Nanostructured organic–inorganic heterojunction diodes as gas sensors

Chowdhury, Avijit; Biswas, Bipul; Bera, Raghu Nath; Mallik, Biswanath

doi:10.1039/c2ra20758c

Cited by 22 publications

(11 citation statements)

References 42 publications

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“…[6][7][8][9] We can also cite phthalocyanines combined with ZnS. 10 Organic Schottky diodes were widely reported as gas sensors, 11 unlike heterojunctions combining two molecular materials. We can mention phthalocyanine-based p-n heterojunctions, 12 which behave electrically as classical p-n diodes, and a particular conductometric transducer, called MSDI, for Molecular Semiconductor -Doped Insulator heterojunction.…”

Section: The Low Conductive Electrodeposited Poly(25-dimethoxyaniline)mentioning

confidence: 99%

Low Conductive Electrodeposited Poly(2,5-dimethoxyaniline) as a Key Material in a Double Lateral Heterojunction, for Sub-ppm Ammonia Sensing in Humid Atmosphere

et al. 2019

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We present a new device called a double lateral heterojunction (DLH) as an ammonia sensor in humid atmosphere. It combines polyaniline derivatives in their poor conducting state with a highly conductive molecular material, lutetium bisphthalocyanine, LuPc2. Polyaniline and poly(2,5-dimethoxyaniline) are electrodeposited on ITO interdigitated electrodes, leading to an original device that can be obtained only by electrochemistry and not by other solution processing techniques. Both polymers lead to highly conducting materials that require a neutralization step before their coverage by LuPc2. While the device based on polyaniline shows ohmic behavior, the nonlinear I–V characteristics of the poly(2,5-dimethoxyaniline)-based DLH prove the existence of energy barriers at the interfaces, as demonstrated by impedance spectroscopy. It exhibits a particularly interesting sensitivity to ammonia, at room temperature and in a broad relative humidity range. Thanks to its higher energy barriers, the poly(2,5-dimethoxyaniline)/LuPc2 DLH is the most sensitive device with a limit of detection of 320 ppb. This work paves the way for the use of substituted polyanilines in conductometric sensors not only in the field of air quality monitoring but also in the field of health diagnosis by measurement in human breath.

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Section: The Low Conductive Electrodeposited Poly(25-dimethoxyaniline)mentioning

confidence: 99%

Low Conductive Electrodeposited Poly(2,5-dimethoxyaniline) as a Key Material in a Double Lateral Heterojunction, for Sub-ppm Ammonia Sensing in Humid Atmosphere

et al. 2019

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“…Otherwise, hollow nanostructures, particularly decorated with additional metal oxides showed enhanced gas sensing properties. [327][328][329][330] surface reactions involving adsorption, dissociation, and the ionization of oxygen. Furthermore, complex nanostructures with multiple functional compositions, such as combining C-coated and GN-based nanomaterials with noble metals (Au, Pt etc.)…”

Section: Preparation and Mechanism Of Lead-based Semiconductor Ncsmentioning

confidence: 99%

Recent advances in IV–VI semiconductor nanocrystals: synthesis, mechanism, and applications

et al. 2013

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This review is focused on the recent developments of the synthesis, mechanism and applications of IV-VI semiconductor nanocrystals (NCs), including germanium-, tin-and lead-based chalcogenides NCs. First of all, we systematically introduce a series of investigations on the preparation with controllable size and shape via a wide variety of methods. Corresponding growth mechanisms are also discussed. Moreover, the promising potential of IV-VI semiconductor NCs as building blocks with respect to energy, sensors and catalysis is highlighted. For the purpose of enhancing the performance to satisfy the practical applications, tailored nanocomposites by combining noble metals or graphene etc. are further developed. Finally, we present some concluding remarks and perspectives for future developments. We hope this article can provide researchers with the key snapshots of the recent advances and the future challenges, thus achieving a great progress in IV-VI semiconductor NCs.

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“…Such localized n-p heterojunctions can also be obtained by covering a nanostructured inorganic material by an organic semiconductor, e.g. with n-type ZnO nanowires or ZnS nanoparticles covered by a p-type MPc [49,50]. This method can be generalized, since it allows using every method to depose a nanostructured inorganic material, generally with a high temperature process (see chapter 2), then covering by an organic material using vacuum evaporation or some solution processing technique, depending on its solubility.…”

Section: Hybrid Materials Including Inorganic Materialsmentioning

confidence: 99%

Hybrid and 2D nanomaterials

Bouvet

2020

Advanced Nanomaterials for Inexpensive Gas Microsensors

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Nanostructured organic–inorganic heterojunction diodes as gas sensors

Cited by 22 publications

References 42 publications

Low Conductive Electrodeposited Poly(2,5-dimethoxyaniline) as a Key Material in a Double Lateral Heterojunction, for Sub-ppm Ammonia Sensing in Humid Atmosphere

Low Conductive Electrodeposited Poly(2,5-dimethoxyaniline) as a Key Material in a Double Lateral Heterojunction, for Sub-ppm Ammonia Sensing in Humid Atmosphere

Recent advances in IV–VI semiconductor nanocrystals: synthesis, mechanism, and applications

Hybrid and 2D nanomaterials

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