Luminescent and Magnetic Tb-MOF Flakes Deposited on Silicon

Molecules

Nicholas S. Settineri¹  Sara Fuertes²  Elena Bartolomé³  Pablo Sevilla³  Sergio Herce⁴  Anna Palau⁴  Narcis Mestres⁴  Ana Arauzo⁵  E. Carolina Sañudo⁶  Jonay González⁶  Laura Navarro-Spreafico⁶ 

[1] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;Departamento de Química Inorgánica, Facultad de Ciencias, Instituto de Síntesis Química y Catalisis, Homogénea (ISQCH), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain;Department of Mechanical Engineering, Escola Universitària Salesiana de Sarrià (EUSS), Passeig de Sant Joan Bosco 74, 08017 Barcelona, Spain;Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), 08017 Barcelona, Spain;Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain;Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica Universitat de Barcelona, C/Martí i Franquès, 1-11, 08028 Barcelona, Spain;

关键词: 2D MOFs;    lanthanides;    luminescence;    magnetic anisotropy;    exfoliation;    flakes;   

DOI  :  10.3390/molecules26185503

来源: DOAJ

【 摘 要 】

The synthesis of a terbium-based 2D metal–organic framework (MOF), of formula [Tb(MeCOO)(PhCOO)₂] (1), a crystalline material formed by neutral nanosheets held together by Van der Waals interactions, is presented. The material can be easily exfoliated by sonication and deposited onto different substrates. Uniform distributions of Tb-2D MOF flakes onto silicon were obtained by spin-coating. We report the luminescent and magnetic properties of the deposited flakes compared with those of the bulk. Complex 1 is luminescent in the visible and has a sizeable quantum yield of QY = 61% upon excitation at 280 nm. Photoluminescence measurements performed using a micro-Raman set up allowed us to characterize the luminescent spectra of individual flakes on silicon. Magnetization measurements of flakes-on-silicon with the applied magnetic field in-plane and out-of-plane display anisotropy. Ac susceptibility measurements show that 1 in bulk exhibits field-induced slow relaxation of the magnetization through two relaxation paths and the slowest one, with a relaxation time of τ_lf ≈ 0.5 s, is assigned to a direct process mechanism. The reported exfoliation of lanthanide 2D-MOFs onto substrates is an attractive approach for the development of multifunctional materials and devices for different applications.

【 授权许可】

Unknown