The Interplay between Surface Plasmon Resonance and Switching Properties in Gold@Spin Crossover Nanocomposites
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Citations
Iconography : Molecular electronics: Scanning tunneling microscopy and single-molecule devices
Imaging the Thermal Hysteresis of Single Spin-Crossover Nanoparticles.
Room temperature optoelectronic devices operating with spin crossover nanoparticles.
Plasmon-assisted spin transition in gold nanostar@spin crossover heterostructures
Bistable spin-crossover in a new series of [Fe(BPP-R)2]2+ (BPP = 2,6-bis(pyrazol-1-yl)pyridine; R = CN) complexes.
References
Grafting of gold onto spin-crossover nanoparticles: SCO@Au
Isothermal section of the Ce―Au―Sb system at 870 K
Impact of the spin state switching on the dielectric constant of iron (II) spin crossover nanoparticles
Related Papers (5)
Frequently Asked Questions (11)
Q2. How does the spr band of the gold nanoparticle change?
The shift of about 35 nm of the SPR band of the gold nanoparticle embedded in a SCO particle can be used to follow the spin crossover as a function of the temperature.
Q3. What is the effect of the aqueous solution on the AuNRs?
the AuNRs dispersion, which is stable in CTAB (5 mM) aqueous solution, becomes unstable into a hydro-alcoholic mixture and in the presence of Fe(BF4)2.
Q4. What is the effect of AuNRs on the SCO shell?
the AuNRs used seemed to bring a templating property during the synthesis of the composites, leading to welldefined architectures.
Q5. What is the way to improve the heat transfer from AuNPs to SCO?
To further improve the heat transfer from the AuNPs to the SCO NPs avoiding the silica interphase, the authors have recently reported a direct grafting of gold nanospheres onto SCO nanoparticles.
Q6. What is the effect of the AuNRs on the photoswitching effect?
Since the SCO compounds very weakly absorb in their HS state [22] , these experiments evidence the strong enhancement of the photoswitching effect for AuNRs doped SCO NPs.
Q7. What is the spectral region where the SCO is almost transparent?
AuNRs are of particular interest since they exhibit a broad longitudinal surface plasmon resonance (SPR) band centred in the nearinfrared, [10] a spectral region where the SCO in the LS state is almost transparent.
Q8. How many W/cm2 was required to photoswitch AuNRs?
It is worth mentioning that in a previous report, up to 2000 W/cm² (from a Raman spectrometer) was required to photoswitch SCO@SiO2@Au composite compounds. [9]
Q9. What is the effect of AuNRs on the thermal hysteresis loop?
besides the templating effect previously hypothesized in the microscopy analysis, the synthesis using AuNRs seems to broaden the thermal hysteresis loop of both neat SCO and composite nanoparticles present in compounds 4 and 5, compared to compounds 1 and 2.
Q10. How much water is used in the synthesis of the composite materials?
In consequence, the authors decided to perform the synthesis of the composite materials using a solvent mixture of 40 % of ethanol and 60 % of water.
Q11. How much Htrz does the suspension have?
Up to 2 M of Htrz the dispersion remains stable below 40 % of ethanol, even after 24 hours (Table SI1) while above this ratio, the suspension is destabilized (Table SI2 and SI3 and Figure SI3).