Chemical Effects in Organic Electronics

Chen, Hang; Josowicz, and Mira; Janata, Jiřı́; Potje‐Kamloth, Karin

doi:10.1021/cm040101m

Cited by 26 publications

(15 citation statements)

References 69 publications

(103 reference statements)

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“…In the OFET structure, silicon serves as the OFET ''gate'' electrode and the current passes through the conducting polymer ( Figure 8.2b), which encounters at least three resistances: two at the contacts and one in the conducting polymer, which is very similar to the Schottky diode arrangement. The chemical modulation of work function and the perpendicular electric field for |V G | > 0 affect all of these resistances in a highly nonlinear manner [25,40], which indeed shows a ''voltage-dependent resistor'' behavior. It is obvious that, because of the low mobility of the charge carriers in conducting polymers, the polarization space charge region (expressed as polarization resistance R P ) is created by the depletion of the charge carriers at the vicinity of the drain electrode, analogous to the formation of a diffusion depletion layer in the electrochemical experiment.…”

Section: Ofets -Field-modulated Chemiresistorsmentioning

confidence: 99%

“…It should be noted that semiconductor junction gas sensors are strongly related to the nature of the interfacial electronic structure of the Schottky barrier [25]. An extensive review on the properties of conducting polymer Schottky barrier junction and their sensor applications is given in [26].…”

Section: Contact Resistance Changes (Schottky Barrier)mentioning

confidence: 99%

“…It is obvious that, because of the low mobility of the charge carriers in conducting polymers, the polarization space charge region (expressed as polarization resistance R P ) is created by the depletion of the charge carriers at the vicinity of the drain electrode, analogous to the formation of a diffusion depletion layer in the electrochemical experiment. It has been shown that the effect of gate voltage on the modulation of the contact resistance of the drain electrode greatly exceeds the modulation of the interfacial conductivity of the organic semiconductor itself [25,38,41], and the device functions as a field-modulated junction.…”

Section: Ofets -Field-modulated Chemiresistorsmentioning

confidence: 99%

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Gas Sensing with Conducting Polymers

Potje‐Kamloth

2010

Electropolymerization

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IntroductionConducting polymers belong to the group of organic semiconductors. They have received considerable attention recently owing to their numerous potential applications in electronic components such as Schottky diodes [1], field-effect transistors (FETs) [2], and electroluminescent diodes [3,4]. Because of the inherent flexibility of organics and their relative ease of processing, as well as the easy tunability of electric properties by means of chemical substitutions, these materials provide new avenues in the development of electronic devices. Furthermore, these materials exhibit a particularity concerning their interaction with gases and vapors [5]. Interacting electrically neutral gas molecules can donate/accept fractional electronic charge, thereby changing the electronic properties of the matrix. The modulation of electrical properties of polymers upon interaction with gas depends on the type of the conducting polymer.The following sections give an overview of the basic properties of conducting polymers that are required to understand the operation of conducting polymer-based gas sensors. The mechanism of interactions between conducting polymers and gas or vapor species that is used as a transduction principle in gas sensors is discussed. Examples of the gas-sensing properties of conducting polymer gas sensors are given. They show how experimental and structural parameters of conducting polymers can influence the sensor characteristics. Electronic Properties of Conducting PolymersPolymers are typically associated with flexible, processible materials having electrically insulating properties. Although this is true of most polymers, a special class of these materials called conjugated polymers has the electrical and optical properties traditionally associated with metals and semiconductors, yet they retain the mechanical properties and the processibility of plastics [6]. Conjugated polymers Electropolymerization: Concepts, Materials and Applications. Edited by Serge Cosnier and Arkady Karyakin

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Section: Ofets -Field-modulated Chemiresistorsmentioning

confidence: 99%

Section: Contact Resistance Changes (Schottky Barrier)mentioning

confidence: 99%

Section: Ofets -Field-modulated Chemiresistorsmentioning

confidence: 99%

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Gas Sensing with Conducting Polymers

Potje‐Kamloth

2010

Electropolymerization

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“…The bulk, surface and interface impedance are connected in parallel. This is then connected to the contact impedance is in series [48,49]. Since the devices operate in direct current mode, the capacitance need not be taken into consideration (Fig.…”

Section: Sensor Response Characteristics Conjugated Molecule Sensorsmentioning

confidence: 99%

Organic Molecule Based Sensor for Aldehyde Detection

Mallya

Ramamurthy

2015

Smart Sensors, Measurement and Instrumentation

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Abstract. Aldehydes are used in food and beverage industries, production of resins, soap and perfume industries. When used in excess quantity or found in products in undesired quantity this is a threat to humans. Hence it becomes very important to detect these VOCs even at lower concentration. The other sources of aldehyde are polluted air and water. Exposure to aldehyde can cause gene mutation and cancer. Conductometric sensors with metal oxide semiconductors as sensing films, cataluminesence based sensors, quartz crystal microbalance sensors, analytical methods such as HPLC have been used for the detection of aldehydes. These are sophisticated techniques require skilled staff to perform the tests. Chemiresistor is a simple method of fabrication of conductometric sensor. In this method the sensing layer is a film cast between two electrodes deposited on an insulating substrate. The response of the sensor to various analytes is monitored by recording the changes taking place in the sensing element. Organic molecule based sensors are low cost and operate at room temperature. Selectivity of the sensors to a particular analyte is an issue in sensors. An analyte molecule can interact with the various binding sites on a molecule. A molecule has to be designed and synthesized to be selective to a particular analyte of interest. This can be achieved by selecting a molecule which has a functional group that interacts with the analyte molecule. The mechanism of interaction of the analyte with the sensing molecule can be understood by doing molecular simulations. Molecular modelling allows monitoring the interaction of the analyte and sensing molecule. Here an example of organic molecule based sensor for selective interaction with aldehydes is illustrated.The organic molecule ophenylenediamine blended with carbon black as sensing element of the chemiresistor to decrease the resistance. Molecular modelling can be used to understand the interaction between aldehyde and o-phenylenediamine molecule.

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“…The equivalent circuit in Fig. 1 can be used to describe a general organic electronic device [6]. In our case it can be simplified into the following mathematic model with the complex impedance Z:…”

Section: Feature Extractionmentioning

confidence: 99%