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International Journal of Nanoparticles最新文献

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Arrays of Ni nanotubes formed by an electroless deposition-template based approach: Preparation and characterisation 基于化学沉积模板的方法形成的镍纳米管阵列:制备和表征
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028734
M. Alhoshan, W. Smyrl
{"title":"Arrays of Ni nanotubes formed by an electroless deposition-template based approach: Preparation and characterisation","authors":"M. Alhoshan, W. Smyrl","doi":"10.1504/IJNP.2009.028734","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028734","url":null,"abstract":"Nanomaterials can be formed following a number of different routes. The methods employed depend on the desired properties and applications. One of the broadest and most important synthetic approaches for nanomaterials is based on templates. Templates provide a predetermined configuration or cast to guide the formation of nanomaterials with the desired morphology. After a material is formed, the template can be sacrificially removed, leaving behind the final product that replicates the morphology of the original template. Using the template-based approach, we incorporated electroless deposition of Ni with various templates, so that once the template is removed, the desired arrays are revealed. In contrast to the polycarbonate membranes, the arrays obtained from anodic aluminium oxide membranes offer several advantages such as highly ordered array, large number density of the tubes and high roughness factor. The approach is general and versatile, and provides excellent control over produced nanomaterials. In addition, the approach yields consistent nanomaterial with enhanced order.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"51-57"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028734","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769855","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: 1
Synthesis and characterisation of sea urchin-like nanostructures of ZnO on Si (100) Si(100)上海胆状ZnO纳米结构的合成与表征
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028743
K. Tripathi, M. Zulfequar, M. Husain, Z. Khan
{"title":"Synthesis and characterisation of sea urchin-like nanostructures of ZnO on Si (100)","authors":"K. Tripathi, M. Zulfequar, M. Husain, Z. Khan","doi":"10.1504/IJNP.2009.028743","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028743","url":null,"abstract":"Sea urchin-like nanostructures of ZnO were fabricated on Si (100) by simple oxidation of ZnO films at 600°C consisting of ZnO nanorods. ZnO nanorods having diameter of 40 nm to 80 nm and length of 3 μm to 4 μm as shown by scanning electron microscope (SEM). They are similar in shape with uniform diameter along its entire length with well faceted blunt ends. X-ray diffraction analysis showed that as-grown nanostructures were crystalline with wurtzite hexagonal structures having the major peak at (0002) plane in XRD spectra. UV visible analysis is being done and transmittance data is used for calculating the energy band gap of the grown films. A model for vapour solid (VS) mechanism of ZnO nanorods was presented, in which nucleation of ZnO is crucial for the growth of nanostructures.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"111-118"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028743","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770037","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: 1
Highly crystalline ZnO nanoparticles 高结晶ZnO纳米颗粒
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028731
S. Habib
{"title":"Highly crystalline ZnO nanoparticles","authors":"S. Habib","doi":"10.1504/IJNP.2009.028731","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028731","url":null,"abstract":"Highly crystalline, defect free ZnO nanoparticles have been synthesised by the chemical co-precipitation technique. The product sample was characterised by the X-ray diffraction (XRD) and UV-visible absorption spectra. Analysis shows that there is no indication for oxygen vacancies in the as-prepared ZnO nanomaterials. Normally, a green absorption broad band at around 520 nm is observed in the absorption spectrum of ZnO due to oxygen vacancy. This defect is not observed in the present nanomaterial. The shape and size of the prepared nanoparticles were also observed by transmission electron microscope (TEM). The nanoparticles are of semispherical shape having average particle size ∼30 nm. The effect of sonicating time on the morphology of the prepared nanoparticles is also studied. Increasing the sonicating time provides quite spherical well-separated nanoparticles. These remarkable results for producing highly crystalline ZnO nanoparticles with a uniform shapes are quite useful for using them in several applications such as UV light emitting devices and biosensors.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"30-38"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028731","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769802","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: 1
Electrical transport in Ni-catalysed multi-walled carbon nanotubes 镍催化多壁碳纳米管的电传输
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028746
Z. Khan, N. Salah, S. Habib
