7 results
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2. Controlled synthesis of carbon nanocoils and carbon nanotubes on common paper substrates.
- Author
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Cui, Ruixue, Pan, Lujun, Li, Dawei, Ma, He, and Peng, Wei
- Subjects
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NANOSTRUCTURED materials synthesis , *CHEMICAL vapor deposition , *THERMAL analysis , *PAPER , *CALCIUM carbonate , *IRON compounds , *CARBON - Abstract
Abstract: The commercially available copy papers and pure papers have been adopted to synthesize carbon nanomaterials. It is found that carbon nanocoils (CNCs) are efficiently synthesized on the copy paper substrates using Fe2(SO4)3/SnCl2 catalyst by a thermal chemical vapor deposition method, while only carbon nanotubes (CNTs) are obtained on the pure paper substrate using the same process. It is evidenced that the particles of calcium carbonate existing in copy paper aggregate catalyst and adsorb more sulfur elements which promote the growth of CNCs. In addition, CNCs can successfully grow out from the pure paper by adding calcium carbonate. [Copyright &y& Elsevier]
- Published
- 2014
- Full Text
- View/download PDF
3. Oxidising and carburising catalyst conditioning for the controlled growth and transfer of large crystal monolayer hexagonal boron nitride
- Author
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Martin Otto, Vitaliy Babenko, Robert S. Weatherup, Ye Fan, Oliver J. Burton, Barbara Canto, Stephan Hofmann, Vlad-Petru Veigang-Radulescu, Jack A. Alexander-Webber, Barry Brennan, Daniel Neumaier, Andrew J. Pollard, Babenko, V [0000-0001-5372-6487], Brennan, B [0000-0002-5754-4100], Alexander-Webber, JA [0000-0002-9374-7423], Weatherup, RS [0000-0002-3993-9045], Canto, B [0000-0001-5885-9852], Neumaier, D [0000-0002-7394-9159], Hofmann, S [0000-0001-6375-1459], Apollo - University of Cambridge Repository, Babenko, Vitaliy [0000-0001-5372-6487], Fan, Ye [0000-0003-0998-5881], Burton, Oliver [0000-0002-2060-1714], Alexander-Webber, Jack [0000-0002-9374-7423], Weatherup, Robert [0000-0002-3993-9045], Hofmann, Stephan [0000-0001-6375-1459], Brennan, Barry [0000-0002-5754-4100], Alexander-Webber, Jack A [0000-0002-9374-7423], Weatherup, Robert S [0000-0002-3993-9045], Canto, Barbara [0000-0001-5885-9852], and Neumaier, Daniel [0000-0002-7394-9159]
- Subjects
Paper ,Materials science ,Fabrication ,Iron oxide ,FOS: Physical sciences ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,chemical vapor deposition ,chemistry.chemical_compound ,Impurity ,law ,Etching (microfabrication) ,monolayer ,Monolayer ,General Materials Science ,hexagonal boron nitride ,FOIL method ,Condensed Matter - Materials Science ,Focus on Scalable Encapsulation of 2D Materials ,Graphene ,Mechanical Engineering ,large crystal ,Materials Science (cond-mat.mtrl-sci) ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,2D materials ,0104 chemical sciences ,Chemical engineering ,chemistry ,Mechanics of Materials ,encapsulation ,0210 nano-technology ,Layer (electronics) ,transfer - Abstract
Funder: H2020 Marie Skłodowska-Curie Actions; doi: https://doi.org/10.13039/100010665, Hexagonal boron nitride (h-BN) is well-established as a requisite support, encapsulant and barrier for 2D material technologies, but also recently as an active material for applications ranging from hyperbolic metasurfaces to room temperature single-photon sources. Cost-effective, scalable and high quality growth techniques for h-BN layers are critically required. We utilise widely-available iron foils for the catalytic chemical vapour deposition (CVD) of h BN and report on the significant role of bulk dissolved species in h-BN CVD, and specifically, the balance between dissolved oxygen and carbon. A simple pre-growth conditioning step of the iron foils enables us to tailor an error-tolerant scalable CVD process to give exceptionally large h-BN monolayer domains. We also develop a facile method for the improved transfer of as-grown h-BN away from the iron surface by means of the controlled humidity oxidation and subsequent rapid etching of a thin interfacial iron oxide; thus, avoiding the impurities from the bulk of the foil. We demonstrate wafer-scale (2 inch) production and utilise this h-BN as a protective layer for graphene towards integrated (opto) electronic device fabrication., European Union's Horizon 2020 research and innovation program under Grant Agreement No number 785219. European Union's Horizon 2020 research and innovation program under Grant Agreement No number 796388. the Royal Commission for the Exhibition of 1851. EU Marie Skłodowska-Curie Individual Fellowship (Global) under grant ARTIST (No. 656870). EPSRC (EP/P005152/1, and Doctoral Training Award EP/M508007/1). U.K. Department of Business, Energy and Industrial Strategy (NPL Project Number 121452).
