Sensing properties of two-component Langmuir–Blodgett layer and its porous derivative in SAW sensor for vapors of methanol and ethanol

Balcerzak, A.; Aleksiejuk, M.; Жавнерко, Г. К.; Agabekov, V. E.

doi:10.1016/j.tsf.2009.10.157

Cited by 21 publications

(16 citation statements)

References 14 publications

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“…The Langmuir-Blodgett technique is usually applied to form monolayers of amphiphilic molecules. Therefore, in attempts to use this method in gas-sensing applications, organic compounds such as porphyrin [68,69], benzenedicarboxylic acids [70], and polypyrrole [71] have been most frequently employed. Formation of TiO 2 or SnO 2 thin films is often associated with using precursors of metal oxides, e.g., titanium alkoxides [72], polianiline-TiO 2 [73] or complexes of metal salts of fatty acid or amines, e.g., ODA-stannate complexes [74], or ODA-KTiO 2 [75].…”

Section: Discussionmentioning

confidence: 99%

SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

Nowak

Maziarz

Rydosz

et al. 2020

Sensors

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Thin-film n-n nanoheterostructures of SnO2/TiO2, highly sensitive to NO2, were obtained in a two-step process: (i) magnetron sputtering, MS followed by (ii) Langmuir-Blodgett, L–B, technique. Thick (200 nm) SnO2 base layers were deposited by MS and subsequently overcoated with a thin and discontinuous TiO2 film by means of L–B. Rutile nanopowder spread over the ethanol/chloroform/water formed a suspension, which was used as a source in L–B method. The morphology, crystallographic and electronic properties of the prepared sensors were studied by scanning electron microscopy, SEM, X-ray diffraction, XRD in glancing incidence geometry, GID, X-ray photoemission spectroscopy, XPS, and uv-vis-nir spectrophotometry, respectively. It was found that amorphous SnO2 films responded to relatively low concentrations of NO2 of about 200 ppb. A change of more than two orders of magnitude in the electrical resistivity upon exposure to NO2 was further enhanced in SnO2/TiO2 n-n nanoheterostructures. The best sensor responses RNO2/R0 were obtained at the lowest operating temperatures of about 120 °C, which is typical for nanomaterials. Response (recovery) times to 400 ppb NO2 were determined as a function of the operating temperature and indicated a significant decrease from 62 (42) s at 123 °C to 12 (19) s at 385 °C A much smaller sensitivity to H2 was observed, which might be advantageous for selective detection of nitrogen oxides. The influence of humidity on the NO2 response was demonstrated to be significantly below 150 °C and systematically decreased upon increase in the operating temperature up to 400 °C.

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Section: Discussionmentioning

confidence: 99%

SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

Nowak

Maziarz

Rydosz

et al. 2020

Sensors

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“…Thus sticking coefficient varies inversely with molecular weight. For that reason, smaller molecules have higher possibilities to get adsorbed on metal oxide surface, with other parameters remaining same [36]. In this respect, the benzene molecules, having the smallest molecular weight (among all BTX), will have the maximum physisorption probability on the TiO 2 surface.…”

Section: Page 19 Of 23mentioning

confidence: 99%

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

Dutta

Chattopadhyay

et al. 2015

Applied Surface Science

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“…Considering the safety requirements in chemical and biomedical applications [ 1 , 2 , 3 ], an intensive research study was performed for the improvement of the static and dynamic behavior of ethanol vapor sensors prepared by surface acoustic wave [ 4 , 5 , 6 ], optical fiber [ 7 , 8 , 9 ] and chemiresistive metal oxide semiconductor (MOS) technology [ 10 , 11 , 12 , 13 , 14 , 15 ]. To prove this, one can follow the continuous development of novel nanocomposites between metal oxides and the carbon allotrope family (single and multi-walled carbon nanotubes (SWCNT and MWCNT)), graphene and single-walled carbon nanohorns (SWCNH) [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Organic–Inorganic Ternary Nanohybrids of Single-Walled Carbon Nanohorns for Room Temperature Chemiresistive Ethanol Detection

et al. 2020

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Organic–inorganic ternary nanohybrids consisting of oxidized-single walled carbon nanohorns-SnO2-polyvinylpyrrolidone (ox-SWCNH/SnO2/PVP) with stoichiometry 1/1/1 and 2/1/1 and ox-SWCNH/ZnO/PVP = 5/2/1 and 5/3/2 (all mass ratios) were synthesized and characterized as sensing films of chemiresistive test structures for ethanol vapor detection in dry air, in the range from 0 up to 50 mg/L. All the sensing films had an ox-SWCNH concentration in the range of 33.3–62.5 wt%. A comparison between the transfer functions and the response and recovery times of these sensing devices has shown that the structures with ox-SWCNH/SnO2/PVP = 1/1/1 have the highest relative sensitivities of 0.0022 (mg/L)−1, while the devices with ox-SWCNH/SnO2/PVP = 2/1/1 have the lowest response time (15 s) and recovery time (50 s) for a room temperature operation, proving the key role of carbonic material in shaping the static and dynamic performance of the sensor. These response and recovery times are lower than those of “heated” commercial sensors. The sensing mechanism is explained in terms of the overall response of a p-type semiconductor, where ox-SWCNH percolated between electrodes of the sensor, shunting the heterojunctions made between n-type SnO2 or ZnO and p-type ox-SWCNH. The hard–soft acid–base (HSAB) principle supports this mechanism. The low power consumption of these devices, below 2 mW, and the sensing performances at room temperature may open new avenues towards ethanol sensors for passive samplers of environment monitoring, alcohol test portable instruments and wireless network sensors for Internet of Things applications.

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Sensing properties of two-component Langmuir–Blodgett layer and its porous derivative in SAW sensor for vapors of methanol and ethanol

Cited by 21 publications

References 14 publications

SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

Organic–Inorganic Ternary Nanohybrids of Single-Walled Carbon Nanohorns for Room Temperature Chemiresistive Ethanol Detection

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