Optical gas sensing by semiconductor nanoparticles or organic dye molecules hosted in the pores of mesoporous siliceous MCM-41
Literature Information
Yücel Altindag, Hartwig Wellmann
The presence of different gas atmospheres is optically detected by use of molecular sieves modified with metal oxide clusters or dye molecules. The reversible redox behaviour of tin dioxide clusters, embedded in the regular pores of mesoporous siliceous MCM-41 in reducing and oxidizing atmospheres (CO, H2, NH3, O2) is studied by in-situ diffuse reflectance (DR) UV/Vis spectroscopy. By impregnation with Sn precursors a carpet of SnO2 clusters is formed on the inner pore walls of the MCM-41 due to strong interactions of the tin oxide species with the silanol groups of the MCM-41 matrix. The response time of hosted two-dimensional SnO2 layers for the registration of CO by optical detection is short and concentrations down to 20 ppm CO in air and 50 ppm of H2 or NH3 in air or Ar, respectively, can be monitored. Hydrocarbons adsorbed in the pores of siliceous MCM-41 alter, depending on their chain length, the optical scattering of the mesoporous matrix. Since the gas adsorption depends on the partial pressure of the hydrocarbons this effect can be used to detect hydrocarbons and to monitor their concentration with the help of embedded light absorbing guests. This sensing, however, is only possible with powdered samples and by measuring in diffuse reflectance according to the Kubelka–Munk formalism. The concentration of SO2 in a gas atmosphere can be deduced from the quenching of the fluorescence of rhodamine dye molecules anchored in the pores of siliceous MCM-41.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.









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