{"title":"Electrical transport in Ni-catalysed multi-walled carbon nanotubes","authors":"Z. Khan, N. Salah, S. Habib","doi":"10.1504/IJNP.2009.028746","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028746","url":null,"abstract":"Low pressure chemical deposition method (LPCVD) is used to synthesise the Ni-catalysed carbon nanotubes (CNTs). These CNTs are grown on supported catalyst film of Ni nanoparticles by the catalytic decomposition of acetylene at 700°C and at a chamber pressure of 10 Torr. We have used field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) to study the morphology of the catalyst film of Ni as well as the CNTs. The standard four probe method is used for electrical transport measurements of these multi-walled carbon nanotubes (MWNTs) over the temperature range of 200-4.2 K. From these results, it is found that the variable range hopping (VRH) is responsible for the transport of carriers over the entire temperature range of 200-4.2 K. For the temperature range (200-100 K), three-dimensional VRH is suggested, while two-dimensional VRH is observed for the temperature range (100-4.2 K).","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"138-147"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028746","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770106","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
Physico chemical studies for the formation of nanosize silver particles 纳米银粒子形成的物理化学研究
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028732
S. Al‐Thabaiti, E. El-Mossalamy, F. M. Al-Nowaiser, Z. Khan
{"title":"Physico chemical studies for the formation of nanosize silver particles","authors":"S. Al‐Thabaiti, E. El-Mossalamy, F. M. Al-Nowaiser, Z. Khan","doi":"10.1504/IJNP.2009.028732","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028732","url":null,"abstract":"Transmission electron microscopic and kinetic data for the formation of surfactant stabilised growing microelectrode nanosize silver particles during the reduction of silver nitrate by ascorbic acid in the presence of ionic and non-ionic surfactants are reported for the first time. Upon mixing ascorbic acid to a solution of silver nitrate and cationic and/or anionic surfactants (cetyltrimethylammonium bromide and sodium dodecylsulphate), a readily distinguishable yellow colour appears, which is stable for several weeks. The plots of maximum wavelength absorbance versus time clearly indicate that the silver particles formation has an induction period followed by auto acceleration (sigmoid behaviour). The extent of induction period depends on the experimental conditions. The reaction follows zero-order kinetics with respect to (ascorbic acid) for nanosize silver particles formation.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"39-45"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028732","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769814","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: 1
Photoluminescence characterisation of Zn1–xCdxAl2O4:Eu nanophosphor for solid state lighting 固态照明用Zn1-xCdxAl2O4:Eu纳米荧光粉的光致发光特性
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028739
M. Khokhar, A. Deshmukh, D. R. Peshwe, S. Dhoble, R. S. Kher
{"title":"Photoluminescence characterisation of Zn1–xCdxAl2O4:Eu nanophosphor for solid state lighting","authors":"M. Khokhar, A. Deshmukh, D. R. Peshwe, S. Dhoble, R. S. Kher","doi":"10.1504/IJNP.2009.028739","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028739","url":null,"abstract":"All the phosphor are prepared as Zn1-x-yCdxAl2O4:Euy by combustion method. The formation of crystalline aluminates was confirmed by X-ray diffraction. The prepared phosphor was characterised by SEM, EDS, particle size analyser and photoluminescence (PL) techniques. The PL emission spectra of Zn1-x-yCdxAl2O4:Euy phosphor shows prominent peaks at 613 nm and 580 nm (excited by 394 nm wavelengths). It is also observed that the Eu ions are incorporated in trivalent form. The Eu ion concentration is kept constant at 0.5 mol% and Cd concentration varies from 0.1 mol% to 1 mol% in the host lattice. The increase in concentration of Cd ions increases the PL emission intensity. So it is clear that the replacement of Zn ion into Cd ions increased the crystallinity, hence, increases the PL intensity. The SEM and particle size analyser results indicate that the prepared phosphor are in nanosize and increase in concentration of Cd ions increases the particle size of phosphor.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"74-80"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028739","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769930","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: 3
Modification of surface and catalytic properties of Cu nanostructure catalysts used in methanol synthesis and steam reforming 甲醇合成和蒸汽重整用Cu纳米结构催化剂的表面改性及催化性能研究
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028748
M. Mokhtar, S. Basahel, Shaeel A. Al Thabaiti
{"title":"Modification of surface and catalytic properties of Cu nanostructure catalysts used in methanol synthesis and steam reforming","authors":"M. Mokhtar, S. Basahel, Shaeel A. Al Thabaiti","doi":"10.1504/IJNP.2009.028748","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028748","url":null,"abstract":"A series of CuO/ZnO/Al2O3 nanocrystalline solid catalysts were prepared by the coprecipitation method at constant temperature. The effect of the change in pH, chemical composition and thermal treatment for all the prepared solids on the physicochemical, surface and catalytic properties was investigated. The crystal structure of the different prepared solids was studied using XRD analysis. The crystallite size calculated from XRD patterns using Scherer equation did not alter effectively by changing the pH of the prepared catalyst precursors. The surface characteristics of various calcined adsorbents were investigated using nitrogen adsorption at –196°C and their catalytic activities were determined using water-gas shift reaction (WGSR) at temperature range between 130°C and 300°C. Only CuO and ZnO were identified for the solids calcined at 350°C. The catalyst with Cu/Zn = 1 and prepared at pH = 7 showed the smallest crystallite size (20 nm) and biggest surface area (SBET = 98m2/g). During the catalytic test relatively high conversion of CO into CO2 at a temperature = 150°C was observed (96%) for the previous catalyst.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"156-163"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028748","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770164","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
