Integration of tungsten layers for the mass fabrication of WO3-based pH-sensitive potentiometric microsensors

Lale, Ahmet; Tsopela, Aliki; Civélas, Aurélie; Salvagnac, Ludovic; Launay, Jérôme; Temple‐Boyer, Pierre

doi:10.1016/j.snb.2014.09.054

Cited by 21 publications

(8 citation statements)

References 58 publications

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“…MO x with micro–nano structures have been widely used in the fabrication of pH sensors due to their unique pH-sensitive properties and advantages, such as high mechanical strength, low cost, thermal stability and weather resistance [ 48 , 52 , 57 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 ]. MO x –based pH sensors can achieve a fast response in different environments and have the advantages of long life and easy miniaturization, which makes such sensors suitable for applications in wearable healthcare systems.…”

Section: Ph-sensitive Materials and Wearable Sensorsmentioning

confidence: 99%

Recent Advances in Wearable Potentiometric pH Sensors

Tang

Liu

et al. 2022

Membranes

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Wearable sensors reflect the real–time physiological information and health status of individuals by continuously monitoring biochemical markers in biological fluids, including sweat, tears and saliva, and are a key technology to realize portable personalized medicine. Flexible electrochemical pH sensors can play a significant role in health since the pH level affects most biochemical reactions in the human body. pH indicators can be used for the diagnosis and treatment of diseases as well as the monitoring of biological processes. The performances and applications of wearable pH sensors depend significantly on the properties of the pH–sensitive materials used. At present, existing pH–sensitive materials are mainly based on polyaniline (PANI), hydrogen ionophores (HIs) and metal oxides (MOx). In this review, we will discuss the recent progress in wearable pH sensors based on these sensitive materials. Finally, a viewpoint for state–of–the–art wearable pH sensors and a discussion of their existing challenges are presented.

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Section: Ph-sensitive Materials and Wearable Sensorsmentioning

confidence: 99%

Recent Advances in Wearable Potentiometric pH Sensors

Tang

Liu

et al. 2022

Membranes

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“…This demand can be met by metal oxide semiconductors, which offer advantages such as low cost, excellent biocompatibility, and easy integration with wearable devices used in healthcare [11][12][13][14]. Several metal-oxide films are currently used as multifunctional sensing applications, such as Rh 2 O 3 [15] SnO 2 [16], WO 3 [17], IGZO [18,19], ITO [20], Ta 2 O 5 [21], MgO [22], Al 2 O 3 /SiO 2 [23], TiO 2 [24], CuO [13], ZnO [3,[25][26][27][28][29] and CoO [30,31]. Among these, ZnO has several unique features such as a wide band gap, low intrinsic carrier concentration, high maximum n-type doping, and high maximum p-type doping of 3.32 eV, < 10 6 cm −3 , 10 19 cm −3 , and 10 -17 cm −3 , respectively [32,33].…”

Section: Introductionmentioning

confidence: 99%

A dual-functional flexible sensor based on defects-free Co-doped ZnO nanorods decorated with CoO clusters towards pH and glucose monitoring of fruit juices and human fluids

Hilal

Yang

2022

Nano Convergence

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Herein, ZnO nanorods were doped with Co and decorated with CoO clusters through an in situ technique to create a CoO/Co-doped ZnO (CO/CZO) heterostructure at low temperatures (150 °C) on a flexible PET substrate. In the CO/CZO heterostructure, the Co dopant has a low energy barrier to substitute Zn atoms and adsorb over oxygen atoms and their vacancies. Therefore, it decreased the charge density (ND = 2.64 × 1019 cm−3) on non-active sites of ZnO and lowered the charge transfer resistance (317 Ω) at Co-doped-ZnO/electrolyte interface by suppressing the native defects and reducing the Schottky barrier height (− 0.35 eV), respectively. Furthermore, CoO clusters induced a p-n heterostructure with Co-doped ZnO, prevented corrosion, increased the active sites for analyte absorption, and increased the ultimate tensile strength (4.85 N m−2). These characteristics enabled the CO/CZO heterostructure to work as a highly sensitive, chemically stable, and flexible pH and glucose oxidation electrode. Therefore, CO/CZO heterostructure was explored for pH monitoring in human fluids and fruit juices, demonstrating a near-Nernst-limit pH sensitivity (52 mV/pH) and fast response time (19 s) in each human fluid and fruit juice. Also, it demonstrated high sensitivity (4656 µM mM−1 cm−2), low limit of detection (0.15 µM), a broad linear range (0.04 mM to 8.85 mM) and good anti-interference capacity towards glucose-sensing. Moreover, it demonstrated excellent flexibility performances, retained 53% and 69% sensitivity of the initial value for pH and glucose sensors, respectively, after 500 bending, stretching, and warping cycles. Graphical Abstract

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“…20,21 The electrode was miniaturized enough to match with the small space in biological microenvironments, such as a single cell or certain locations in tissues appears to have great advantages over other electrodes with an ordinary size. 22 Many applications have been developed based on microsensors, such as pH measurement, 23 and detection of nitric oxide, 24 glucose, 25 ascorbic acid, 26 dopamine, 27 etc. Carbon ber is one of the most promising candidate materials for microsensors due to its tiny size, sensitivity and selectivity.…”

Section: Introductionmentioning

confidence: 99%