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Claes-Göran Granqvist

Bio: Claes-Göran Granqvist is an academic researcher from Uppsala University. The author has contributed to research in topics: Electrochromism & Thin film. The author has an hindex of 73, co-authored 535 publications receiving 31523 citations. Previous affiliations of Claes-Göran Granqvist include Chalmers University of Technology & Texas A&M University.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a detailed structural model of a thin layer comprising a mixture of Ni and Al2O3 located near the bottom of the anodic film was proposed. But the model was not applied to the metal insulator layer, which was described with the Bruggeman effective medium theory.
Abstract: Ni pigmentation of anodic Al2O3 is obtained by electrolytic coloration. Durable coatings with good spectral selectivity (a/e≃8) are produced. Scanning electron microscopy, Auger depth profiling, and atomic absorption analysis lead to the formulation of a detailed structural model, its most essential feature being a thin layer comprising a mixture of Ni and Al2O3 located near the bottom of the anodic film. Experimental spectral reflectance data agree well with computer calculations, provided the optical properties of the metal‐insulator layer are described with the Bruggeman effective medium theory.

60 citations

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TL;DR: Thin vanadium oxide films were made by vacuum evaporation followed by the annealing posttreatment in the presence of air to establish VO(2) films with a well defined semiconductor-metal transition and concomitant thermochromic switching.
Abstract: Thin vanadium oxide films were made by vacuum evaporation followed by the annealing posttreatment in the presence of air. The thickness increased by a factor as large as ~2.3 on oxidation. Electron diffractograms indicated a bcc → monoclinic transformation during the annealing, and electron micrographs showed pronounced grain growth. Temperature-dependent electrical conductivity as well as spectral transmittance was measured vs annealing time. At an initial thickness of 0.12 μm, it took a few hours to establish VO2 films with a well defined semiconductor–metal transition and concomitant thermochromic switching at ~57°C.

60 citations

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TL;DR: In this paper, Electrochromic Nickel Oxide Films and their compatibility with Potassium Hydroxide and Lithium Perchlorate in Propylene Carbonate: Optical, Electrochemical and Stress-Related Properties

60 citations

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TL;DR: Gas Sensing Properties of Nanocrystalline WO3 Films made by Advanced Reactive Gas Deposition as discussed by the authors, which are made by advanced reactive gas deposition, are discussed in Section 2.
Abstract: Gas Sensing Properties of Nanocrystalline WO3 Films Made by Advanced Reactive Gas Deposition

60 citations

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TL;DR: In this paper, the radiative properties of our natural surroundings and demonstrate how the characteristic features of thermal emission, solar irradiation, atmospheric absorption, and sensitivity of the human eye and of plant photosynthesis lead naturally to a set of solar energy materials with well-defined wavelength and angular-dependent absorptance, emittance, reflectance, and transmittance.

60 citations


Cited by
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TL;DR: Graphene has high mobility and optical transparency, in addition to flexibility, robustness and environmental stability as discussed by the authors, and its true potential lies in photonics and optoelectronics, where the combination of its unique optical and electronic properties can be fully exploited, even in the absence of a bandgap, and the linear dispersion of the Dirac electrons enables ultrawideband tunability.
Abstract: The richness of optical and electronic properties of graphene attracts enormous interest. Graphene has high mobility and optical transparency, in addition to flexibility, robustness and environmental stability. So far, the main focus has been on fundamental physics and electronic devices. However, we believe its true potential lies in photonics and optoelectronics, where the combination of its unique optical and electronic properties can be fully exploited, even in the absence of a bandgap, and the linear dispersion of the Dirac electrons enables ultrawideband tunability. The rise of graphene in photonics and optoelectronics is shown by several recent results, ranging from solar cells and light-emitting devices to touch screens, photodetectors and ultrafast lasers. Here we review the state-of-the-art in this emerging field.

6,863 citations

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TL;DR: These nontoxic nanomaterials, which can be prepared in a simple and cost-effective manner, may be suitable for the formulation of new types of bactericidal materials.

5,309 citations