate large volume of indoor air pollution that increases the risk of chronic diseases. Solar energy is the most practical and economical way of bringing power to poor and remote communities in the long-term and Ethiopia is strategically located in a maximum sun shines hours zone. This study assessed the potential of a solar PV power system to provide the required electricity for a rural community near Nekemte city in Oromiya regions of Ethiopia. The sunshine hour’s data was obtained from the National Meteorological Service Agency (NMA). Results showed an abundant (average) solar energy potential of 5.52 KWh/m2/day. Electric load for a single household, school and clinic was estimated at 313, 2064 and 2040 Wh/day respectively. The cost of energy from solar PV system was estimated at about $1.2/kWh, $0.92/kWh and $0.87/KWh for household, school and clinic respectively. The findings encourage the use of the PV systems to electrify the remote sites of Ethiopia considering it long-term benefits and less cost of installation compared to national grid extension to the remote sites.","PeriodicalId":370184,"journal":{"name":"Journal of Modern Materials","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132697203","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}

引用次数: 6

Investigating the Utilization of Ground Palm Kernel Shells for Partial Replacement of Cement in Concrete Using Nondestructive Method 利用棕榈仁壳对混凝土中部分水泥进行无损替代的研究

Journal of Modern Materials Pub Date : 2019-07-13 DOI: 10.21467/JMM.6.1.1-12

E. Armah, Hubert Azoda Koffi, Bright J. A. Y Sogbey, Josef K Ametefe Amuzu

{"title":"Investigating the Utilization of Ground Palm Kernel Shells for Partial Replacement of Cement in Concrete Using Nondestructive Method","authors":"E. Armah, Hubert Azoda Koffi, Bright J. A. Y Sogbey, Josef K Ametefe Amuzu","doi":"10.21467/JMM.6.1.1-12","DOIUrl":"https://doi.org/10.21467/JMM.6.1.1-12","url":null,"abstract":"The objective of this research is to investigate the utilization of palm kernel shells in ground form (GPK) for partial replacement of ordinary Portland cement (OPC) in concrete by investigating its optimal strength using nondestructive ultrasonic pulse velocity method for both cubic and cylindrical concrete test specimen. In all a total of 135 cubes and 66 cylinders of concrete were prepared. The dimension of the cubic concrete specimens was 150 × 150 × 150 mm and that of the cylindrical specimens were 110 mm and 500 mm diameter and length respectively. The mix design of the GPK shells used as a partial replacement for OPC ranged between 0% and 50% by weight of cement using mix ratio of 1:2:4 with water to cement ratio of 0.8. The concrete specimens were test at curing periods of 7 days, 28 days and 60 days for the cubes and 7 days and 28 days for the cylinders. Based on the results and the analysis done, it was generally observed in all cases that, as the mix ratio is increased, the ultrasonic pulse velocity, modulus of elasticity and the density decreased and as the curing period increased, these values increased across all the mix ratios. The ultrasonic pulse velocity and the density of the specimens shows that concretes containing GPK “fuel” shells has higher values than those containing GPK ordinary shells. Generally, the density, ultrasonic pulse velocity and the modulus of elasticity of concrete containing GPK shells decrease as the replacement percentage increase.","PeriodicalId":370184,"journal":{"name":"Journal of Modern Materials","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124877255","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}

引用次数: 0

Epitaxial Lattice Matching and the Growth Techniques of Compound Semiconductors for their Potential Photovoltaic Applications 外延点阵匹配和化合物半导体的生长技术及其潜在的光伏应用

Journal of Modern Materials Pub Date : 2018-06-04 DOI: 10.21467/jmm.5.1.34-42

S. Husain, M.T. Hasan

引用次数: 2