Ping Xiao

Robert Dorey

Nanostructured Thin Films and Coatings

The structural, optical, and conductivity properties of silicon film deposited on cerium dioxide buffer layer were studied. The electronic structure of system consists of various defect levels inside band gap. The temperature spatial distribution plays a great role in silicon crystallization. The field destruction of crystal phase and its restoration, after annealing, were investigated.

Dmitry E. Milovzorov

Field Effect on Crystal Phase of Silicon in Si/<svg style="vertical-align:-3.27605pt" height="15.5125" version="1.1" viewBox="0 0 37.9375 15.5125" width="37.9375" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,11.363)"><path id="x43" d="M614 175l29 -10q-33 -109 -57 -154q-121 -26 -184 -26q-90 0 -160.5 29t-112.5 77t-63.5 105.5t-21.5 119.5q0 157 108 253t277 96q36 0 71.5 -5t69 -13.5t36.5 -8.5q15 -102 20 -150l-29 -8q-20 79 -66.5 114t-128.5 35q-119 0 -187.5 -86t-68.5 -207&#xA;q0 -140 73.5 -227.5t188.5 -87.5q73 0 119.5 37.5t86.5 116.5z"/></g><g transform="matrix(.017,-0,0,-.017,11.605,11.363)"><path id="x65" d="M380 106l15 -22q-42 -52 -87 -74t-76 -22q-89 0 -142 62t-53 151q0 103 66 175q67 73 146 73h1q61 0 105.5 -46.5t44.5 -105.5q0 -16 -4.5 -22.5t-18.5 -9.5q-54 -10 -262 -17q1 -95 46 -143.5t104 -48.5q61 0 115 50zM225 412q-35 0 -64.5 -32.5t-40.5 -90.5q83 0 170 3&#xA;q14 0 19 4.5t5 15.5q1 41 -23.5 70.5t-65.5 29.5z"/></g><g transform="matrix(.017,-0,0,-.017,18.829,11.363)"><path id="x4F" d="M381 665q131 0 226.5 -93t95.5 -239q0 -158 -96 -253t-238 -95q-137 0 -231 95t-94 238q0 142 92.5 244.5t244.5 102.5zM359 629q-89 0 -151 -74.5t-62 -208.5q0 -141 69 -233t175 -92q90 0 150.5 74t60.5 211q0 152 -69 237.5t-173 85.5z"/></g><g transform="matrix(.012,-0,0,-.012,31.55,15.45)"><path id="x32" d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z"/></g></svg>/<svg style="vertical-align:-3.27605pt" height="15.5125" version="1.1" viewBox="0 0 31.6625 15.5125" width="31.6625" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,11.363)"><path id="x53" d="M409 504l-29 -5q-16 60 -44.5 96t-86.5 36q-54 0 -82.5 -32t-28.5 -77q0 -51 30.5 -82.5t96.5 -65.5l35.5 -18t33 -19.5t33.5 -23.5l27 -25.5t24.5 -32t13.5 -36.5t6 -45q0 -80 -62 -134.5t-160 -54.5q-47 0 -98 15q-22 7 -50 21q-8 23 -27 155l30 7q7 -27 18 -52&#xA;t30 -51.5t49 -42.5t67 -16q56 0 88 32.5t32 87.5q0 51 -31.5 82t-98.5 67q-80 44 -110 73q-55 53 -55 124q0 75 56 126.5t150 51.5q53 0 126 -23z"/></g><g transform="matrix(.017,-0,0,-.017,8.018,11.363)"><path id="x69" d="M135 536q-20 0 -35 15.5t-15 35.5q0 22 15 37t36 15t35.5 -15t14.5 -37q0 -21 -15 -36t-36 -15zM252 0h-220v26q48 5 59 17t11 63v206q0 47 -9 58t-54 18v24q78 12 142 39v-345q0 -51 11.5 -63t59.5 -17v-26z"/></g><g transform="matrix(.017,-0,0,-.017,12.574,11.363)"><use xlink:href="#x4F"/></g><g transform="matrix(.012,-0,0,-.012,25.275,15.45)"><use xlink:href="#x32"/></g></svg> Structure

The thermomechanical stresses acting between a nanotube and fullerenes encapsulated on
                   it are computed. After a general formulation, based on elasticity, we have applied the analysis to C82<svg style="vertical-align:-0.17555pt;width:55.612499px;" id="M1" height="10.9125" version="1.1" viewBox="0 0 55.612499 10.9125" width="55.612499"  xmlns="http://www.w3.org/2000/svg">
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				<tspan style="font-size: 12.50px; " x="38.134151" y="0">0</tspan>
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</svg>(10,10) or C60<svg style="vertical-align:-0.17555pt;width:55.612499px;" id="M2" height="10.9125" version="1.1" viewBox="0 0 55.612499 10.9125" width="55.612499"  xmlns="http://www.w3.org/2000/svg">
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				<tspan style="font-size: 12.50px; " x="19.37965" y="0">0</tspan>
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				<tspan style="font-size: 12.50px; " x="38.134151" y="0">0</tspan>
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		</g>
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</svg>(10,10) peapods finding stresses in the gigapascal range or vanishing, respectively. The analysis suggests that a thermal control could be used to produce smart 
fullerenes at nanotube systems, for example, as two-stage nanovectors for drug delivery.

