Conductance quantization as a new selective sensing mechanism in dendritic point contacts

Kamarchuk, G. V.; Pospelov, А. P.; Savytskyi, A.; Herus, Anna; Doronin, Yurii S.; Vakula, V. L.; Faulques, Eric

doi:10.1007/s42452-019-0241-x

Cited by 18 publications

(44 citation statements)

References 25 publications

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“…The operation of point-contact sensors is in line with the principles of Yanson point-contact spectroscopy [ 3 , 6 ]. Point-contact sensors exhibit quantum properties during the detection of various objects and enable new detection mechanisms [ 4 , 10 ]. The quantum properties of the point-contact sensors enable the measurement of the breath spectral profiles, which contain comprehensive information about this complex gas medium [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

“…In sensor studies, the quantum properties of Yanson point contacts solve the problems that could not be solved when analogues were used to measure the variation in electrical conductance. This can be exemplified by the new quantum mechanism of selective detection in gaseous and liquid media [ 10 ] and by the possibility of real-time detection of carcinogenic strains of Helicobacter pylori [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Quantum detection offers several possibilities to find and implement new mechanisms to selectively detect various substances. Therefore, it has the potential to become a breakthrough approach [ 4 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Selective detection of complex gas mixtures using point contacts: concept, method and tools

Pospelov¹,

Belan²,

Harbuz³

et al. 2020

Beilstein J. Nanotechnol.

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Of all modern nanosensors using the principle of measuring variations in electric conductance, point-contact sensors stand out in having a number of original sensor properties not manifested by their analogues. The nontrivial nature of point-contact sensors is based on the unique properties of Yanson point contacts used as the sensing elements. The quantum properties of Yanson point contacts enable the solution of some of the problems that could not be solved using conventional sensors measuring conductance. In the present paper, we demonstrate this by showing the potential of quantum point-contact sensors to selectively detect components of a gas mixture in real time. To demonstrate the high efficiency of the proposed approach, we analyze the human breath, which is the most complex of the currently known natural gas mixtures with extremely low concentrations of its components. Point-contact sensors allow us to obtain a spectroscopic profile of the mixture. This profile contains information about the complete set of energy interactions occurring in the point contact/breath system when the breath constituents adsorb to and desorb from the surface of the point-contact conduction channel. With this information we can unambiguously characterize the analyzed system, since knowing the energy parameters is key to successfully identifying and modeling the physicochemical properties of various quantum objects. Using the point-contact spectroscopic profile of a complex gas mixture it is possible to get a functional dependence of the concentration of particular breath components on the amplitude of the sensor output signal. To demonstrate the feasibility of the proposed approach, we analyze the point-contact profiles from the breath of several patients and compare them with the concentrations of serotonin and cortisol in the body of each patient. The obtained results demonstrate that the proposed methodology allows one to get an effective calibration function for a non-invasive analysis of the level of serotonin and cortisol in the human body using the point-contact breath test. The present study indicates some necessary prerequisites for the design of fast detection methods using differential sensor analysis in real time, which can be implemented in various areas of science and technology, among which medicine is one of the most important.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selective detection of complex gas mixtures using point contacts: concept, method and tools

Pospelov¹,

Belan²,

Harbuz³

et al. 2020

Beilstein J. Nanotechnol.

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“…Due to quantum nature of their electric properties Yanson point contacts are able to record fine variations of superficial states of the point contact conductivity channel which are caused with adsorption of an external agent. The registration procedure is performed with the highest possible resolution of one conductivity quantum which is equal to addition of one atom to the point-contact channel [28,29]. This makes it possible to record response signals of a spectral type by point-contact sensors [14,19].…”

Section: Methodsmentioning

confidence: 99%

Surface morphology features of point contact gas sensors based on Cu-TCNQ compound

Harbuz

Pospelov

Gudimenko

et al. 2021

Molecular Crystals and Liquid Crystals

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The 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion salt compound was used as the sensitive material of gas point contact sensors. The phase composition and surface morphology of the obtained sensor films were established. It was found correlation between surface morphology of the point-contact transducer and definite type of the sensor response curve observed under action of the human breath gas. If the sensor sample is formed from numerical crystals of the same or similar sizes having a uniform shape, similar to a shell, and clearly defined external borders it indicates to the creation of defect-free Yanson point contacts in the process of soft electrochemical synthesis. As a result, the surface of the sensor is a complex multistructure of a numerous number of Yanson point contacts, which generates a large output signal from the sensor in response to the action of the analyte. When crystals of Cu-TCNQ compound forming samples under investigation have lower density, large size, distorted and full of fractures boundaries, it prevents the formation of high-quality point contacts. These morphologic peculiarities are typical for samples with low level of response signal. In the case of extremely low density of Cu-TCNQ crystals observed in the sample surface the sample does not show any response to the action of the human breath gas.

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“…Селективний квантовий сенсор на основі ефекту електрохімічної точково-контактної комутації має широкі перспективи і значні переваги в порівнянні з існуючими на сьогоднішній день пристроями для диференціального аналізу рідких і газоподібних середовищ [1,2]. Принцип дії квантового сенсора базується на тому, що під час циклічної точково-контактної комутації [3,4]…”

Section: вступunclassified

Resistive properties of Janson’s point contacts in the conditions of polarization inversion

Pospelov¹,

Kamarchuk²,

Сахненко³

et al. 2021

Вісник НТУ "ХПІ"

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The sensitive element of a new quantum sensor generation is the Janson dendritic point contact. Analytes that are in the space surrounding the sensitive element are able to interact with the freshly formed surface of the conduction channel of the Janson quantum point contact, as well as with the surface of the dendrite during its growth. This interaction provides the influence of the substances under study on the configuration of the output characteristic of the sensor, represented by the system conductivity histogram. The conductivity histogram is built on the basis of the chrono-resistogram of the self-oscillating point-contact cyclic switchover effect, which is directly recorded under self-oscillation conditions. In the structure of the sensor element, Janson's dendritic point contact is immersed in an electrolyte and in an electric field forms a chrono-resistogram, which depends on the environment composition. The paper considers one of the aspects of such chrono-resistograms formation. The features of a gapless electrochemical system in the process of realizing the point-contact cyclic switchover effect are analyzed. Modeling the sensitive element in the form of a gapless electrode system allowed explaining the mechanism and dynamics of the transition “Janson point contact – dendrite and counter electrode in the electrolyte”. The most important parameter of the gapless electrode system is the coordinate of the polarization inversion boundary. It is shown that the idea of the coordinate of the polarization inversion boundary plays a fundamental role in modeling the resistive properties of a point-contact system and its lifetime. The synthesized mathematical models describe well the experimentally obtained dependences of the resistance on the exposure time of the nanostructure in an electric field. It was found that the dependence of the contact resistance on the exposure time, obtained under the assumption of a linear distribution of the anodic polarization along the main axis of the conduction channel, is described by a differential equation in which the growth rate of resistance is directly proportional to the cube of this resistance. The materials obtained make it possible to purposefully optimize the design parameters and operating conditions of sensor devices based on Janson point contacts for the analysis of complex gaseous and liquid mixtures.

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Conductance quantization as a new selective sensing mechanism in dendritic point contacts

Cited by 18 publications

References 25 publications

Selective detection of complex gas mixtures using point contacts: concept, method and tools

Selective detection of complex gas mixtures using point contacts: concept, method and tools

Surface morphology features of point contact gas sensors based on Cu-TCNQ compound

Resistive properties of Janson’s point contacts in the conditions of polarization inversion

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