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Research Papers

Detection of molecular spin-state changes in ultrathin films by photonic methods

[+] Author Affiliations
Il’ya A. Gural’skiy

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

National Taras Shevchenko University, Department of Chemistry, 62a Volodymyrska Street, 01033, Kiev, Ukraine

Carlos M. Quintero

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

Khaldoun Abdul-Kader

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

Manuel Lopes

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

Carlos Bartual-Murgui

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

CNRS & Université de Toulouse (UPS, INSA, IAES), LAAS, 7 avenue du colonel Roche, 31077 Toulouse, France

Lionel Salmon

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

Pengxiang Zhao

Univ. Bordeaux, ISM, CNRS, UMR 5255, F-33405 Talence, France

Gábor Molnár

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

Didier Astruc

Univ. Bordeaux, ISM, CNRS, UMR 5255, F-33405 Talence, France

Azzedine Bousseksou

CNRS and Université de Toulouse (UPS, INP), Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France

J. Nanophoton. 6(1), 063517 (Aug 07, 2012). doi:10.1117/1.JNP.6.063517
History: Received May 24, 2012; Revised June 27, 2012; Accepted June 27, 2012
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Abstract.  Ultrathin films of molecular spin crossover materials exhibit very appealing properties for a variety of photonic applications because the spin-state switching is accompanied by a spectacular change of the complex refractive index in a wide spectral range. After examining different optical spectroscopic approaches for the detection of spin-state changes in nanometric films, we found that conventional light absorption measurements can be used down to the nanometer thickness if the oscillator strength of the transition is high, which is often the case for charge transfer transitions in the ultraviolet range. Methods based on fluorescence energy transfer provide a straightforward means for detecting spin-state changes in films in the visible wavelength range, even if photobleaching may be a problem for certain luminophores. Alternatively, changes in the refractive index accompanying the spin transition can be conveniently determined by surface plasmon resonance spectroscopy, which can also provide very accurate film thickness determination. Plasmonic effects were also used to investigate spin-crossover films by means of surface-enhanced Raman spectroscopy. We found that this technique can provide information not only on the spin state of the molecules in very thin layers, but also on their chemical composition and structure.

Figures in this Article
© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Il’ya A. Gural’skiy ; Carlos M. Quintero ; Khaldoun Abdul-Kader ; Manuel Lopes ; Carlos Bartual-Murgui, et al.
"Detection of molecular spin-state changes in ultrathin films by photonic methods", J. Nanophoton. 6(1), 063517 (Aug 07, 2012). ; http://dx.doi.org/10.1117/1.JNP.6.063517


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