Electrically bistable devices play an important role
in the next
generation of information materials. Plasmonic noble metal nanoparticles
(Au and Ag NPs) with diameters <6 nm were embedded into 3-D Cd-based
metal–organic framework (MOF) matrixes via the photoreduction
method to generate Au (Ag) NPs@MOF composites. Electrical bistability
measurements on the sandwiched ITO/NPs@MOF/silver devices indicate
that two switchable conductivity states with nonvolatile memory behaviors
can be observed. The ITO/Au NP@2/Ag device with neutral
matrix possesses the highest ON/OFF current ratio of 104, which can be attributed to its higher electron tunneling efficiency
because of the better dispersity of Au NPs in the MOF matrix. A mechanism
regarding the electric-field-induced charge-transfer process assisted
by conformational change in the active layer was proposed.
Dye@Cd-LMOCs composites exhibit interesting solvent-dependent chromismic fluorescence, in which a two step solvent exchange process and a new electron transfer route are proposed.
Host-guest encapsulationo ff unctional organic dye into ap orousm etal-organic framework can give rise to the developmento fn ew functional materials. In this work, by intercalating the stilbazolium-type dye (DEAST)I (4'-diethylamino-N-methyl stilbazolium) into four lanthanide layered metal-organic complexes (Ln-LMOCs), i. e. (3), Er (4)), four responsive (DEAST)I@Ln-LMOCc omposites have been prepared, serving as multifunctional performance platform. The core-shell structures of (DEAST)I@Ln-LMOC composites have been fully characterizedb yI R, UV/Vis, PXRD, SEM, TEM, TGA and ESR. Significantly,a fter intercalation of dyes, the (DEAST)I@Ln-LMOC composites exhibit enhanced luminescent sensing properties in detecting Fe 3 + with much higherw ater stabilities. The luminescent sensing behavior stems from the fluorescencer esonance energy transfer (FRET) from the p-electron-rich BTB ligands to the Fe 3 + ,a nd their higher water stabilities are induced by electrostatici nteractions and lower porosity.S pecially,t he characteristic emissions of Sm 3 + will not be affected after the encapsulation guest dyes, which provideatheoretical guide for the modulation of luminescence devices.F inally,b etter ion conductivities andd iminished photocurrents can be achieved after the embedding of the functional organic dye. In all, the formation of (DEAST)I@Ln-LMOC composites with core-shell structures can be utilized as am ultifunctional platform with good stability.[a] L.
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