Low-Threshold Field Emission Cathode Based on Heat-Treated Dehydrofluorinated Polyvinylidene Fluoride

Streletskiy, Oleg A.; Zavidovskiy, Ilya A.; Nishchak, O. Yu.; Хайдаров, А. А.; Савченко, Н Ф; Pavlikov, A. V.

doi:10.1134/s106377612212010x

Cited by 5 publications

(7 citation statements)

References 68 publications

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“…As the Raman spectroscopy has finite analysis depth [45], a prominent variation between the spectra of precursor and the resulting material may indicate the subsurface layers of the polyyne-polyene being dehydrohalogenated better than deeper layers, thus confirming the studies of PVDF dehydrofluorination using similar techniquea [18]. The line at 2160 cm −1 is attributed to the vibration of sp-hybridized chains [37][38][39], while the lines at higher wavelengths of 2330, 2470, 2670, and 3070 cm −1 are related to the overtones of the discussed fundamental lines, corresponding to the second order of ν1 (denoted as 2×ν1), a weak overtone of ν1 and cis-ν1 (indicated as ν1+cis-ν1), an overtone of ν1 and ν2 (ν1+ν2), the second order of ν2 (2×ν2), respectively. The location of ν1 at 1160 cm −1 and ν1+cis-ν1 positioning at 2470 cm −1 indicates that the contribution of cis-ν1 is centered at approximately 1310 cm −1 , which is somewhat distant from the position of 1250 cm −1 observed for cis-polyacetylene [49], though, the position can be shifted to higher wavelengths for short and defected chain fragments.…”

Section: Raman Spectroscopymentioning

confidence: 53%

“…The line at 2160-2170 cm −1 is attributed to the stretching vibrations of C≡C bonds [37][38][39]. Its emergence in the FTIR is related to the violation of the exclusion principle between Raman and FTIR spectra, which is typical for long-bended chains [40], while the observed peak position indicates that sp-hybridized fragments comprise a single C≡C bond [41].…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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The Field-Effect Transistor Based on a Polyyne–Polyene Structure Obtained via PVDC Dehydrochlorination

et al. 2023

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We report on the formation of the field-effect transistor based on a polyyne–polyene structure. Polyvinylidene chloride (PVDC) drop casting and its subsequent dehydrochlorination in KOH solution allowed for the formation of porous polyyne–polyene material, which was analyzed via transmission electron microscopy, Fourier-transform infrared spectroscopy, and Raman spectroscopy, revealing the presence of sp- and sp2-hybridized chained fragments in the structure. The polyyne–polyene-based field-effect transistor showed a transconductance of 3.2 nA/V and a threshold voltage of −0.3 V. The obtained results indicate that polyyne–polyene-based transistors can be used as discrete elements of molecular electronics and that subsequent studies can be aimed toward the development of selective polyyne–polyene-based gas sensors with tunable sensitivity.

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Section: Raman Spectroscopymentioning

confidence: 53%

Section: Ftir Spectroscopymentioning

confidence: 99%

The Field-Effect Transistor Based on a Polyyne–Polyene Structure Obtained via PVDC Dehydrochlorination

et al. 2023

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“…The number of charge carriers within the polymer rises as a result of this electron transfer, improving electrical conductivity. In CPs of the n-type, this effect is particularly noticeable [60,176,177]. Agbor et al have described the use of Langmuir-Blodgett films comprising PANI for sensing NO 2 and H 2 S gases.…”

Section: Cps In Plasmonic Sensorsmentioning

confidence: 99%

Plasmonic gas sensors based on nanomaterials: mechanisms and recent developments

Vaidyanathan,

Mondal,

Rout

et al. 2024

J. Phys. D: Appl. Phys.

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Sensing devices for rapid analytics are important societal requirements, with wide applications in environmental diagnostics, food testing, and disease screening. Nanomaterials present excellent opportunities in sensing applications owing to their superior structural strength, and their electronic, magnetic, and optoelectronic properties. Among the various mechanisms of gas sensing, including chemiresistive sensors, electrochemical sensors, and acoustic sensors, another promising area in this field involves plasmonic sensors. The advantage of nanomaterial-plasmonic sensors lies in the vast opportunities for tuning the sensor performance by optimizing the nanomaterial structure, thereby producing highly selective and sensitive sensors. Recently, several novel plasmonic sensors have been reported, with various configurations such as nanoarray resonator-, ring resonator-, and fiber-based plasmonic sensors. Going beyond noble metals, some promising nanomaterials for developing plasmonic gas sensor devices include two-dimensional materials, viz. graphene, transition metal dichalcogenides, black phosphorus, blue phosphorus, and MXenes. Their properties can be tuned by creating hybrid structures with layers of nanomaterials and metals, and the introduction of dopants or defects. Such strategies can be employed to improve the device performance in terms of its dynamic range, selectivity, and stability of the response signal. In this review, we have presented the fundamental properties of plasmons that facilitate its application in sensor devices, the mechanism of sensing, and have reviewed recent literature on nanomaterial-based plasmonic gas sensors. This review briefly describes the status quo of the field and future prospects.

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“…The The spectrum of dh-PVDC (red line in Figure 3) shows relatively wide lines at 1160, 1560 and 2170 cm −1 . These lines are related to the vibrations of the C-C and of trans-isomeric polyenic structures [21], C=C of various carbon-based materials including disordered carbon and polyenes [8], and the vibrations of C≡C bonds [22][23][24], respectively. The plateau at 1210-1460 cm −1 is mainly attributed to the contribution of the D-line related to the breathing mode of sp 2 -hybridized clusters [25].…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The band positioned at 2160-2170 cm −1 is ascribed to C≡C bonding [22][23][24]. It is active both in FTIR and in Raman spectra, which is caused by the violation of the exclusion principle taking place for long bended chains [39].…”

Section: Ftirmentioning

confidence: 99%

Resistive Gas Sensors Based on Porous Sp-Containing Films Obtained by Dehydrohalogenation of PVDC and PVDC-PVC Copolymer

Streletskiy,

Zavidovskiy,

Nuriahmetov

et al. 2023

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Resistive sensing responses of the thin films obtained by dehydrohalogenation of polyvinylidene chloride (PVDC) and polyvinylidene chloride–polyvinyl chloride (PVDC-PVC) copolymer were investigated. The structure of the samples was studied by transmission electron microscopy, Fourier-transform infrared spectroscopy and Raman spectroscopy. The analyses demonstrate the formation of a porous structure based on polyyne–polyene chains. The formation of a foam-like oxidized sp-rich structure was observed for the samples obtained via the chemical treatment of the PVDC. However, a loose film with a developed structure and a lower fraction of sp-hybridized carbon was observed for KOH-treated PVDC-PVC. The resistive sensing responses of both of the dehydrohalogenated structures were measured for various concentrations of acetone, acetic acid, ammonia hydroxide, methanol, ethanol, benzene and water. The interplay between the efficiency of the dehydrohalogenation of the films, their structure and sensing selectivity is discussed.

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Low-Threshold Field Emission Cathode Based on Heat-Treated Dehydrofluorinated Polyvinylidene Fluoride

Cited by 5 publications

References 68 publications

The Field-Effect Transistor Based on a Polyyne–Polyene Structure Obtained via PVDC Dehydrochlorination

The Field-Effect Transistor Based on a Polyyne–Polyene Structure Obtained via PVDC Dehydrochlorination

Plasmonic gas sensors based on nanomaterials: mechanisms and recent developments

Resistive Gas Sensors Based on Porous Sp-Containing Films Obtained by Dehydrohalogenation of PVDC and PVDC-PVC Copolymer

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