Nicola M. Pugno

Thermomechanical Stresses in Fullerenes at  Nanotube

Chromium metal-induced nanocrystallization of amorphous silicon (a-Si) thin films is reported.  The nanocrystalline nature of these films is confirmed from X-ray diffraction and Raman spectroscopy. Significantly, the deconvolution of Raman spectra reveals that the thin films were crystallized in a mixed phase of cubic diamond and wurzite structure as evidenced by the lines at 512 and 496&#x2009;<svg     style="vertical-align:-0.16379pt;width:34.549999px;" id="M1" height="16.049999" version="1.1" viewBox="0 0 34.549999 16.049999" width="34.549999"  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
	
		
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			<g transform="matrix(.012,-0,0,-.012,21.175,7.613)"><path id="x2212" d="M535 230h-483v50h483v-50z" /></g><g transform="matrix(.012,-0,0,-.012,28.16,7.613)"><path id="x31" d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" /></g>

		
	
</svg>, respectively. The crystallite sizes were between 4 to 8&#x2009;nm. Optical properties of the crystallized silicon, derived from spectral transmittance curves, revealed high transmission in the region above the band gap. Optical band gap varied between 1.3 to 2.0&#x2009;eV depending on the nature of crystallinity of these films and remained unaltered with increase in Cr addition from 5 to 30&#x25;. This signifies that the electronic structure of the nanocrystalline Silicon films is not affected considerably inspite of the presence of metal silicides and the process of crystallization.

K. Uma Mahendra Kumar

M. Ghanashyam Krishna

Chromium-Induced Nanocrystallization of a-Si Thin Films into the Wurtzite Structure

Titanium dioxide is a very useful photocatalyst for the decomposition and diminution of environmental water and air pollutants. In such applications, it can be used as slurry or as immobilized coating obtained by different deposition methods. The studies performed in the last years showed that thermal spraying could be employed to elaborate TiO<sub>2</sub> coatings with high performance for the decomposition of organic compounds. This manuscript presents a comparative study on the microstructure and photocatalytic performance of titania coatings obtained by different thermal spray techniques: atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and high-velocity oxygen fuel spray process (HVOF). Different titania powders and suspensions were used to study the influence of the feedstock materials on the coating characteristics. The deposits were mainly characterised by SEM and X-ray diffraction. The photocatalytic performance was evaluated from the removal of nitrogen oxides. The experimental results showed that a drastic reduction of the pollutant concentration was obtained in presence of coatings elaborated by suspension plasma spraying. TiO<sub>2</sub> coatings resulting from the spraying of agglomerated powder presentd less efficiency. That was mainly explained by the significant phase transformation from anatase to rutile that occurred in the enthalpic source during the spray processes.

Filofteia-Laura Toma

Ghislaine Bertrand

Didier Klein

Cathy Meunier

Sylvie Begin

Development of Photocatalytic Active TiO<sub>2</sub> Surfaces by Thermal Spraying of Nanopowders

Glass plate-supported nanostructure ZnO thin films were deposited by sol-gel spin coating. Films were preheated at <svg     style="vertical-align:-0.20473pt;width:40.950001px;" id="M1" height="13.1875" version="1.1" viewBox="0 0 40.950001 13.1875" width="40.950001"  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
    
        
            <g transform="matrix(.017,-0,0,-.017,.062,12.875)"><path id="x32" d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z" /></g><g transform="matrix(.017,-0,0,-.017,8.222,12.875)"><path id="x37" d="M447 623l8 -12l-283 -613l-74 -10l-7 11q174 283 297 551h-216q-48 0 -62.5 -12t-33.5 -63h-29q10 60 18 148h382z" /></g><g transform="matrix(.017,-0,0,-.017,16.381,12.875)"><path id="x35" d="M153 550l-26 -186q79 31 111 31q90 0 141.5 -51t51.5 -119q0 -93 -89 -166q-85 -69 -173 -71q-32 0 -61.5 11.5t-41.5 23.5q-18 17 -17 34q2 16 22 33q14 9 26 -1q61 -50 124 -50q60 0 93 43.5t33 104.5q0 69 -41.5 110t-121.5 41q-53 0 -102 -20l38 305h286l6 -8&#xA;l-26 -65h-233z" /></g>

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</svg> for 10&#x2009;minutes and annealed at 350, 450, and <svg     style="vertical-align:-0.20473pt;width:40.950001px;" id="M2" height="13.1875" version="1.1" viewBox="0 0 40.950001 13.1875" width="40.950001"  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
    
        
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            <g transform="matrix(.012,-0,0,-.012,24.538,4.712)"><use xlink:href="#x2218"/></g>

            <g transform="matrix(.017,-0,0,-.017,29.575,12.875)"><use xlink:href="#x43"/></g>

        
    
