Flexible sensors based on two conductive electrodes and MWCNTs coating for efficient pH value measurement

Stojanović, Goran M.; Kojić, Tijana; Radovanović, Milan; Vasiljević, Dragana; Panić, Sanja; Srdić, Vladimir V.; Cvejić, Jelena

doi:10.1016/j.jallcom.2019.04.243

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…For these reasons the development of solid-state pH sensors on various exible substrates using sensitive materials ranging from metal oxides (MO x ) and semiconductors to polymers and carbonbased materials is a growing area of research in electrochemical sensing technologies. 8 Electrochemical pH sensors of this kind can generally be categorized as potentiometric, 36,37 conductimetric/chemi-resistors [38][39][40][41] or ion sensitive eld effect transistors (ISFET) [42][43][44] etc. The potentiometric pH sensors are discussed here in detail (Section 3 given design) as they offer stable performance, high sensitivity, less interference, easiness in wireless system, low power, long lifetime and fast response as compared to other type of pH sensors.…”

Section: Introductionmentioning

confidence: 99%

Flexible potentiometric pH sensors for wearable systems

2020

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Section: Introductionmentioning

confidence: 99%

Flexible potentiometric pH sensors for wearable systems

2020

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“…The same performance (23%/pH unit) is achieved with impedance spectroscopy of COOH-functionalized MWCNT spin-coated on Kapton ® with gold electrodes [ 59 ]. Using Aluminum electrode leads to a significant decrease in performance (14%/pH unit).…”

Section: Cnt-based Sensors With Different Analytes In Watermentioning

confidence: 99%

“…It is advantageous because it features little constraints regarding substrates and because it allows the use of a large panel of solution-based CNT pre-treatment protocols, such as purification, acidification, functionalization, sorting by chirality or by diameter [ 52 ]. A large variety of techniques is available to deposit CNTs from a dispersion onto a substrate: drop-casting [ 53 ], spin coating [ 54 ], dip-coating [ 55 ], inkjet printing [ 56 ], spray-coating [ 57 ], aerosol jet printing [ 58 ] or vacumm filtering [ 59 ]. After substrate deposition of a CNT dispersion, particularly following drop casting, dielectrophoresis may then be used to improve on the deposition quality, notably to control accurately CNT positioning or to achieve CNT alignment [ 60 ].…”

Section: Operating Principles Of Cnt-based Chemical Sensorsmentioning

confidence: 99%

“… [ 125 ] MWCNT COOH Covalent pH pH 4~9 N.P. 17 Ω/pH 23%/pH (Au), 16 Ω/pH 14%/pH (Al) Impedance spectroscopy Dip coating Au and Al interdigitated electrodes Kapton ® [ 59 ] * The relative sensitivity is calculated using the formula

, with x the absolute sensitivity expressed (depending on the transduction) in units of resistance, voltage or current per pH unit and x 0 the baseline parameter (resistance, voltage or current) at pH 7. The relative sensitivity is not calculated for potentiometry-based transduction as it depends on the choice of reference voltages and the three references can be easily compared by their absolute sensitivity.…”

Section: Cnt-based Sensors With Different Analytes In Watermentioning

confidence: 99%

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Electrical and Electrochemical Sensors Based on Carbon Nanotubes for the Monitoring of Chemicals in Water—A Review

Cho

Azzouzi

Zucchi

et al. 2021

Sensors

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Carbon nanotubes (CNTs) combine high electrical conductivity with high surface area and chemical stability, which makes them very promising for chemical sensing. While water quality monitoring has particularly strong societal and environmental impacts, a lot of critical sensing needs remain unmet by commercial technologies. In the present review, we show across 20 water monitoring analytes and 90 references that carbon nanotube-based electrochemical sensors, chemistors and field-effect transistors (chemFET) can meet these needs. A set of 126 additional references provide context and supporting information. After introducing water quality monitoring challenges, the general operation and fabrication principles of CNT water quality sensors are summarized. They are sorted by target analytes (pH, micronutrients and metal ions, nitrogen, hardness, dissolved oxygen, disinfectants, sulfur and miscellaneous) and compared in terms of performances (limit of detection, sensitivity and detection range) and functionalization strategies. For each analyte, the references with best performances are discussed. Overall, the most frequently investigated analytes are H+ (pH) and lead (with 18% of references each), then cadmium (14%) and nitrite (11%). Micronutrients and toxic metals cover 40% of all references. Electrochemical sensors (73%) have been more investigated than chemistors (14%) or FETs (12%). Limits of detection in the ppt range have been reached, for instance Cu(II) detection with a liquid-gated chemFET using SWCNT functionalized with peptide-enhanced polyaniline or Pb(II) detection with stripping voltammetry using MWCNT functionalized with ionic liquid-dithizone based bucky-gel. The large majority of reports address functionalized CNTs (82%) instead of pristine or carboxyl-functionalized CNTs. For analytes where comparison is possible, FET-based and electrochemical transduction yield better performances than chemistors (Cu(II), Hg(II), Ca(II), H2O2); non-functionalized CNTs may yield better performances than functionalized ones (Zn(II), pH and chlorine).

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“…As shown in Figure 4, these devices can be integrated with various accessories for everyday use such as glasses, lenses, mouth guards, bandages, bracelets, bandanas and smart clothes such as bras, socks and gloves, yet can be integrated with tattoos, stickers, among others (Lisak et al, 2015; Ray, Choi, Reeder, et al, 2019; Scognamiglio & Arduini, 2019; Stojanovi & Srdi, 2019; Tasca et al, 2019; Zamora et al, 2018).…”

Section: Introductionmentioning

confidence: 99%