{"id":5771,"date":"2022-05-27T08:59:38","date_gmt":"2022-05-27T00:59:38","guid":{"rendered":"https:\/\/sites.gtiit.edu.cn\/research\/?post_type=mec-events&p=5771"},"modified":"2022-06-06T09:42:05","modified_gmt":"2022-06-06T01:42:05","slug":"20220624","status":"publish","type":"mec-events","link":"https:\/\/sites.gtiit.edu.cn\/research\/events\/20220624\/","title":{"rendered":"Chemiresistive Sensors for Application in Aqueous Environments"},"content":{"rendered":"

Title<\/strong><\/span><\/p>\n

Chemiresistive Sensors for Application in Aqueous Environments<\/strong><\/p>\n

Speaker<\/span><\/strong><\/p>\n

Prof. Peter Kruse<\/strong> (McMaster University, Canada)<\/p>\n

Host<\/span><\/strong><\/p>\n

Prof. Kai Huang<\/strong> (GTIIT, Chemistry)<\/p>\n

Time and Location<\/span><\/strong><\/p>\n

Jun. 24 2022, Friday, 9:00am-10:00am(China Time),\u00a0 E211 (Education Building, 2nd floor)<\/p>\n

Language<\/span><\/strong><\/p>\n

English<\/p>\n

Zoom Link<\/span><\/strong><\/p>\n

https:\/\/gtiit.zoom.us\/j\/94609938903<\/p>\n

Abstract<\/strong><\/span><\/p>\n

Chemiresistors are solid state\u00a0devices that change their electronic properties as a result of chemical\u00a0interactions\u00a0with their environment. They are a well-established and widely\u00a0commercialized technology for gas or vapor sensor\u00a0applications. Water quality\u00a0sensors are a surprisingly underserved area of sensor applications. Important\u00a0chemical\u00a0water quality parameters include pH, dissolved gases, common ions and\u00a0a range of toxic trace contaminants which\u00a0may be ionic or uncharged, inorganic\u00a0or organic. They are usually monitored using colorimetric or electrochemical\u00a0sensors, and large lab-based instruments. These methods suffer from high\u00a0maintenance, need for reagents, high\u00a0power needs, or inability to operate\u00a0autonomously and continuously. Chemiresistors have the potential to eliminate\u00a0all these disadvantages, but there has been slow progress in adapting them to\u00a0aqueous analytes. Challenges\u00a0include the need to prevent electrical shorts\u00a0through the aqueous medium and the need to keep the sensing voltage\u00a0low enough\u00a0to avoid electrochemical reactions at the sensor. The active sensor elements in\u00a0our devices consist of a\u00a0percolation network of low-dimensional materials\u00a0particles that form a conducting film, e. g. from carbon nanotubes,\u00a0pencil\u00a0trace, and different forms of graphene or graphene oxide. These networks can be\u00a0made selective by 3\u00a0principal approaches: (1) by introduction of chemical\u00a0defects into the network itself, (2) by functionalizing the\u00a0network with\u00a0switchable dopant molecules, or (3) by coating the network with selective\u00a0membranes. After\u00a0demonstrating free chlorine sensors using the second approach,\u00a0we have also introduced pH sensors and ion\u00a0sensors. While there are some\u00a0challenges associated with expanding the range of accessible analytes, we have\u00a0recently exploited all three principal approaches to expand the applicability\u00a0of our platform, in particular to anions\u00a0and cations.<\/p>\n

Biography<\/strong><\/span><\/p>\n

Dr. Peter Kruse is a Full Professor of Chemistry at McMaster University in Canada. He completed his Diploma in Physical Chemistry from Friedrich Schiller University Jena in Germany in 1995. His undergraduate experience also included a year abroad, spent at the University of Strathclyde in the UK and work placements at Wellcome Research Laboratories in the UK (synthesizing antiviral drug candidates) and at IMEC in Belgium (optimizing cleaning procedures for silicon wafers). His undergraduate thesis on \u201c1H and\u00a013C nuclear spin\u00a0relaxation of liquid methyliodide: Separation of inter- and intramolecular contributions.\u201d was completed under supervision of Prof. Karl-Ludwig Oehme. He started graduate school with Prof. Phillip Kash at the University of British Columbia in Canada, but then moved to the University of California, San Diego in the USA to complete his PhD thesis on \u201cReactions\u00a0of oxygen on GaAs(100)\u201d in 2000 under supervision of Prof. Andrew Kummel. He then worked for two years as a postdoctoral fellow with Drs. Robert Wolkow, Dan Wayner and Gregory Lopinski at the Steacie Institute of the National Research Council of Canada, using scanning tunneling microscopy to study the adsorption of small organic molecules on silicon surfaces. In 2002, he joined the Department of Chemistry at McMaster University in Canada as a full-time faculty member. Research in the Kruse group over the last 20\u00a0years has spanned chemical doping of carbon nanotubes,\u00a0corrosion inhibition on\u00a0steel, mobility at interfaces, anodic pattern formation in electrochemistry, 2D\u00a0materials and chemiresistive sensors.<\/p>\n","protected":false},"excerpt":{"rendered":"

Title Chemiresistive Sensors for Application in Aqueous Environments Speaker Prof. Peter Kruse (McMaster University, Canada) Host Prof. Kai Huang (GTIIT, Chemistry) Time and Location Jun. 24 2022, Friday, 9:00am-10:00am(China Time),\u00a0 E211 (Education Building, 2nd floor) Language English Zoom Link https:\/\/gtiit.zoom.us\/j\/94609938903 Abstract Chemiresistors are solid state\u00a0devices that change their electronic properties as a result of chemical\u00a0interactions\u00a0with […]<\/p>\n","protected":false},"author":182,"featured_media":5764,"comment_status":"closed","ping_status":"closed","template":"","mec_category":[303],"mec_speaker":[341],"_links":{"self":[{"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/mec-events\/5771"}],"collection":[{"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/mec-events"}],"about":[{"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/types\/mec-events"}],"author":[{"embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/users\/182"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/comments?post=5771"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/media\/5764"}],"wp:attachment":[{"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/media?parent=5771"}],"wp:term":[{"taxonomy":"mec_category","embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/mec_category?post=5771"},{"taxonomy":"mec_speaker","embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/research\/wp-json\/wp\/v2\/mec_speaker?post=5771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}