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Patent Issued for Electro-Chemical Sensors, Sensor Arrays and Circuits

July 23, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- A patent by the inventors Katz, Howard E. (Owings Mill, MD); Kong, Hoyoul (Timonium, MD), filed on December 21, 2012, was published online on July 8, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8772764 is assigned to The Johns Hopkins University (Baltimore, MD).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The field of the currently claimed embodiments of this invention relates to electro-chemical sensors, and more particularly to electro-chemical sensors that have analyte-responsive semiconductors.

"In recent years, various chemical sensors based on organic field effect transistors (OFETs) have been proposed and investigated, as they possess advantages of easy tuning of the chemical and physical properties, low-cost processing, and flexible mechanical properties..sup.1,2 Most OFETs exposed to various chemical compounds such as polar solvents including water vapor, and particularly, nitroaromatic explosives, showed decreased output current and mobility..sup.1,3-11 The degradation of the transistor performance by exposure to the chemical compounds was caused by reduced charge transport dipoles causing charge trapping at grain boundaries..sup.1,5

"However, even though many organic semiconductors have been shown to result in current decreases when environmental agents contact them as voltage is applied, they have limited specificity since the responses are similar. Also, the absolute current level is limited to the non-exposed state. There thus remains a need for improved electro-chemical sensors.

"References for Background Section

"(1) See, K. C.; Becknell, A.; Miragliotta, J.; Katz, H. E. Adv Mater 2007, 19, 3322.

"(2) Torsi, L.; Tanese, M. C.; Cioffi, N.; Gallazzi, M. C.; Sabbatini, L.; Zambonin, P. G.; Raos, G.; Meille, S. V.; Giangregorio, M. M. J Phys Chem B 2003, 107, 7589.

"(3) Huang, J.; Miragliotta, J.; Becknell, A.; Katz, H. E. J Am Chem Soc 2007, 129, 9366.

"(4) Huang, J.; Sun, J.; Katz, H. E. Adv Mater 2008, 20, 2567.

"(5) Huang, J.; Dawidczyk, T. J.; Jung, B. J.; Sun, J.; Mason, A. F.; Katz, H. E. J Mater Chem 2010, 20, 2644.

"(6) Royer, J. E.; Lee, S.; Chen, C.; Ahn, B.; Trogler, W. C.; Kanicki, J.; Kummel, A. C. Sensor Actuat B-Chem 2011, 158, 333.

"(7) Zhu, Z. T.; Mason, J. T.; Dieckmann, R.; Malliaras, G. G. Appl Phys Lett 2002, 81, 4643.

"(8) Li, D. W.; Borkent, E. J.; Nortrup, R.; Moon, H.; Katz, H.; Bao, Z. N. Appl Phys Lett 2005, 86.

"(9) Crone, B.; Dodabalapur, A.; Gelperin, A.; Torsi, L.; Katz, H. E.; Lovinger, A. J.; Bao, Z. Appl Phys Lett 2001, 78, 2229.

"(10) Chang, J. B.; Liu, V.; Subramanian, V.; Sivula, K.; Luscombe, C.; Murphy, A.; Liu, J. S.; Frechet, J. M. J. J. Appl. Phys. 2006, 100.

"(11) Torsi, L.; Marinelli, F.; Angione, M. D.; Dell'Aquila, A.; Cioffi, N.; De Giglio, E.; Sabbatini, L. Org Electron 2009, 10, 233."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "An electro-chemical sensor according to an embodiment of the current invention includes a first electrode, a second electrode spaced apart from the first electrode, and a semiconductor channel in electrical contact with the first and second electrodes. The semiconductor channel includes a trapping material. The trapping material reduces an ability of the semiconductor channel to conduct a current of charge carriers by trapping at least some of the charge carriers to localized regions within the semiconductor channel. The semiconductor channel includes at least a portion configured to be exposed to an analyte to be detected, and the trapping material, when exposed to the analyte, interacts with the analyte so as to at least partially restore the ability of the semiconductor channel to conduct the current of charge carriers.

"An electro-chemical sensor array according to an embodiment of the current invention includes a plurality of electro-chemical sensor elements. At least one electro-chemical sensor element of the plurality of electro-chemical sensor elements includes a first electrode, a second electrode spaced apart from the first electrode, and a semiconductor channel in electrical contact with the first and second electrodes. The semiconductor channel includes a trapping material. The trapping material reduces an ability of the semiconductor channel to conduct a current of charge carriers by trapping at least some of the charge carriers to localized regions within the semiconductor channel. The semiconductor channel includes at least a portion configured to be exposed to an analyte to be detected, and the trapping material, when exposed to the analyte, interacts with the analyte so as to at least partially restore the ability of the semiconductor channel to conduct the current of charge carriers.

"An electrical circuit according to an embodiment of the current invention includes an electro-chemical sensor element. The electro-chemical sensor element includes a first electrode, a second electrode spaced apart from the first electrode, and a semiconductor channel in electrical contact with the first and second electrodes. The semiconductor channel includes a trapping material. The trapping material reduces an ability of the semiconductor channel to conduct a current of charge carriers by trapping at least some of the charge carriers to localized regions within the semiconductor channel. The semiconductor channel includes at least a portion configured to be exposed to an analyte to be detected, and the trapping material, when exposed to the analyte, interacts with the analyte so as to at least partially restore the ability of the semiconductor channel to conduct the current of charge carriers."

URL and more information on this patent, see: Katz, Howard E.; Kong, Hoyoul. Electro-Chemical Sensors, Sensor Arrays and Circuits. U.S. Patent Number 8772764, filed December 21, 2012, and published online on July 8, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8772764.PN.&OS=PN/8772764RS=PN/8772764

Keywords for this news article include: Electronics, Semiconductor, The Johns Hopkins University.

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Source: Electronics Newsweekly


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