Kinetics of the reduction of fullgrown microelectrode silver particles by thiourea 硫脲还原成熟微电极银粒子的动力学研究
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028737
Z. Zaheer
{"title":"Kinetics of the reduction of fullgrown microelectrode silver particles by thiourea","authors":"Z. Zaheer","doi":"10.1504/IJNP.2009.028737","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028737","url":null,"abstract":"Kinetics of the title reaction (silver nano particles + thiourea) has been studied spectrophotometrically at 425 nm in presence of cationic and anionic micelles of cetyltrimethylammonium bromide and sodiumdodecyl sulphate, respectively. Silver nano size particles (yellow colour) were prepared by the reduction of silver nitrate with ascorbic acid in neutral aqueous media at 25°C. Various experiments were made to confirm the nature of yellow colour. Nano particles were found to be spherical in shape. The reaction proceeds through the fast adsorption of thiourea on the surface of the full grown microelectrode silver nano particles (FGME). The first-order kinetics shifts to zero-order at higher [thiourea].The observed results are discussed in terms of Langmuir-Hinshelwood kinetic model. Based on experimental results, a suitable mechanism has been proposed for the reduction of FGME silver nano particles.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"244-250"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028737","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66769909","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
Preparation, characterisation and optical properties of zinc oxide nanoparticles obtained by new intercalation chemical route 新型化学插层法制备氧化锌纳米粒子的制备、表征及光学性质
International Journal of Nanoparticles Pub Date : 2009-10-01 DOI: 10.1504/IJNP.2009.028742
A. A. Al-Ghamdi, S. Al-Heniti, E. El-Mossalamy, Manae Al-Assiri, H. Al-Gharni, A. Al-Hajry, N. A. Aal, F. El-Tantawy
{"title":"Preparation, characterisation and optical properties of zinc oxide nanoparticles obtained by new intercalation chemical route","authors":"A. A. Al-Ghamdi, S. Al-Heniti, E. El-Mossalamy, Manae Al-Assiri, H. Al-Gharni, A. Al-Hajry, N. A. Aal, F. El-Tantawy","doi":"10.1504/IJNP.2009.028742","DOIUrl":"https://doi.org/10.1504/IJNP.2009.028742","url":null,"abstract":"A new simple intercalation chemical route was used to synthesise ZnO nanoparticles via ZnO, sodium doclecyl sulfate as a surfactant and hydrogen peroxide at 90°C with strong stirring for five hours. The results of X-ray diffraction (XRD) and Fourier transformer infrared spectroscopy (FTIR) show that ZnO nanoparticles are all of crystalline hexagonal zincite phase. The results of scanning electron microscopy (SEM) and XRD indicate that the mean sizes of ZnO nanoparticles is about 25 nm. The thermal gravimetry reveals that the as-prepared ZnO has good thermal stability. Compared with other synthesis approaches, the proposed method can get fairly good product with a relatively low cost. The optical band gap energy of ZnO was 3.17 eV.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"2 1","pages":"100-110"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2009.028742","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770028","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
Shear strain induced formation of nanostructured pure metals 剪切应变诱导纳米结构纯金属的形成
International Journal of Nanoparticles Pub Date : 2009-06-17 DOI: 10.1504/IJNP.2008.026470
M. Jackson, J. Morrell, W. Ahmed
{"title":"Shear strain induced formation of nanostructured pure metals","authors":"M. Jackson, J. Morrell, W. Ahmed","doi":"10.1504/IJNP.2008.026470","DOIUrl":"https://doi.org/10.1504/IJNP.2008.026470","url":null,"abstract":"Chip formation is of fundamental importance during the formation of nanostructured pure metals. Poor chip control leads to chip build-up and an uncontrollable surface roughness. The use of chip breaking is arbitrary because of the mechanics of chip curl is not well understood. The causes of chip curl and chip flow are still the subject of intense discussion and research among plasticity researchers. The subject originally focused on cutting forces and on the conditions at the chip-tool interface using soft plastic metals. The increasing speed of cutting has focused researchers to look at chip breaking after the chip has been cut. In the first instance, chips were considered to be continuous, discontinuous and continuous with a built-up edge. The theories of metal cutting allow one to predict the forces and stresses in the chip during formation but do not tell us anything about the strain within the chip, unless a computational approach is used. This paper describes the mechanics of chip formation using the grinding process at the microscale and explains how the deformation of the grinding grains affects shear strain rates and the average grain size in the cut chip.","PeriodicalId":14016,"journal":{"name":"International Journal of Nanoparticles","volume":"1 1","pages":"271-282"},"PeriodicalIF":0.0,"publicationDate":"2009-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJNP.2008.026470","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66770083","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
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