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Novel hydrogen sulfide sensors for portable monitors.
Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, R44-OH-007471, 2006 Dec; :1-35
The primary objective of this SBIR Phase II project was to design, develop, and demonstrate a better sensor technology for detecting the presence of hydrogen sulfide (H2S), a particularly hazardous gas species. Because of the potential for adverse health effects at very low concentrations, the industrial hygiene community is continually seeking improved performance from H2S sensors. Specific requirements include reliable and accurate detection in real time, quantitative measurement capabilities, low purchase and life cycle costs, and low power consumption (for portability). Sensors meeting these requirements are in demand for numerous applications within the health and safety field. Synkera proposed to use its expertise in materials engineering and component fabrication to create a new sensor device to meet these challenges. The original concept was to take advantage of specific benefits associated with metal oxide resistive gas sensors (namely low cost and long lifetime), while working to overcome their widely known disadvantages (primarily poor response and recovery to sulfur-containing species and a lack of reproducibility from sensor to sensor). To accomplish this, an alternative sensor material was used that is highly sensitive to H2S without substantial response to other chemical species. During the course of Phase II metal oxide sensors were prepared not only in the proposed "chip-style", but also as planar sensors and microsensors (see section 3 for details). In addition, during the project period Synkera began developing low power, solid-state, electrochemical sensors for the detection of various species, one of which was H2S, so we applied this technology under this program. The sensors developed by Synkera are applicable to a number of different traditional instrumentation platforms, including fixed and portable systems such as those found throughout today's chemical workplace. In addition, Synkera has developed a "Smart H2S Card" for personal monitoring, built around the solid-state electrochemical sensors developed under this program.
Gas-detectors; Gases; Monitoring-systems; Monitors; Exposure-levels; Toxic-gases; Lung-irritants; Respiratory-irritants; Chemical-properties; Flammable-gases; Sulfides
Final Grant Report
NTIS Accession No.
National Institute for Occupational Safety and Health
Nanomaterials Research LLC