Jump to Main Content
Welding Metallophthalocyanines into Bimetallic Molecular Meshes for Ultrasensitive, Low-Power Chemiresistive Detection of Gases
- Meng, Zheng, Aykanat, Aylin, Mirica, Katherine A.
- Journal of the American Chemical Society 2018 v.141 no.5 pp. 2046-2053
- X-ray photoelectron spectroscopy, ammonia, chemical species, coordination polymers, detection limit, electric potential difference, electron paramagnetic resonance spectroscopy, gases, humidity, hydrogen sulfide, nickel, nitric oxide, porous media, welding
- This paper describes the first demonstration of using a series of isoreticular nickel phthalocyanine- and nickel naphthalocyanine-based bimetallic conductive two-dimensional (2D) metal–organic frameworks (MOFs) as active materials in chemiresistive sensing of gases. Devices achieve exceptional sensitivity at sub-part-per-million (ppm) to part-per-billion (ppb) detection limits toward NH₃ (0.31–0.33 ppm), H₂S (19–32 ppb), and NO (1.0–1.1 ppb) at low driving voltages (0.01–1.0 V) within 1.5 min of exposure. The devices maintain their performance in the presence of humidity (5000 ppm of H₂O). The isoreticular analogs enable modular control over selectivity and sensitivity in gas sensing through different combinations of linkers and metal nodes. Electron paramagnetic resonance spectroscopy and X-ray photoelectron spectroscopy studies suggest that the chemiresistive response of the MOFs involves charge transfer interactions triggered by the analytes adsorbed on MOFs.