- Published
- 2019
4. A Chemically Patterned Microfluidic Paper-based Analytical Device (C-µPAD) for Point-of-Care Diagnostics
- Author
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Trinh Lam, Jungkyu Kim, Jasmine Pramila Devadhasan, and Ryan Howse
- Subjects
Paper ,Materials science ,Point-of-Care Systems ,Science ,Microfluidics ,02 engineering and technology ,Chemical vapor deposition ,01 natural sciences ,Article ,Chemistry Techniques, Analytical ,chemistry.chemical_compound ,Trichlorosilane ,medicine ,Fluidics ,Immunoassay ,Detection limit ,Multidisciplinary ,Chromatography ,medicine.diagnostic_test ,Diagnostic Tests, Routine ,010401 analytical chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Standard curve ,Paper chromatography ,chemistry ,13. Climate action ,Medicine ,0210 nano-technology - Abstract
A chemically patterned microfluidic paper-based analytical device (C-µPAD) is developed to create fluidic networks by forming hydrophobic barriers using chemical vapor deposition (CVD) of trichlorosilane (TCS) on a chromatography paper. By controlling temperature, pattern size, and CVD duration, optimal conditions were determined by characterizing hydrophobicity, spreading patterns, and flow behavior on various sized fluidic patterns. With these optimal conditions, we demonstrated glucose assay, immunoassay, and heavy metal detection on well-spot C-µPAD and lateral flow C-µPAD. For these assays, standard curves showing correlation between target concentration and gray intensity were obtained to determine a limit of detection (LOD) of each assay. For the glucose assays on both well-spot C-µPAD and lateral flow C-µPAD, we achieved LOD of 13 mg/dL, which is equivalent to that of a commercial glucose sensor. Similar results were obtained from tumor necrosis factor alpha (TNFα) detection with 3 ng/mL of LOD. For Ni detection, a colorimetric agent was immobilized to obtain a stationary and uniform reaction by using thermal condensation coupling method. During the immobilization, we successfully functionalized amine for coupling the colorimetric agent on the C-µPAD and detected as low as 150 μg/L of Ni. These C-µPADs enable simple, rapid, and cost-effective bioassays and environmental monitoring, which provide practically relevant LODs with high expandability and adaptability.
- Published
- 2017
5. Deposition of SiO2-like diffusion barriers on PET and paper by PECVD
- Author
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Grüniger, A. and Rudolf von Rohr, P.
- Subjects
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SILICON oxide , *PERMEABILITY , *CHEMICAL vapor deposition , *MICROWAVE plasmas - Abstract
The deposition of silicon oxide thin films as diffusion barriers on paper based substrates by means of plasma enhanced chemical vapor deposition has been investigated. Polyethylenetherephtalate film served as reference substrate. A microwave-driven slot antenna plasma source was utilized. To measure the material oxygen permeability a device has been developed which allows to measure in a broader permeability range than commercially available instruments. In addition, it also enables to detect pores in the material surface by varying the total pressure difference between the measuring chambers. It is shown that the existence of persistent pores in the substrate material is in direct relation to the success of a silicon oxide coating in terms of the reduction of the oxygen permeability. If the material possesses a totally sealed surface a reduction of the oxygen permeability in the same order of magnitude as on polymeric webs is possible. [Copyright &y& Elsevier]
- Published
- 2003
- Full Text
- View/download PDF
6. All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene.
- Author
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Çıtak, Emre, İstanbullu, Bilal, Şakalak, Hüseyin, Gürsoy, Mehmet, and Karaman, Mustafa
- Subjects
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GRAPHENE , *CHEMICAL vapor deposition , *HYDROPHOBIC surfaces , *FLUOROALKYL compounds , *THIN films - Abstract
In this study, the successful transfer of chemical vapor deposition (CVD)‐grown graphene on an ordinary printing paper surface is demonstrated. Pristine paper is not a suitable substrate for graphene transfer because of its fragile and hydrophilic nature against the chemicals used during the transfer process. Two different fluoroalkyl polymers, namely poly(hexafluorobutyl acrylate) (PHFBA) and poly(perfluorodecyl acrylate) (PPFDA) are coated on paper surfaces by an initiated CVD (iCVD) technique to make the paper surfaces hydrophobic. Hydrophobicity is found to be an important factor in order for the graphene to be transferred onto the paper substrate. Although surfaces coated with PPFDA possess better hydrophobicity owing to their longer perfluoroalkyl group and higher roughness, the graphene transfer is found to be more successful on a PHFBA‐coated surface. A thin film of PHFBA on the paper surface acts as a prime layer for effective and defect‐free transfer of graphene and makes the paper surface ideal and robust during the graphene transfer process. The as‐transferred graphene layer on the PHFBA‐coated paper surface shows high conductivity values, even after repeated folding and flattening cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
7. Hall of Fame Article: Device Fabrication Based on Oxidative Chemical Vapor Deposition (oCVD) Synthesis of Conducting Polymers and Related Conjugated Organic Materials (Adv. Mater. Interfaces 1/2019).
- Author
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Heydari Gharahcheshmeh, Meysam and Gleason, Karen K.
- Subjects
CONDUCTING polymers ,CHEMICAL vapor deposition ,SUBSTRATES (Materials science) ,TEXTILES ,PAPER - Abstract
Uniform, ultra‐thin, and conformal films of conducting polymers can be readily fabricated directly onto large‐area substrates by oxidative chemical vapor deposition (oCVD). Since oCVD avoids high substrate temperatures and the use of solvents, no transfer step is required for integrating oCVD films into devices, even when employing paper and textile substrates. More details can be found in article number 1801564 by Meysam Heydari Gharahcheshmeh and Karen K. Gleason. Photo‐illustration by Felice C. Frankel. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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