First report on onsite temperature based recovery of quenched chemiluminescence signal from graphenized μPADs: validation by catechins radical scavenging

Abstract

Graphene-based materials are found to be the excellent acceptors of chemiluminescence resonance energy transfer (CRET) phenomenon. Due to the presence of π-conjugated planar structure, these materials reported to quench the chemiluminescence (CL) signal. Based on this fact, herein, for the first time the recovery of quenched CL signal from different graphene-based materials is successfully obtained through the catalytic activity of onsite temperature. The maximum recovery of quenched signal at optimum temperature of 70 ℃ was found to be 1440 % from the 10 mg/ml reduced graphene oxide paper analytical devices (rGO-PADs), leaving the recovery of Flash graphene (FG) and Laser Induced graphene materials (LIG) as 895 %, 521 % respectively for the same conditions via generation of π-conjugated carbon radicals. Catechin, an antioxidant, was analyzed from 0.1 nM to 500 nM to interpret the generation of carbon radicals from graphenized materials. The proposed smartphone enabled onsite heating recovery model was validated with the lower limit of 94 pM (27.3 pg/ml) of catechin concentration without any advanced photodiodes or instrumentation. The validation was performed in real samples of green tea (GT1 and GT2). This method of CL recovery can be a future model of indicating the purity of graphene-based materials without use of advanced instrumentations.

Emerging trends in microfluidic-assisted nanomaterial synthesis for their high-resolution gas sensing applications

“…To attain heightened sensitivities at levels below parts per billion (ppb), metal ions or other substances, such as polymers, were typically utilised to decorate MOS and form hybrid composites [47]. In addition, numerous documented instances indicate that the sensitivity and efficacy of MOS can be adjusted through the regulation of various parameters, including but not limited to design, structure, morphology, surface area, and operating temperature [48,49]. Thus, significant improvements in the detection of VOCs have been observed in MOS structures with enormous surface area and little volume, according to the parameters examined.…”

Laser-induced in situ synthesis of nano-composite Co–Co3O4–rGO on paper: miniaturized biosensor for alkaline phosphatase detection

“…The carbon family possesses outstanding electrical, mechanical, optical, and thermal properties, suitable for various applications including biosensing [2], drug delivery [3], energy storage [4] and environmental monitoring sensors [5]. However, among carbonaceous materials, graphene, graphene oxide (GO), and reduced graphene oxide (rGO) materials have led to attract newer technologies with remarkable improvements in their attributes [6,7]. Moreover, physical and chemical and mechanical performance of several nanomaterials can be enhanced by many folds via the synergetic development of graphene materials and nanomaterials [8][9][10][11][12].…”