α‐Fe₂O₃ Film with Highly Photoactivity for Non‐enzymatic Photoelectrochemical Detection of Glucose

Abstract

A non‐enzyme photoelectrochemical (PEC) glucose sensor based on α‐Fe2O3 film is investigated. The α‐Fe2O3 film was fabricated via a simple spin coating method. The proposed glucose sensor exhibits good selectivity, a fast response time of <5 s, a linear range of 0.05 to 6.0 mM, sensitivity of 17.23 μA mM−1 cm−2 and a detection limit of 0.05 μM. Meanwhile, the excellent performances of the α‐Fe2O3 sensor were obtained in reproducibility and the long‐term stability under ambient condition. The linear amperometric response of the sensor covers the glucose levels in physiological and clinical for diabetic patients. Therefore, this non‐enzyme PEC sensor based on α‐Fe2O3 film has a great potential application in the development of glucose sensors.

Laser-Induced Graphitization of Polydopamine on Titania Nanotubes

“…84,91,92 In this case, n-type semiconductors are used, and the photocurrent increase in the presence of analyte is also positive. 93,94 However, there are n-type based PEC sensing materials, where the photocurrent decreases upon the addition of analyte. 90,95 On the other hand, p-type semiconductors exhibit reverse trends and negative photocurrents.…”

Photoelectrochemical Sensing of Hydrogen Peroxide on Hematite

“…Besides, it is also promising because it enables 2D reaction confinement on the transducer surface (i. e. on the photoelectrode) which can be useful for electrode reuse or for the design of multiplexed arrays . So far, PEC sensing has been mainly employed for the detection of biological macromolecules, in immuno‐ or apta‐ assays and has also been explored for the detection of small organic molecules such as antioxidants or glucose . While H 2 O 2 is a widely‐employed hole scavenger in the field of energy‐related photoelectrochemical research (typically used to probe the upper performance of water‐splitting photoanodes), the PEC sensing of H 2 O 2 has been only reported on TiO 2 , WO 3 , ZnO, BiVO 4 , and Si‐based photoanodes and on Cu 2 O, CuO, CdS, and CuInS 2 ‐based photocathodes.…”

“…[18,19] So far, PEC sensing has been mainly employed for the detection of biological macromolecules, [20] in immuno- [21] or apta- [22] assays and has also been explored for the detection of small organic molecules such as antioxidants [23] or glucose. [24,25] While H 2 O 2 is a widely-employed hole scavenger in the field of energy-related photoelectrochemical research (typically used to probe the upper performance of watersplitting photoanodes), [26,27] the PEC sensing of H 2 O 2 has been only reported on TiO 2 , [28][29][30] WO 3 , [31] ZnO, [32,33] BiVO 4 , [34,35] and Si [36] -based photoanodes and on Cu 2 O, [37] CuO, [38] CdS, [39] and CuInS 2 [40] -based photocathodes. Hematite (α-Fe 2 O 3 ) is a promising photoanode material due to its great abundance, low-cost, chemical stability and its high theoretical photoconversion efficiency.…”

“…This is a severe drawback for energy‐related applications but can be a great advantage for the design of PEC sensor arrays activated by micrometer‐sized spots of light . Hematite photoanodes have been previously employed for the PEC sensing of biological macromolecules, neurotransmitters, endocrine disruptors, glucose, inorganic pollutants, and metal cations . In this paper, we report the preparation of hematite photoanodes by a convenient spin‐coating/annealing method and the use of these surfaces for H 2 O 2 PEC sensing.…”

“…This is a severe drawback for energy-related applications [41,42] but can be a great advantage for the design of PEC sensor arrays activated by micrometer-sized spots of light. [15,17] Hematite photoanodes have been previously employed for the PEC sensing of biological macromolecules, [43,44] neurotransmitters, [17] endocrine disruptors, [45,46] glucose, [25,44] inorganic pollutants, [47] and metal cations. [48] In this paper, we report the preparation of hematite photoanodes by a convenient spin-coating/annealing method and the use of these surfaces for H 2 O 2 PEC sensing.Our hematite precursor is poly(vinylferrocene) (pvf), a Fecontaining polymer, dissolved in tetrahydrofuran (THF), which was spin-coated onto FTO slides and subsequently annealed, as shown in Figure 1a.…”