A photoelectrochemical immunosensor for tris(2,3-dibromopropyl) isocyanurate detection with a multiple hybrid CdTe/Au–TiO2 nanotube arrays

Abstract

In this paper, tris(2,3-dibromopropyl) isocyanurate (TBC) is for the first time as far as we know determined by ultrasensitive photoelectrochemical (PEC) immunoassay using an antibody-modified ternary hybrid CdTe/Au-TiO2 nanotube arrays (NTAs) photoelectrode, developed by the pulse electrodeposition technique. The as-prepared hybrid shows enhanced photon absorption and photocurrent response, which subsequently increased the photoelectrical conversion efficiency in the visible region. TBC-antibody (Ab) was developed in rabbits as a result of immunization with the BSA-TBC conjugate and covalently cross-linked onto the CdTe/Au-TiO2 NTAs. Since the photocurrent is highly dependent on the TiO2 surface properties, the specific interaction between TBC and the antibody results in a sensitive change in the photocurrent, which displayed a linear range of 5.0 × 10(-11) to 5.0 × 10(-5) M and a low detection limit of 5.0 × 10(-11) M for TBC determination. This proposed strategy highlights the application of TiO2 nanotube in visible-light-activated photoelectrochemical biosensing, which could largely reduce the destructive effect of UV light on biomolecules.

Application of ZnxCd1−xSe-sensitized TiO2 nanotube arrays as photoanodes for solar cells

“…The agglomerated nanocrystallites result in decreased photocurrent and hence are less effective as a sensitizer. Similar results have been reported by Gao et al 50 and Feng et al 51 in the case of CdTe-modied TiO 2 nanotube arrays. Therefore, further studies were limited to 3, 5 and 7 cycles of deposition.…”

“…The photoelectrochemical responses obtained in our study are higher than the values reported previously for various sensitized-TiO 2 photoelectrodes. 4,5,7,15,51,60,56,63 Also, the results obtained in this study are in agreement with results reported by Yang et al 44 The electronic properties of sensitized and unsensitized TiO 2 NTA lms were determined using the Mott-Schottky (MS) method. The measurements were performed at a frequency of 100 Hz, with the potential scan range from 0.5 to À1 V (vs. SCE) under illumination.…”

Sensitization of TiO2nanotube array photoelectrodes with MnxCdySe

“…These aggregated Mn x Cd y Se nanocrystals in turn act as recombination centers for photoinduced electron-hole pairs, rendering them less effective as sensitizers. [41][42][43] Moreover, increased loading leads to the blockage of nanotubes pores resulting into a poor electrolyte penetration. Thus, a variation in the number of deposition cycles was found to have a profound effect on the current density.…”

Effective Improving the Detection Limit of Tris(2,3-dibromopropyl) Isocyanurate by Bis-amino inO-phenylenediamine

“…Several methods to detect TBC in environment were established including gas chromatography (GC) and liquid chromatography coupled with mass spectrometry (LC-MS) [2]. Zhao [3] and Feng [4] et al developed electrochemiluminescence (ECL) and photoelectrochemical immunosensor (PCI) techniques on the basis of a series of inorganic nanoparticles with good sensiticity and low detect limit. However, these protocols are either much complicated, or need relatively expensive equipments.…”