TY - JOUR

T1 - Highly Transparent, Yet Photoluminescent

T2 - 2D CdSe/CdS Nanoplatelet-Zeolitic Imidazolate Framework Composites Sensitive to Gas Adsorption

AU - Klepzig, Lars F.

AU - Keppler, Nils C.

AU - Rudolph, Dominik A.

AU - Schaate, Andreas

AU - Behrens, Peter

AU - Lauth, Jannika

N1 - Funding Information: L.F.K. and N.C.K. contributed equally to this work. The authors thank André Niebur for TEM measurements, and the Laboratory of Nano and Quantum Engineering (LNQE) in Hannover for access to the TEM. The authors thank Nadja Bigall and Dirk Dorfs for access to the UV‐vis‐NIR absorption and emission spectrometers. The authors were grateful for funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). J.L. gratefully acknowledges additional funding by the Caroline Herschel program of the Leibniz Universität Hannover.

PY - 2024/5/2

Y1 - 2024/5/2

N2 - In this work, thin composite films of zeolitic imidazolate frameworks (ZIFs) and colloidal two-dimensional (2D) core-crown CdSe/CdS nanoplatelet (NPL) emitters with minimal scattering are formed by a cycled growth method and yield highly transparent coatings with strong and narrow photoluminescence of the NPLs at 546 nm (FWHM: 25 nm) in a solid-state composite structure. The porous ZIF matrix acts as functional encapsulation for the emitters and enables the adsorption of the guest molecules water and ethanol. The adsorption and desorption of the guest molecules is then characterized by a reversable photoluminescence change of the embedded NPLs. The transmittance of the composite films exceeds the values of uncoated glass at visible wavelengths where the NPL emitters show no absorption (>540 nm) and renders them anti-reflective coatings. At NPL absorption wavelengths (440–540 nm), the transmittance of the thin composite film-coated glass lies close to the transmittance of uncoated glass. The fast formation of innovative, smooth NPL/ZIF composite films without pre-polymerizing the colloidal 2D nanostructures first provides a powerful tool toward application-oriented photoluminescence-based gas sensing.

AB - In this work, thin composite films of zeolitic imidazolate frameworks (ZIFs) and colloidal two-dimensional (2D) core-crown CdSe/CdS nanoplatelet (NPL) emitters with minimal scattering are formed by a cycled growth method and yield highly transparent coatings with strong and narrow photoluminescence of the NPLs at 546 nm (FWHM: 25 nm) in a solid-state composite structure. The porous ZIF matrix acts as functional encapsulation for the emitters and enables the adsorption of the guest molecules water and ethanol. The adsorption and desorption of the guest molecules is then characterized by a reversable photoluminescence change of the embedded NPLs. The transmittance of the composite films exceeds the values of uncoated glass at visible wavelengths where the NPL emitters show no absorption (>540 nm) and renders them anti-reflective coatings. At NPL absorption wavelengths (440–540 nm), the transmittance of the thin composite film-coated glass lies close to the transmittance of uncoated glass. The fast formation of innovative, smooth NPL/ZIF composite films without pre-polymerizing the colloidal 2D nanostructures first provides a powerful tool toward application-oriented photoluminescence-based gas sensing.

KW - colloidal nanoplatelets

KW - composite materials

KW - encapsulation

KW - gas sensitivity

KW - metal-organic frameworks

KW - mof thin films

KW - photoluminescence

UR - http://www.scopus.com/inward/record.url?scp=85179355740&partnerID=8YFLogxK

U2 - 10.1002/smll.202309533

DO - 10.1002/smll.202309533

M3 - Article

AN - SCOPUS:85179355740

VL - 20

JO - SMALL

JF - SMALL

SN - 1613-6810

IS - 18

M1 - 2309533

ER -