</svg> for 80&#x2009;minutes. The ZnO thin films were transparent ca 80&#x2013;90&#x25; in visible range and revealed that absorption edges at about 370&#x2009;nm. The <i  >c</i>-axis orientation improves and the grain size increases which was indicated by an increase in intensity of the (002) peak at <svg     style="vertical-align:-0.1638pt;width:33.512501px;" id="M3" height="13.1375" version="1.1" viewBox="0 0 33.512501 13.1375" width="33.512501"  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
    
        
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            <g transform="matrix(.012,-0,0,-.012,28.412,4.712)"><use xlink:href="#x2218"/></g>

        
    
</svg> in XRD corresponding to the hexagonal ZnO crystal. The photocatalytic degradation of X6G an anionic monoazo dye, in aqueous solutions, was investigated and the effects of some operational parameters such as the number of layer and reusability of ZnO nanostructure thin film were examined. The results showed that the five-layer coated glass surfaces have a very high photocatalytic performance.

Mohammad Hossein Habibi

Mohammad Khaledi Sardashti

Preparation of Glass Plate-Supported Nanostructure ZnO Thin Film Deposited by Sol-Gel Spin-Coating Technique and Its Photocatalytic Degradation to Monoazo Textile Dye

We present a study of the preparation and structural characterization of granular <mml:math id="E1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ag-ZrO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>, <mml:math id="E2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Co-ZrO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>, and <mml:math id="E3" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Au-ZrO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> thin films grown by pulsed laser deposition (PLD) in a wide range of volume fraction <i>x</i> of metal  (<mml:math id="E4" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0.08</mml:mn><mml:mo>&#x3c;</mml:mo><mml:msub><mml:mi>x</mml:mi><mml:mrow><mml:mtext>Ag</mml:mtext></mml:mrow></mml:msub><mml:mo>&#x3c;</mml:mo><mml:mn>0.28</mml:mn></mml:mrow></mml:math>, <mml:math id="E5" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0.06</mml:mn><mml:mo>&#x3c;</mml:mo><mml:msub><mml:mi>x</mml:mi><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow></mml:msub><mml:mo>&#x3c;</mml:mo><mml:mn>0.40</mml:mn></mml:mrow></mml:math>, and <mml:math id="E6" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0.08</mml:mn><mml:mo>&#x3c;</mml:mo><mml:msub><mml:mi>x</mml:mi><mml:mrow><mml:mtext>Au</mml:mtext></mml:mrow></mml:msub><mml:mo>&#x3c;</mml:mo><mml:mn>0.55</mml:mn></mml:mrow></mml:math>). High-resolution transmission electron microscopy (HRTEM) showed regular distribution of spherical Au, Co, and Au nanoparticles having very sharp interfaces with the amorphous matrix. The structural results are compared aiming to stress the effect of the actual microstructure on the percolation threshold. Two different mechanisms of particle growing as a function of the metal content are evidenced: nucleation and particle coalescence, with their relative significance depending strongly on the type of metal, giving rise to very different values of the percolation threshold (<mml:math id="E7" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>x</mml:mi><mml:mtext>c</mml:mtext></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mtext>Ag</mml:mtext><mml:mo stretchy="false">)</mml:mo><mml:mo>∼</mml:mo><mml:mn>0.28</mml:mn></mml:mrow></mml:math>, <mml:math id="E8" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>x</mml:mi><mml:mtext>c</mml:mtext></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mtext>Co</mml:mtext><mml:mo stretchy="false">)</mml:mo><mml:mo>∼</mml:mo><mml:mn>0.35</mml:mn></mml:mrow></mml:math>, and <mml:math id="E9" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>x</mml:mi><mml:mtext>c</mml:mtext></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mtext>Au</mml:mtext><mml:mo stretchy="false">)</mml:mo><mml:mo>∼</mml:mo><mml:mn>0.55</mml:mn></mml:mrow></mml:math>).

M. Garc&#xed;a del Muro

Z. Konstantinovic

M. Varela

X. Batlle

A. Labarta

Metallic Nanoparticles Embedded in a Dielectric Matrix: Growth Mechanisms and Percolation

Inorganic thin films (hydroxide, oxide, and phosphate materials) that are textured on a submicron scale have been prepared from aqueous metal salt solutions at room temperature using vapor-diffusion catalysis. This generic synthesis approach mimics the essential advantages of the catalytic and structure-directing mechanisms observed for the formation of silica skeletons of marine sponges. Chemical composition, crystallinity, and the three-dimensional morphology of films prepared by this method are extremely sensitive to changes in the synthesis conditions, such as concentrations, reaction times, and the presence and nature of substrate materials. Focusing on different materials systems, the reaction mechanism for the formation of these thin films and the influence of different reaction parameters on the product are explained.

Birgit Schwenzer

Daniel E. Morse

Biologically Inspired Synthesis Route to Three-Dimensionally Structured Inorganic Thin Films

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<p>Chief Editor Stefano Bellucci is Professor of Theoretical Physics at the National Institute for Nuclear Physics in Frascati, Italy. His research interests include&nbsp;nanoscience and nanotechnology, nanocarbon-based composites, and the biomedical applications of nanomaterials.</p>


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Journal of Nanomaterials

Nanostructured Thin Films and Coatings

Nanostructured Thin Films and Coatings

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