Synthesis of carbon dots for Al³⁺ sensing in water by fluorescence assay

Abstract

Fifty‐four Eucommia ulmoides leaves were subjected to a hydrothermal technique to synthesize carbon dots (CDs) of 3.55 ± 1.45 nm size. The nanomaterial possessed excellent stability and strong fluorescence emission (φf 42.3%). In a neutral buffer solution, the fluorescence signals of CDs solution were enhanced by aluminium ion without interference from other ions. Degree of enhancement correlated linearly with the Al3+ content in the range 0.01–2.5 mM. Response of this method was fast and sensitive (detection limit was 23 nM). The CDs performed successfully as a sensitive sensor for trace Al3+ determination in water samples, and satisfactory results were obtained.

Advances in the use of nanomaterials for nucleic acid detection in point-of-care testing devices: A review

“…Powerful smartphones have brought benefits to productivity, and the lives of people in all aspects, and provide a new idea for the development of POCT. The strong fluorescence of nanomaterials ( Li et al, 2018 ; Mei et al, 2021 ; Ye et al, 2021 ) means they can be accurately captured by smartphones, which might create a trend in POCT development in the future.…”

“…Powerful smartphones have brought benefits to productivity, and the lives of people in all aspects, and provide a new idea for the development of POCT. The strong fluorescence of nanomaterialsMei et al, 2021;Ye et al, 2021) means they can be accurately captured by smartphones, which might create a trend in POCT development in the future.However, in order to obtain accurate test results, an adequate fluorescence signal and sensitive detection are indispensable. It is also worth noting the smartphone is not professional camera equipment, and can experience data loss or sensitivity decrease, and should thus be treated with caution when used as a detector.…”

Fiber-Optic Detection of Aluminum and Copper in Real Water Samples Using Enzyme–Carbon Quantum Dot (CQD)-Based Thin-Film Biosensors

“…In an example, phosphorus-/nitrogen-doped fluorescent CQDs were used to detect the chromium heavy metal with a detection limit of 1.35 μM . In another study, CQDs were synthesized from Eucommia ulmoides for the detection of aluminum in water with a limit of detection of 23 nM . In another study, graphene oxide-based N,S-doped carbon dots were used for the detection of multiple heavy metal ions based on the quenching mechanism .…”

“…21 In another study, CQDs were synthesized from Eucommia ulmoides for the detection of aluminum in water with a limit of detection of 23 nM. 22 In another study, graphene oxidebased N,S-doped carbon dots were used for the detection of multiple heavy metal ions based on the quenching mechanism. 23 A fluorescent nanoprobe comprised of carbon dots and multicolor CdTe quantum dots was developed for the multiplexed detection of mercury, copper, and silver on a single platform.…”

Fluorescence ‘off–on’ probe for lead (II) detection based on Atractylodes III CQDs and bioimaging

“…[24] A sensitive and quantitative method for Pb(II) detection is needed in environmental science and the life sciences. Carbon quantum dots (CQDs) have been widely used in sensor analysis, [25] drug delivery, [26] photocatalysis [27] and optoelectronic devices [28] due to their splendid water solubility and low toxicity. There have been many studies on the use of CQDs for Pb(II) or other metal ion detection.…”