Enhanced photoelectrochemical biosensing performance for Au nanoparticle–polyaniline–TiO₂ heterojunction composites

Abstract

A novel photoelectrode for glucose PEC biosensing composed of TiONTAs, PANI, and AuNPs was successfully obtained. The GOx@Au–PANI–TiONTA electrode exhibited a wide response range (2–36 mM) with a low detection limit (0.02 mM) and good stability.

A Photoelectrochemical Platform Based on Polyaniline-Modified Titanium Dioxide Facet Heterostructure

“…For example, Ju and co-workers applied polyaniline (PANI)/titanium dioxide (TiO 2 ) nanotube composite to lactic acid photoelectric detection and obtained higher photocatalytic activity. Similarly, the previous research of our group has also shown that the addition of PANI effectively inhibits the recombination of photogenerated charges …”

“…Similarly, the previous research of our group has also shown that the addition of PANI effectively inhibits the recombination of photogenerated charges. 33 Herein, a photoelectrochemical platform was built based on polyaniline modified titanium dioxide facet heterojunction (FH-TiO 2 ) structures, and polyaniline was introduced into the FH structure as an electronic medium. Synthesis procedure and detection principle of the PANI@FH-TiO 2 electrode are presented in Scheme 1a.…”

Engineering exposed vertical nano-TiO2 (001) facets/BiOI nanosheet heterojunction film for constructing a satisfactory PEC glucose oxidase biosensor

“…The electrode generated a photovoltage as photogenerated electron–hole pairs accumulated on the cathode and anode under illumination. 22 When the light was canceled, the photogenerated holes collected on the anode and the photogenerated electrons collected on the cathode quickly recombined, and then the open circuit potential was recorded. The lifetime of the photogenerated carriers could be calculated with formula (2) .…”

Biomimetic gold nanomaterials for biosensing, bioimaging and biotherapy: a mini-review

“…After loading the enzyme, the Au-PANI-TiONTA electrode showed a good response to glucose in the linear range of 2–36 mM, and the detection limit was 0.02 mM. 124…”

“…After loading the enzyme, the Au-PANI-TiONTA electrode showed a good response to glucose in the linear range of 2-36 mM, and the detection limit was 0.02 mM. 124 As mentioned above, AuNMs can be easily functionalized by various biomolecules and other organic chemicals, and this property is also studied by Li et al In their study, using DNA-functionalized AuNPs (DNA-AuNPs) to initiate the hybrid chain reaction (HCR), a novel label-free electrochemiluminescence (ECL) biosensor was established to detect thymine DNA glycosylase (TDG). Combined with the amplification function of DNA-AuNPs triggered HCR and the inherent high sensitivity of ECL technology, the detection limit for TGD was 1.1 × 10 −5 U μL −1 (0.0028 ng mL −1 ).…”