scholarly journals Using N-doped Carbon Dots Prepared Rapidly by Microwave Digestion as Nanoprobes and Nanocatalysts for Fluorescence Determination of Ultratrace Isocarbophos with Label-Free Aptamers

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 223 ◽  
Author(s):  
Xin Li ◽  
Xin Jiang ◽  
Qingye Liu ◽  
Aihui Liang ◽  
Zhiliang Jiang
Keyword(s):  
Catalytic Activity ◽  
Detection Limit ◽  
Fluorescent Probe ◽  
Carbon Dots ◽  
Rapid Determination ◽  
Microwave Digestion ◽  
Label Free ◽  
Laser Scattering ◽  
Doped Carbon Dots

The strongly fluorescent and highly catalytic N-doped carbon dots (CDN) were rapidly prepared by a microwave irradiation procedure and were characterized by electron microscopy (EM), laser scattering, infrared spectroscopy (IR), and by their fluorescence spectrum. It was found that the CDN had a strong catalytic effect on the fluorescence reaction of 3,3′,5,5′-tetramethylbenzidine hydroxide ((TMB)–H2O2) which produced the oxidation product of TMB (TMBOX) with strong fluorescence at 406 nm. The aptamer (Apt) was adsorbed on the CDN surfaces which weakened the fluorescence intensity due to the inhibition of catalytic activity. When the target molecule isocarbophos (IPS) was added, it reacted with the Apt to form a stable conjugate and free CDN which restored the catalytic activity to enhance the fluorescence. Using TMBOX as a fluorescent probe, a highly sensitive nanocatalytic method for determination of 0.025–1.5 μg/L IPS was established with a detection limit of 0.015 μg/L. Coupling the CDN fluorescent probe with the Apt–IPS reaction, a new CD fluorescence method was established for the simple and rapid determination of 0.25–1.5 μg/L IPS with a detection limit of 0.11 μg/L.

Selective determination of Ag+ using Salecan derived nitrogen doped carbon dots as a fluorescent probe

2017 ◽  
Vol 77 ◽  
pp. 508-512 ◽  
Author(s):  
Junjian Li ◽  
Gancheng Zuo ◽  
Xiaoliang Qi ◽  
Wei Wei ◽  
Xiaohao Pan ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Selective Determination ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Label-free fluorescence assay based on near-infrared B,N-doped carbon dots as a fluorescent probe for the detection of sialic acid

2020 ◽  
Vol 44 (6) ◽  
pp. 2350-2356 ◽  
Author(s):  
Nan Wang ◽  
Mengke Wang ◽  
Yang Yu ◽  
Guojian Yang ◽  
Xingguang Su
Keyword(s):  
Sialic Acid ◽  
Fluorescent Probe ◽  
Carbon Dots ◽  
Near Infrared ◽  
Fluorescence Assay ◽  
Label Free ◽  
Activity Detection ◽  
Doped Carbon Dots ◽  
Co Doped

A simple and sensitive sensing strategy for sialic acid activity detection on the basis of novel near-infrared B,N co-doped carbon dots was constructed.

Facile one-step synthesis of highly luminescent N-doped carbon dots as an efficient fluorescent probe for chromium(vi) detection based on the inner filter effect

2018 ◽  
Vol 42 (5) ◽  
pp. 3729-3735 ◽  
Author(s):  
Haitao Wang ◽  
Shan Liu ◽  
Yisha Xie ◽  
Jingran Bi ◽  
Yao Li ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Inner Filter Effect ◽  
Fluorescence Assay ◽  
Assay System ◽  
Label Free ◽  
Chromium Vi ◽  
Filter Effect ◽  
One Step ◽  
Doped Carbon Dots

Label-free fluorescence assay system is designed for Cr(iv) detection.

N-doped carbon dots as a fluorescent probe for the sensitive and facile detection of carbamazepine based on the inner filter effect

2018 ◽  
Vol 42 (11) ◽  
pp. 8992-8997 ◽  
Author(s):  
Yujie Ma ◽  
Yueyue Song ◽  
Yunsu Ma ◽  
Fangdi Wei ◽  
Guanhong Xu ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Inner Filter Effect ◽  
Filter Effect ◽  
Doped Carbon Dots

N-doped carbon dots are used as a fluorescent probe for the sensitive and facile determination of carbamazepine based on the inner filter effect.

scholarly journals Preparation of Highly Catalytic N-Doped Carbon Dots and Their Application in SERS Sulfate Sensing

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1655 ◽  
Author(s):  
Libing Wang ◽  
Chongning Li ◽  
Yanghe Luo ◽  
Zhiliang Jiang
Keyword(s):  
Catalytic Activity ◽  
Detection Limit ◽  
Gold Nanoparticle ◽  
Carbon Dots ◽  
Fluorescence Methods ◽  
Doped Carbon Dots ◽  
Sers Intensity ◽  
Excellent Stability

Carbon dots (CD) have excellent stability and fluorescence activity, and have been widely used in fluorescence methods. However, there are no reports about using CD as catalysts to amplify SERS signals to detect trace sulfate. Thus, preparing CD catalysts and their application in SERS sulfate-sensing are significant. In this article, highly catalytic N-doped carbon dots (CDN) were prepared by a hydrothermal procedure. CDN exhibited strong catalysis of the gold nanoparticle (AuNP) reaction between HAuCl4 and H2O2. Vitoria blue 4R (VB4R) has a strong SERS peak at 1614 cm−1 in the formed AuNP sol substrate. When Ba2+ ions were added, they were adsorbed on a CDN surface to inhibit the CDN catalytic activity that caused the SERS peak decreasing. Upon addition of analyte SO42−, a reaction with Ba2+ produced stable BaSO4 precipitate and CDN, and its catalysis recovered to cause SERS intensity increasing linearly. Thus, an SERS method was developed for the detection of 0.02–1.7 μmol/L SO42−, with a detection limit of 0.007 μmol/L.

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