Rapid and Selective NH₃ Sensing by Porous CuBr.

ABSTRACT: Fast and selective detection of NH₃ at parts-per-billion (ppb) concentrations with inexpensive and low-power sensors represents a long-standing challenge. Here, a room temperature, solid-state sensor is presented consisting of nanostructured porous (78%) CuBr films. These are prepared by flame-aerosol deposition of CuO onto sensor substrates followed by dry reduction and bromination. Each step is monitored in situ through the film resistance affording excellent process control. Such porous CuBr films feature an order of magnitude higher NH₃ sensitivity and five times faster response times than conventional denser CuBr films. That way, rapid (within 2.2 min) sensing of even the lowest (e.g., 5 ppb) NH₃ concentrations at 90% relative humidity is attained with

SUBMITTER: Guntner AT 

PROVIDER: S-EPMC7140997 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature