Cadmium telluride/polypyrrole nanocomposite based Love wave sensors highly sensitive to acetone at room temperature

Šetka, Milena; Bahos, F.A.; Chmela, Ondřej; Matatagui, Daniel; Gràcia, I.; Drbohlavová, Jana; Vallejos, Stella

doi:10.1016/j.snb.2020.128573

Cited by 25 publications

(14 citation statements)

References 60 publications

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“…In this line, a study of nanocomposites in which small amounts of Au [ 113 ] or Ag [ 107 ] were embedded into PPy showed improvement in the sensing properties of PPy to low ethylene and acetone concentrations, respectively. A similar approach also indicated potential advantages on acetone detection for PPy modified with CdTe quantum dots [ 108 ] and polytetrafluoroethylene (PTFE) modified with Ti [ 109 ]. The modification of PEDOT with a low amount of GO also proved a higher response for PEDOT to methanol at room temperature.…”

Section: Tailoring Materials For Enhanced Sensing Properties To Vomentioning

confidence: 99%

VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials

et al. 2021

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This review summarizes the recent research efforts and developments in nanomaterials for sensing volatile organic compounds (VOCs). The discussion focuses on key materials such as metal oxides (e.g., ZnO, SnO2, TiO2 WO3), conductive polymers (e.g., polypyrrole, polythiophene, poly(3,4-ethylenedioxythiophene)), and carbon-based materials (e.g., graphene, graphene oxide, carbon nanotubes), and their mutual combination due to their representativeness in VOCs sensing. Moreover, it delves into the main characteristics and tuning of these materials to achieve enhanced functionality (sensitivity, selectivity, speed of response, and stability). The usual synthesis methods and their advantages towards their integration with microsystems for practical applications are also remarked on. The literature survey shows the most successful systems include structured morphologies, particularly hierarchical structures at the nanometric scale, with intentionally introduced tunable “decorative impurities” or well-defined interfaces forming bilayer structures. These groups of modified or functionalized structures, in which metal oxides are still the main protagonists either as host or guest elements, have proved improvements in VOCs sensing. The work also identifies the need to explore new hybrid material combinations, as well as the convenience of incorporating other transducing principles further than resistive that allow the exploitation of mixed output concepts (e.g., electric, optic, mechanic).

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Section: Tailoring Materials For Enhanced Sensing Properties To Vomentioning

confidence: 99%

VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials

et al. 2021

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“…Evidence for currently available commercial ketone breathalyzers is lacking. Many studies have assessed the utility of novel sensors in the ketogenic diet [ 25 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ], but very few have evaluated currently available devices. The BIOSENSE™ device is a breathalyzer with published clinical trial data detailing its efficacy.…”

Section: Current Technologymentioning

confidence: 99%

“…Šetka et al developed a new sensor capable of working at room temperature using cadmium telluride/polypyrrole (CdTe/PPy) nanocomposites which were integrated into Love mode surface acoustic wave (L SAW) sensors [ 50 ]. This new sensor achieved high specificity and selectivity for VOCs, including acetone.…”

Section: Future Technologiesmentioning

confidence: 99%

“…The sensor was made up of two components, the first being PPy, which is a conductive polymer, and the second being CdTe. The PPy was meant to overcome weaknesses associated with plain conductive polymers such as high working temperature, poor selectivity, or low response speed [ 50 ]. By incorporating a metal in the form of CdTe, these limitations could be overcome.…”

Section: Future Technologiesmentioning

confidence: 99%

“…The sensor had response and recover times at acetone concentration of 50 ppm, of 23 and 637 s, respectively and at concentrations of 50–125 ppm, of 7 and 550 s, respectively. Compared to the aforementioned GQD 3DOM ZnO [ 53 ] and the CdTe/PPy [ 50 ] sensors, the response/recovery time is very high. The operating temperature of 450 °C is also very high and would require a greater energy input.…”

Section: Future Technologiesmentioning

confidence: 99%

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The Ketogenic Diet: Breath Acetone Sensing Technology

Alkedeh

Priefer

2021

Biosensors

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The ketogenic diet, while originally thought to treat epilepsy in children, is now used for weight loss due to increasing evidence indicating that fat is burned more rapidly when there is a low carbohydrate intake. This low carbohydrate intake can lead to elevated ketone levels in the blood and breath. Breath and blood ketones can be measured to gauge the level of ketosis and allow for adjustment of the diet to meet the user’s needs. Blood ketone levels have been historically used, but now breath acetone sensors are becoming more common due to less invasiveness and convenience. New technologies are being researched in the area of acetone sensors to capitalize on the rising popularity of the diet. Current breath acetone sensors come in the form of handheld breathalyzer devices. Technologies in development mostly consist of semiconductor metal oxides in different physio-chemical formations. These current devices and future technologies are investigated here with regard to utility and efficacy. Technologies currently in development do not have extensive testing of the selectivity of the sensors including the many compounds present in human breath. While some sensors have undergone human testing, the sample sizes are very small, and the testing was not extensive. Data regarding current devices is lacking and more research needs to be done to effectively evaluate current devices if they are to have a place as medical devices. Future technologies are very promising but are still in early development stages.

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Room‐Temperature High‐Performance Trace Level Acetone Sensor Based on Polypyrrole Nanotubes

et al. 2023

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Recently, precise detection of VOCs in particular acetone, ammonia alcohol has attracted huge attention for industrial safety, monitoring of environment and human health. In this article we have reported for a polypyrrole nanotube (PPNT)‐based chemiresistive sensor for the selective detection of trace acetone vapour at room temperature (25 °C). Polypyrrole (PPy) nanoparticles with different morphologies, viz. nanotubes, nanowire, and globular were synthesized using methyl orange (MO), cetyltrimethyl ammonium bromide (CTAB), and pure polypyrrole as the growth template. The as synthesized powders were exploited to fabricate Taguchi‐type thick‐film sensors. The synthesized powders and fabricated sensors were characterized by multiple sophisticated techniques, such as, XRD, FTIR, Raman spectroscopy, SEM, EDS, UV‐VIS spectroscopy, optical non‐contact profilometry, and current‐Voltage (I‐V) measurement. It is observed that the PPNT sensor shows the highest response to trace acetone vapour with a lower detection limit of 500 ppb at room temperature (25 °C) and quick response (∼5.4 sec) and recovery (∼73.94 sec) times. Achieved enhanced sensing behaviour can be attributed to formation of hydrogen bond between acetone and PPy. Combined with room temperature sensing, good stability, repeatability, produce sensor may find application in various sensing fields.

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Cadmium telluride/polypyrrole nanocomposite based Love wave sensors highly sensitive to acetone at room temperature

Cited by 25 publications

References 60 publications

VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials

VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials

The Ketogenic Diet: Breath Acetone Sensing Technology

Room‐Temperature High‐Performance Trace Level Acetone Sensor Based on Polypyrrole Nanotubes

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