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Lu B, Qi Q, Wang Y, Chang H, Zhai J, You T. Interfacial effect of dual ultra-thin SiO 2 core-triple shell Au@SiO 2@Ag@SiO 2 for ultra-sensitive trinitrotoluene (TNT) detection. RSC Adv 2020; 10:3826-3831. [PMID: 35492681 PMCID: PMC9048382 DOI: 10.1039/c9ra06902j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 11/02/2019] [Indexed: 12/24/2022] Open
Abstract
Nanostructured hybrid Au@SiO2@Ag@SiO2 was developed, which greatly enhanced the surface plasmon resonance effect due to the interfacial effect of dual ultra-thin SiO2 in which the double-superimposed long-range plasmon transfer between Au and Ag and determinand molecules. In addition, the interfacial effect between the inner and outermost silica layer can contribute to the presence of an amplified electric field between Au core and Ag shell, which prevents aggregation and oxidation of nanoparticles. At the same time, the influence of the amount of silica in SiO2 shells on the Surface Enhanced Raman Scattering (SERS) was explored by controlling the experimental conditions. In our experiments, the ultrathin silica coating Au@SiO2@Ag@SiO2 showed the best SERS performance, generating an analytical enhancement factor (AEF) of 5 × 106. At the same time, nanoparticles modified by 4-aminothiophenol (4-ATP) can detect 2,4,6-TNT as low as 2.27 × 10−6 ppb (10−14 M) and exhibit excellent versatility in the detection of nitroaromatics. The results demonstrated that the interfacial effect of double-layer dielectric silica achieved the localized surface plasmon resonance enhancement effect in Au@SiO2@Ag@SiO2. The ultra-sensitive detection of trinitrotoluene (TNT) demonstrates that interfacial effect of double-layer dielectric silica achieves the LSPR enhancement effect in Au@SiO2@Ag@SiO2.![]()
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Affiliation(s)
- Bingxin Lu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University China
| | - Qi Qi
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University China
| | - Yang Wang
- Institute of Chemistry Chinese Academy of Sciences China
| | - Huaiqiu Chang
- National Center for Nanoscience and Technology China
| | - Jin Zhai
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University China
| | - Tingting You
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University China
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Hochdörffer T, Chumakov AI, Wille HC, Schünemann V, Wolny JA. Vibrational properties and cooperativity of the 3D spin crossover network [Fe(pyrazine)][Pt(CN) 4]. Dalton Trans 2019; 48:15625-15634. [PMID: 31418431 DOI: 10.1039/c9dt02139f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nuclear inelastic scattering of synchrotron radiation has been used to determine the phonon density of vibrational states (pDOS) for the high-spin and low-spin phases of the hydrated and dehydrated isomer of the spin crossover polymer [Fe(pyrazine)][Pt(CN)4]. Density functional theory calculations have been performed for molecular models of the 3D polymeric system. The models contain 15 Fe(ii)/Zn(ii) centres and allowed the assignment of the observed bands to the corresponding vibrational modes. Thermodynamic parameters like the mean force constant and the vibrational entropy but also sound velocities of the molecular lattices in both spin states have been derived from the pDOS. Modelling of the low-spin and high-spin centres in the environment or matrix of different spins has revealed the enthalpic and entropic components of the intramolecular cooperativity. In contrast to the 1D spin crossover systems (Rackwitz, et al., Phys. Chem. Chem. Phys., 2013, 15, 15450) based on the rigid 1,2,4-triazole derivatives the distortion of the low-spin iron Fe(ii) centre by the matrix of high-spin Fe(ii) (modelled as Zn(ii)) occurs only in two dimensions, defined by the [M(CN)4]2- sheets, rather than concerning all six Fe-N bonds, as in 1D systems. The enthalpic intramolecular cooperativity has been determined to be 15 kJ mol-1 which is lower than that in 1D systems (20-30 kJ mol-1). Yet, the entropic contribution stabilizes the low-spin state in a low-spin matrix, a behaviour which is opposite to what was found for the 1D systems.
