Abstract
Optical properties, which determine the application of optical devices in different fields, are the most significant properties of optical thin films. In recent years, Metal-organic framework (MOF)-based optical thin films have attracted increasing attention because of their novel optical properties and important potential applications in optical and photoelectric devices, especially optical thin films with tunable optical properties. This study reports the first example of tuning the optical properties of a MOF-based optical thin film via post-modification. The MOF-based optical thin film was composed of NH2-MIL-53(Al) nanorods (NRs) (MIL: Materials from Institute Lavoisier), and was constructed via a spin-coating method. Three aldehydes with different lengths of carbon chains were chosen to modify the MOF optical thin film to tune their optical properties. After post-modification, the structural color of the NH2-MIL-53(Al) thin film showed an obvious change from purple to bluish violet and cyan. The reflection spectrum and the reflectivity also altered in different degrees. The effective refractive index (neff) of MOFs thin film can also be tuned from 1.292 to 1.424 at a wavelength of 750 nm. The success of tuning of the optical properties of MOFs thin films through post-modification will make MOFs optical thin films meet different needs of optical properties in various optical and optoelectronic devices.
Highlights
Metal organic frameworks (MOFs) are crystalline porous organic-inorganic hybrid materials that consist of metal ions or clusters coordinated to organic ligands to form one, two, or three-dimensional structures [1,2]
The NRs were further characterized by X-Ray Diffraction (XRD), Fourier transform infrared (FT-IR), Thermogravimetric analysis (TGA) tiaCaaocNisongronfoooHdr3nmdtueNhift2ecnipei-NmHramBdramtm2Dre2ie1e-nnsassMC7d.gtd1(t,TwwFsI0hLtahoiheiigcl-erttlme5uhhpfN3rtoo−btte(ihRhrfoaA1m1eesnndtlCsFw)dh-aidi–sTetsmeNFaie-orIpo)suceRR.nofpalTfsaresrtuhtpohpaberwefrteoetdiehcoxaopdptpebsynru,rrausloirticeinmtnetshgreodovarrnoiNtgenorchfaadouaH[ecNtto3peptri27denHmdso-]rgMw,i2scawzw-aadIBeg(lLerdhFelrDbr-eriioe5bcCgoeXfh3yxum,ctR(ytcrXhAoheDeoleRoinelnc)1rDcptfib.dCagaa,rwCrirtm–nFnbtooFiTedoastumr)-shxt.nItpeyRhopTdslotfe,ahhfgaTtrfweehrNtoeGoerdaoiHsAumtprbihpmo2wrasa-souetnMAuiitrwntodolvhlIdann3eLNe+tra.-odet1e5t2hdfe7N3capedp1(odAHop0uocFswarlaro2cT)e-tdrmrdMt-NbpNieIeno−RtrRIr1HaixnLostydX2es-nlw-5i[pdRi-Ms3c3deaaD7w(egcsIpA]Lstr,ipirpoot-lnhu)5weruap3agmtpANh(ttrosAeieilooRc3raodldn+nh)stf
The MOF-based optical thin films with a uniform color were fabricated by spin-coating using a NH2-MIL-53(Al) NR solution
Summary
Metal organic frameworks (MOFs) are crystalline porous organic-inorganic hybrid materials that consist of metal ions or clusters coordinated to organic ligands to form one-, two-, or three-dimensional structures [1,2] They have attracted immense attention due to their outstanding features, such as ultrahigh porosity [3], large internal surface area [4], good thermal stability [5] and high chemical tailorability [6]. Post-synthetic methods have become an efficient way to achieve the chemical modification of MOFs due to the abundant and ready reactions of linkage ligand molecules [6]. Tdheegreefefeocftimveordeiffricaacttiiovne winedreexc(hnaerffa)cotefritzheedMbOy FX-trhaiyn pfihlmotowelaesctrreoandislpyetcutrnoesdcofproym(X1P.2S9).2Tthoe1s.4u2c4ceasts tohfetwunaivnegleonfgtthheofo7p5ti0canlmp.roTpheertsiuesccoefssMoOf Fpotshti-nmofidlmifictahtriooungahndpotshte-mdoedgirfeiecaotifomn owdiilfil cmataiokne wMeOreF cohpatriaccatletrhizinedfiblmy sX-mraeyetpthhoetodeilfefecrtreonnt srpeqecutirroesdcooppyti(cXaPl pS)r.oTpheertsiuesccienssvaorfitouunsinogptoifcathleanopdtoicpatloperloepcterrotineisc odfeMvicOeFs. thin film through post-modification will make MOF optical thin films meet the different required optical properties in various optical and optoelectronic devices. The last remaining piece of the MOF film was soaked in pure toluene at the same time
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