{"id":3613,"date":"2011-07-08T19:25:43","date_gmt":"2011-07-08T19:25:43","guid":{"rendered":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/?p=3613"},"modified":"2011-07-19T20:48:23","modified_gmt":"2011-07-19T20:48:23","slug":"microsphere-templated-nanostructured-gas-sensors-2","status":"publish","type":"post","link":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/microsphere-templated-nanostructured-gas-sensors-2\/","title":{"rendered":"Microsphere Templated Nanostructured Gas Sensors"},"content":{"rendered":"
\"Figure<\/a>

Figure 1: SEM, TEM, HR-TEM and SAED images of microsphere template InGaZnO3, illustrating a short range order of the spheres and amorphous phase of the sensor film.<\/p><\/div>\n

Gas sensors are essential in the monitoring, control, and reduction of harmful emissions in the environment [1<\/a>] <\/sup>.\u00a0 Conductometric gas sensors based on semiconducting metal oxides are advantageous in many applications due to high sensitivity, manufacturability, and small size.\u00a0 However, there are a number of drawbacks, including difficulty in control over the semiconductor\/substrate interface, high power consumption, and reduced selectivity at high temperatures (300-400\u02daC) required for operation [2<\/a>] <\/sup> [3<\/a>] <\/sup>.\u00a0 To address these challenges, chemical sensors comprising a wide array of material composition and morphology have been fabricated and investigated via high-throughput combinatorial test procedures.\u00a0 A microsphere templating technique is employed in all device structures; it reduces the area of contact with underlying substrate and enhances interaction with the surrounding gases [4<\/a>] <\/sup>.\u00a0 Sensor performance has been characterized and optimized through controlled variation in the volume fraction of Pt nanoparticles that are co-deposited on the surface of SnO2<\/sub> and ZnO thin films.\u00a0 In addition, novel sensors based on amorphous InGaZnO4<\/sub> have been investigated under a wide range of operating conditions and show promise for heightened sensitivity at reduced operating temperatures.\u00a0 With a combination of rapid testing procedures and physical models of chemical and electronic processes involved in gas sensing, further advancements are anticipated in device sensitivity, selectivity, and response time.<\/p>\n<\/div>

  1. F. Rock, N. Barsan, and U. Weimar ., \u201cElectronic nose: Current status and future trends,\u201d Chemical Reviews, <\/em>vol. 108, no. 2, pp. 705-725, Jan. 2008. [↩<\/a>]<\/li>
  2. K. J. Albert, N. S. Lewis, C.L. Schauer, G. A. Sotzing, S. E. Stitzel, T. P. Vaid, and D. R. Walt., \u201cCross-reactive chemical sensor arrays,\u201d Chemical Reviews<\/em>, vol. 100, no. 7, pp. 2595-2626, June 2000. [↩<\/a>]<\/li>
  3. K. Wiesner, H. Knozinger,\u00a0\u00a0 M. Fleischer, H.\u00a0Meixner, \u201cWorking mechanism of an ethanol filter for selective high-temperature methane gas sensors,\u201d IEEE Sensors Journal<\/em>, vol. 2, no. 4, pp. 354-359, Aug. 2002. [↩<\/a>]<\/li>
  4. I. D. Kim, A. Rothschild, T.Hyodo, and H. L. Tuller,, \u201cMicrosphere templating as means of enhancing surface activity and gas sensitivity of CaCu3<\/sub>Ti4<\/sub>O12<\/sub> thin films,\u201d Nano Letters<\/em>, vol. <\/em>6, no. 2, pp. 193-198, Jan. 2006. [↩<\/a>]<\/li><\/ol>","protected":false},"excerpt":{"rendered":"

    Gas sensors are essential in the monitoring, control, and reduction of harmful emissions in the environment [1] .\u00a0 Conductometric gas…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[28,5528,6083],"tags":[4139,70],"_links":{"self":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3613"}],"collection":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/comments?post=3613"}],"version-history":[{"count":3,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3613\/revisions"}],"predecessor-version":[{"id":4182,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/posts\/3613\/revisions\/4182"}],"wp:attachment":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/media?parent=3613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/categories?post=3613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2011\/wp-json\/wp\/v2\/tags?post=3613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}