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Affiliation(s)
- Tim Hochdörffer
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | | | | | - Volker Schünemann
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | - Juliusz A Wolny
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
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Affes K, Slimani A, Maalej A, Boukheddaden K. Electro-elastic modeling of thermal and mechanical properties of a spin crossover core/shell nanoparticle. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Adam A, Poggi M, Larquet E, Cortès R, Martinelli L, Coulon PE, Lahera E, Proux O, Chernyshov D, Boukheddaden K, Gacoin T, Maurin I. Strain engineering of photo-induced phase transformations in Prussian blue analogue heterostructures. NANOSCALE 2018; 10:16030-16039. [PMID: 30106078 DOI: 10.1039/c8nr03597k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Heterostructures based on Prussian blue analogues (PBA) combining photo- and magneto-striction have shown a large potential for the development of light-induced magnetization switching. However, studies of the microscopic parameters that control the transfer of the mechanical stresses across the interface and their propagation in the magnetic material are still too scarce to efficiently improve the elastic coupling. Here, this coupling strength is tentatively controlled by strain engineering in heteroepitaxial PBA core-shell heterostructures involving the same Rb0.5Co[Fe(CN)6]0.8·zH2O photostrictive core and isostructural shells of similar thickness and variable mismatch with the core lattice. The shell deformation and the optical electron transfer at the origin of photostriction are monitored by combined in situ and real time synchrotron X-ray powder diffraction and X-ray absorption spectroscopy under visible light irradiation. These experiments show that rather large strains, up to +0.9%, are developed within the shell in response to the tensile stresses associated with the expansion of the core lattice upon illumination. The shell behavior is, however, complex, with contributions in dilatation, in compression or unchanged. We show that a tailored photo-response in terms of strain amplitude and kinetics with potential applications for a magnetic manipulation using light requires a trade-off between the quality of the interface (which needs a small lattice mismatch i.e. a small a-cubic parameter for the shell) and the shell rigidity (decreased for a large a-parameter). A shell with a high compressibility that is further increased by the presence of misfit dislocations will show a decrease in its mechanical retroaction on the photo-switching properties of the core particles.
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Affiliation(s)
- Adeline Adam
- Physique de la Matière Condensée, Ecole Polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France.
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Felts AC, Slimani A, Cain JM, Andrus MJ, Ahir AR, Abboud KA, Meisel MW, Boukheddaden K, Talham DR. Control of the Speed of a Light-Induced Spin Transition through Mesoscale Core-Shell Architecture. J Am Chem Soc 2018; 140:5814-5824. [PMID: 29633838 DOI: 10.1021/jacs.8b02148] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The rate of the light-induced spin transition in a coordination polymer network solid dramatically increases when included as the core in mesoscale core-shell particles. A series of photomagnetic coordination polymer core-shell heterostructures, based on the light-switchable Rb aCo b[Fe(CN)6] c· mH2O (RbCoFe-PBA) as core with the isostructural K jNi k[Cr(CN)6] l· nH2O (KNiCr-PBA) as shell, are studied using temperature-dependent powder X-ray diffraction and SQUID magnetometry. The core RbCoFe-PBA exhibits a charge transfer-induced spin transition (CTIST), which can be thermally and optically induced. When coupled to the shell, the rate of the optically induced transition from low spin to high spin increases. Isothermal relaxation from the optically induced high spin state of the core back to the low spin state and activation energies associated with the transition between these states were measured. The presence of a shell decreases the activation energy, which is associated with the elastic properties of the core. Numerical simulations using an electro-elastic model for the spin transition in core-shell particles supports the findings, demonstrating how coupling of the core to the shell changes the elastic properties of the system. The ability to tune the rate of optically induced magnetic and structural phase transitions through control of mesoscale architecture presents a new approach to the development of photoswitchable materials with tailored properties.
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Affiliation(s)
- Ashley C Felts
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
| | - Ahmed Slimani
- Laboratoire des Matériaux Multifonctionnels et Applications, Faculté des Sciences de Sfax , Université de Sfax , Route de la Soukra km 3.5 - B.P. no. 1171-3000 Sfax , Tunisia
| | - John M Cain
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
| | - Matthew J Andrus
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
| | - Akhil R Ahir
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
| | - Khalil A Abboud
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
| | - Mark W Meisel
- Department of Physics and the National High Magnetic Field Laboratory , University of Florida , Gainesville , Florida 32611-8440 , United States
| | - Kamel Boukheddaden
- Groupe d'Etudes de la Matière Condensée, UMR CNRS 8635-Université de Versailles Saint Quentin En Yvelines, 45 Avenue des Etats-Unis , 78035 Versailles , France
| | - Daniel R Talham
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , United States
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Félix G, Mikolasek M, Shepherd HJ, Long J, Larionova J, Guari Y, Itié JP, Chumakov AI, Nicolazzi W, Molnár G, Bousseksou A. Elasticity of Prussian-Blue-Analogue Nanoparticles. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700796] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Gautier Félix
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Mirko Mikolasek
- CS40220; ESRF - The European Synchrotron; 38043 Grenoble Cedex 9 France
| | - Helena J. Shepherd
- School of Physical Sciences; University of Kent; Park Wood Rd CT2 7NH Canterbury United Kingdom
| | - Jérôme Long
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Joulia Larionova
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Yannick Guari
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Jean-Paul Itié
- Synchrotron SOLEIL; L'Orme des Merisiers; Saint-Aubin 91192 Gif-sur-Yvette France
| | | | - William Nicolazzi
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
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