The intensification of luminol electrochemiluminescence by metallic oxide nanoparticles

Abstract

In this work, the intensification of luminol electrochemiluminescence (ECL) by metallic oxide nanoparticles (MONPs), as ZnO, MnO 2 , In 2 O 3 and TiO 2 , under alkaline condition is reported and the related mechanism is studied. It is found that all four types of those MONPs exhibit the effect toward the ECL intensification of luminol. Furthermore, the silica sol-gel film is taken to immobilize the MONPs onto the platinum electrodes. The so-obtained modified electrodes also show the enhanced ECL and better signal/noise ratio, as well improved signal stability. Finally, the ECL reagent, luminol, is immobilized together with the MONPs onto the electrode surface to perform as the ECL sensor. On resulting sensors, good linear responses are obtained toward hydrogen peroxide. The mechanism of intensification of luminol ECL by MONPs is discussed in this paper. It is proposed that the ECL intensification can be attributed to the production of reactive oxygen species, as well as the adsorption of luminol on surface of MONPs. electrochemiluminescence, intensification, luminal, metallic oxide nanoparticles, reactive oxygen species

A novel electrochemiluminescence choline biosensor based on biofunctional AMs-ChO biocomposite

“…Owing to possessing the property of mimic peroxidase activity, the Fe 3 O 4 nanospheres can catalyze the electrooxidation of H 2 O 2 , which will lead to the amplification of the ECL signal intensity of luminol-H 2 O 2 system. Meanwhile, TiO 2 has been reported to accelerate electron transfer by Song et al [40], and enhance the ECL signal of luminol reported by Tu's group [23][24][25]. Table 1, the resulted LOD in this work is lower than that using other analytical methods [8,10,42,2].…”

“…Similarly, titanium dioxide nanoparticles (TiO 2 ) have also become an attractive nanomaterial for immobilizing biomolecules on electrode surface owing to its inherent great biocompatibility, photocatalytic capability, high specific surface area, electrotransfer conductivity and chemical inertness [22]. Besides, Tu's group has demonstrated that TiO 2 can enhance the ECL of luminol and the enhancement is directly related to ROS [23][24][25]. GR, a two-dimensional construction material of sp 2 conjugated carbon atoms [26], is emerging as a rising star in the field of material science due to its extraordinary intrinsic properties [27,28] and structural features [29,30].…”

The electrochemiluminescence of luminol on titania nanotubes functionalised indium tin oxide glass for flow injection analysis

“…Here the comparison on performance of TiNTs with TNHSs is listed in Table 1b, the response toward H 2 O 2 on TiNTs functionalized ITO is greater. Even compared with those titania-based nano-composites, the present work had equally analytical merit (see Table 1c), although there was some datum obtained from the static mode (14,43), which was in native superiority than dynamic mode.…”

Improved electrogenerated chemiluminescence of luminol by cobalt nanoparticles decorated multi-walled carbon nanotubes

“…The subsequent chemical reaction between the oxidized luminol and H 2 O 2 (or O 2 ) produces ECL signal. Since the first report on the observation of ECL response for luminol at the electrode surface in alkaline solution [10], numerous attempts have been done to find effective approaches for the enhancement of ECL signal intensity of luminol in neutral medium [11][12][13][14]. It has been shown that the ECL reaction of luminol with oxygen or hydrogen peroxide is more efficient in alkaline medium through modification of the electrode surface with nano-materials [12,15].…”

“…Since the first report on the observation of ECL response for luminol at the electrode surface in alkaline solution [10], numerous attempts have been done to find effective approaches for the enhancement of ECL signal intensity of luminol in neutral medium [11][12][13][14]. It has been shown that the ECL reaction of luminol with oxygen or hydrogen peroxide is more efficient in alkaline medium through modification of the electrode surface with nano-materials [12,15].With the development of nanotechnology, various types of nano-structured materials with outstanding properties are being synthesized and applied for the construction of novel sensors and biosensors. Nano-structured materials provide higher effective surface area and higher catalytic activity in comparison with their respective bulk materials.…”