Detection of nano- and micro- aerosols using Multiphoton Electron Extraction Spectroscopy (MEES)

Physical and Analytical Chemistry Seminar

Lecturer: Sarah Schory

06-06 Oct 2019 @ 12:30

Location: Faculty Seminar Room


Air pollution pose a considerable risk to environment and human health, especially from micro- and nano- aerosols. Particulate matter (PM) is a widespread air pollutant, consisting of a mixture of solid and liquid particles suspended in the air. Common chemical constituents of PM include Sulfates, Nitrates, Carbon, metals, PAHs and allergens. Known indoor air pollutants are micro- and nano- aerosols contain volatile organic compounds (VOCs) and other PM. Recently, it has been found that also laser printers and copy machines emit hazardous aerosols. Although these devices are very common, little information is available on these aerosols, their characterization, origin and the conditions that are responsible for their generation. Their detection is very difficult, therefore, there is a need to develop efficient methods to sample, detect and analyze aerosols from these sources. Our goal was to develop an analytical method for sampling and detecting of micro- and nano- aerosols using Multiphoton Electron Extraction Spectroscopy (MEES). This is the first attempt of using this new technology in detection of aerosols. MEES is based on multiphoton processes induced on solid surfaces. We succeeded to sample and detect nano-grams of aerosols containing nitrated compounds and aerosols emitted from laser printer toners. Scanning Electron Microscopy was used for determining the size distribution.