2 research outputs found
Long-Term Durability and Cycling of Nanoporous Materials Based Impedance NO<sub>2</sub> Sensors
Nanoporous materials, including metal–organic
frameworks
(MOFs) and inorganic zeolites, are gaining attention as gas sensor
materials due to their chemical selectivity and robustness. To advance
industrial viability of these materials as sensors, long-term, variable
environment testing is needed to evaluate their stability and continued
chemical exposure response. Nanoporous materials-based direct electrical
readout sensors were evaluated for 3 months under dry or humid conditions
at 74 °C. The sensors were comprised of either Ni-MOF-74, Mg-MOF-74,
or Ni-SSZ-13 zeolite. Additionally, we describe the development of
multichambered sensor testing platforms that allows uninterrupted
direct impedance monitoring of each sensor over long test periods.
Results indicate relative stability in dry conditions for the sensors
over time. In contrast, degradation of the active sensing material
is evident in the humid environment. Collectively, these results demonstrate
need for long-term testing of emerging nanoporous sensor materials
under specific environmental conditions
Simple, Benign, Aqueous-Based Amination of Polycarbonate Surfaces
Polycarbonate
is a desirable material for many applications due
to its favorable mechanical and optical properties. Here, we report
a simple, safe, environmentally friendly aqueous method that uses
diamines to functionalize a polycarbonate surface with amino groups.
The use of water as the solvent for the functionalization ensures
that solvent induced swelling does not affect the optical or mechanical
properties of the polycarbonate. We characterize the efficacy of the
surface amination using X-ray photo spectroscopy, Fourier transform
infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and
contact angle measurements. Furthermore, we demonstrate the ability
of this facile method to serve as a foundation upon which other functionalities
may be attached, including antifouling coatings and oriented membrane
proteins