Author
Claes-Göran Granqvist
Other affiliations: Chalmers University of Technology, Texas A&M University
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 published on a yearly basis
Papers
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TL;DR: In this paper, the same technique yielded clear, though not yet fully understood, data on the evolution of electrochromism during potentiodynamic cycling using infrared reflectance spectroscopy with obliquely incident p-polarized light.
Abstract: Films of NiOxHy were made by reactive dc magnetron sputtering of Ni followed by electrochemical treatment in KOH. Infrared reflectance spectroscopy with obliquely incident p-polarized light documented a unique topochemical reaction with the bleached state being β–Ni(OH)2 and the colored state being β–NiOOH. The same technique yielded clear, though not yet fully understood, data on the evolution of electrochromism during potentiodynamic cycling.
27 citations
TL;DR: In this paper, the authors present a prototype of a smart window based on W oxide and Ni oxide, and show that it is durable enough for many years of practical use and can be used in a variety of applications.
Abstract: Electrochromic devices such as "smart windows" for energy efficient windows must be durable enough for many years of practical use. Typical devices employ films based on W oxide and Ni oxide, and t ...
27 citations
TL;DR: In this paper, the optical transmittance of such coatings was recorded, provided that proper regard was given to the occurence of sulfide pellicles and to the aggregated nature of the deposits.
26 citations
TL;DR: In this article, the sensitivity and selectivity enhancements of resistive fluctuation-enhanced sensors are studied at the generic level with a few concrete examples and include the estimation of scaling relations between the sensor size, speed of measurements, sampling rate, measurement time, signal power and noise power.
Abstract: Information theoretical tools are applied for the study of the sensitivity and selectivity enhancements of resistive fluctuation-enhanced sensors. General considerations are given for the upper limit of selectivity enhancement. The signal-to- noise ratio and information channel capacity of fluctuation-enhanced chemical sensors is compared to that of classical sensors providing a single output. The considerations are done at the generic level with a few concrete examples and include the estimation of scaling relations between the sensor size, speed of measurements, sampling rate, measurement time, signal power and noise power.
25 citations
TL;DR: The visual appearance of antireflection-coated transparent and heat-reflecting indium-tin-oxide films on glass was studied by a colorimetric analysis in which the chromaticity coordinates for transmitted and reflected daylight were evaluated for various film thicknesses.
Abstract: The visual appearance of antireflection-coated transparent and heat-reflecting indium-tin-oxide (ITO) films on glass was studied by a colorimetric analysis in which the chromaticity coordinates for transmitted and reflected daylight were evaluated for various film thicknesses. A color purity of <1% in normal transmission and <10% in normal reflection could be achieved with ITO thicknesses in the 220-260- or 335-365-nm ranges and MgF2 thicknesses in the 90-105-nm range. These design criteria yield very efficient window coatings with high visual transmittance, low thermal emittance, and little or no perceived color.
25 citations
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Journal Article•
28,685 citations
9,432 citations
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
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