Two-Dimensional Conductive π–d Frameworks with Multiple Sensory Capabilities

Abstract

Two-dimensional (2D) metal–molecule hybrid frameworks have attracted great attention due to their π–d interactions for the charge–spin–lattice coupling, promising for next-generation molecular electronics. However, a high electrical conductivity is indispensable to realize such potential. Herein, we design and assemble a conductive 2D conjugated coordination thin film through an interfacial reaction between the aqueous and organic phases. Its electronic conducting properties are derived from the π–d coupling interactions to achieve an electrical conductivity of 1.05 S/cm, while the stimulus-dependent π–d interactions induce multifunctional sensory capabilities. The Co–DABDT (DABDT = 2,5-diamino-1,4-benzenedithiol dihydrochloride) thin films demonstrate an excellent performance for sensing light, strain, temperature, and humidity, as well as robust mechanical stability. The 2D frameworks with multisensing properties for real-time static and dynamic monitoring are promising for smart wearable electronic systems.

Flexible Lead-Free X-ray Detector from Metal–Organic Frameworks

“…To further confirm the structure of Ni-DABDT, we further carry out Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray diffraction (XRD) (Figure c–e). Two characteristic vibrations of −NH 3 Cl (2580 and 2810 cm –1 ) and one characteristic stretching mode of −SH (2460 cm –1 ) are diminished in the FTIR spectra of Ni-DABDT (Figures c), whereas the vibrations of the benzene ring (1450–1600 cm –1 ) remain, indicating the transformations from −NH 2 and −SH to −NH– and −S–, respectively. , The Raman peak of as-prepared Ni-DABDT near 1500 cm –1 can be ascribed to the C–C stretching within the bridging ligand ring (Figure d). XRD is measured to explore the crystallinities of Ni-DABDT.…”

“…The energy-dispersive X-ray spectroscopy (EDS) spectrum (Figure S1b) and mapping confirm the existence of carbon, sulfur, nitrogen, and nickel and manifest their uniform distribution. To further confirm the structure of Ni-DABDT, we further carry out Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray diffraction (XRD) (Figure 2c 23,24 The Raman peak of asprepared Ni-DABDT near 1500 cm −1 can be ascribed to the C−C stretching within the bridging ligand ring (Figure 2d).…”

Machine Learning for Screening Small Molecules as Passivation Materials for Enhanced Perovskite Solar Cells

“…f) Comparison of the predicted PCE Enhancement (orange deviation bar) and reported PCE enhancement (colored dots data) of PSCs after small molecule passivation in the latest published papers. [ 49–58 ].…”

Ion‐in‐Conjugation: A Promising Concept for Multifunctional Organic Semiconductors

“…M‐DABDT (DABDT = 2,5‐diaminobenzene‐1,4‐dithiol and M = Cu 2+ , Ni 2+ , Zn 2+ , Pt 2+ ), typical 1D π‐d conjugated coordination polymers, can also detect humidity, and Cu‐DABDT has the largest impedance variation of 10 2 –10 8 Ω among all reported results which could be used to fabricate breath monitoring device ( Figure ). [ 77 ] In addition, Co‐DADBT has multiple sensory capabilities, [ 79 ] such as a humidity response with a range from 20% to 90% RH, photosensitivity of 1.66 µA mW cm −2 , a strain gauge factor of 32, and temperature sensitivity of 0.44% °C −1 .…”