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AFM Imaging of Molecular Spin‐State Changes through Quantitative Thermomechanical Measurements
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Babichev A. V. Pashnev D. A. Gladyshev A. G. Kurochkin A. S. Kolodeznyi E. S. Karachinsky L. Ya. Novikov I. I. Denisov D. V. Boulley L. Firsov D. A. Vorobjev L. E. Pikhtin N. A. Bousseksou A. Egorov A. Yu. 《Technical Physics Letters》2019,45(11):1136-1139
Technical Physics Letters - Spectral redistribution of the intensity of short- and long-wavelength emission components within gain bandwidth of a 7- to 8-μm quantum-cascade laser under the... 相似文献
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Heat Capacity and Thermal Damping Properties of Spin-Crossover Molecules: A New Look at an Old Topic
Karl Ridier Yuteng Zhang Mario Piedrahita-Bello Carlos M. Quintero Lionel Salmon Gábor Molnár Christian Bergaud Azzedine Bousseksou 《Advanced materials (Deerfield Beach, Fla.)》2020,32(21):2000987
The thermally induced spin-crossover (SCO) phenomenon in transition metal complexes is an entropy-driven process, which has been extensively studied through calorimetric methods. Yet, the excess heat capacity associated with the molecular spin-state switching has never been explored for practical applications. Herein, the thermal damping effect of an SCO film is experimentally assessed by monitoring the transient heating response of SCO-coated metallic microwires, Joule-heated by current pulses. A damping of the wire temperature, up to 10%, is evidenced on a time scale of tens of microseconds due to the spin-state switching of the molecular film. Fast heat-charging dynamics and negligible fatigability are demonstrated, which, together with the solid-solid nature of the spin transition, appear as promising features for achieving thermal energy management applications in functional devices. 相似文献
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D Costantini L Greusard A Bousseksou R Rungsawang TP Zhang S Callard J Decobert F Lelarge GH Duan Y De Wilde R Colombelli 《Nano letters》2012,12(9):4693-4697
We demonstrate a semiconductor laser-based approach which enables plasmonic active devices in the telecom wavelength range. We show that optimized laser structures based on tensile-strained InGaAlAs quantum wells-coupled to integrated metallic patternings-enable surface plasmon generation in an electrically driven compact device. Experimental evidence of surface plasmon generation is obtained with the slit-doublet experiment in the near-field, using near-field scanning optical microscopy measurements. 相似文献
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Bartual-Murgui C Akou A Salmon L Molnár G Thibault C Real JA Bousseksou A 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(23):3385-3391
Nanopatterned thin films of the metal-organic framework {Fe(bpac)[Pt(CN)4]} (bpac=bis(4-pyridyl)acetylene) are elaborated by the combination of a sequential assembly process and a lithographic method. Raman microspectroscopy is used to probe the temperature dependence of the spin state of the iron(II) ions in the films (40-90 nm in thickness), and reveals an incomplete but cooperative spin transition comparable to that of the bulk material. Adsorption/desorption of pyridine guest molecules is found to have a substantial influence on the spin-crossover properties of the thin layers. This interplay between host-guest and spin-crossover properties in thin films and nanopatterns demonstrates the potential ability of using this kind of material as a microsensor. 相似文献
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A. V. Babichev A. Bousseksou N. A. Pikhtin I. S. Tarasov E. V. Nikitina A. N. Sofronov D. A. Firsov L. E. Vorobjev I. I. Novikov L. Ya. Karachinsky A. Yu. Egorov 《Semiconductors》2016,50(10):1299-1303
The room-temperature generation of multiperiod quantum-cascade lasers (QCL) at a wavelength of 5.8 μm in the pulsed mode is demonstrated. The heterostructure of a quantum-cascade laser based on a heterojunction of InGaAs/InAlAs alloys is grown by molecular-beam epitaxy and incorporates 60 identical cascades. The threshold current density of the stripe laser 1.4 mm long and 22 μm wide is ~4.8 kA/cm2 at a temperature of 303 K. The maximum power of the optical-radiation output from one QCL face, recorded by a detector, is 88 mW. The actual optical-power output from one QCL face is no less than 150 mW. The results obtained and possible ways of optimizing the structure of the developed quantum-cascade lasers are discussed. 相似文献
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Victoria Shalabaeva Alin‐Ciprian Bas Mario Piedrahita‐Bello Karl Ridier Lionel Salmon Christophe Thibault William Nicolazzi Gbor Molnr Azzedine Bousseksou 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(47)
Thin films of the molecular spin‐crossover complex [Fe(HB(1,2,4‐triazol‐1‐yl)3)2] undergo spin transition above room temperature, which can be exploited in sensors, actuators, and information processing devices. Variable temperature viscoelastic mapping of the films by atomic force microscopy reveals a pronounced decrease of the elastic modulus when going from the low spin (5.2 ± 0.4 GPa) to the high spin (3.6 ± 0.2 GPa) state, which is also accompanied by increasing energy dissipation. This technique allows imaging, with high spatial resolution, of the formation of high spin puddles around film defects, which is ascribed to local strain relaxation. On the other hand, no clustering process due to cooperative phenomena was observed. This experimental approach sets the stage for the investigation of spin transition at the nanoscale, including phase nucleation and evolution as well as local strain effects. 相似文献
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Babichev A. V. Gladyshev A. G. Kurochkin A. S. Kolodeznyi E. S. Sokolovskii G. S. Bougrov V. E. Karachinsky L. Ya. Novikov I. I. Bousseksou A. G. Egorov A. Yu. 《Semiconductors》2018,52(8):1082-1085
Semiconductors - Room-temperature lasing at a wavelength of 8 μm in multistage quantum-cascade lasers pumped by current pulses is demonstrated. A quantum-cascade laser heterostructure based on... 相似文献