scholarly journals Cane Molasses Graphene Quantum Dots Passivated by PEG Functionalization for Detection of Metal Ions

ACS Omega ◽  
2020 ◽  
Vol 5 (12) ◽  
pp. 6763-6772 ◽  
Author(s):  
Ying Lou ◽  
Jianying Ji ◽  
Aimiao Qin ◽  
Lei Liao ◽  
Ziyuan Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Graphene Quantum Dots ◽  
Cane Molasses ◽  
Peg Functionalization

Nanomolar Level Detection of Metal Ions by Improving the Monodispersity and Stability of Nitrogen-Doped Graphene Quantum Dots

2021 ◽  
Author(s):  
Neeraj Sohal ◽  
Simran Kaur Bhatia ◽  
Soumen Basu ◽  
Banibrata Maity
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Fluorescent Sensor ◽  
Graphene Quantum Dots ◽  
Intrinsic Properties ◽  
Heteroatom Doping ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Heteroatom doping of graphene quantum dots (GQDs) leads to modify their intrinsic properties and used as a fluorescent sensor for the metal ions sensing. Here, Nitrogen-doped GQDs (N-GQDs) was synthesized...

scholarly journals Investigating the Properties of Cetyltrimethylammonium Bromide/Hydroxylated Graphene Quantum Dots Thin Film for Potential Optical Detection of Heavy Metal Ions

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2591 ◽  
Author(s):  
Nur Ain Asyiqin Anas ◽  
Yap Wing Fen ◽  
Nor Azah Yusof ◽  
Nur Alia Sheh Omar ◽  
Nur Syahira Md Ramdzan ◽  
...  
Keyword(s):  
Thin Film ◽  
Heavy Metal ◽  
Quantum Dots ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Cetyltrimethylammonium Bromide ◽  
Graphene Quantum Dots ◽  
Atomic Force ◽  
The Fourier Transform ◽  
High Absorption

The modification of graphene quantum dots (GQDs) may drastically enhance their properties, therefore resulting in various related applications. This paper reported the preparation of novel cetyltrimethylammonium bromide/hydroxylated graphene quantum dots (CTAB/HGQDs) thin film using the spin coating technique. The properties of the thin film were then investigated and studied. The functional groups existing in CTAB/HGQDs thin film were confirmed by the Fourier transform infrared (FTIR) spectroscopy, while the atomic force microscope (AFM) displayed a homogenous surface of the thin film with an increase in surface roughness upon modification. Optical characterizations using UV-Vis absorption spectroscopy revealed a high absorption with an optical band gap of 4.162 eV. Additionally, the photoluminescence (PL) spectra illustrated the maximum emission peak of CTAB/HGQDs thin film at a wavelength of 444 nm. The sensing properties of the as-prepared CTAB/HGQDs thin film were studied using a surface plasmon resonance technique towards the detection of several heavy metal ions (HMIs) (Zn2+, Ni2+, and Fe3+). This technique generated significant results and showed that CTAB/HGQDs thin film has great potential for HMIs detection.

Photoluminescence Properties Research on Graphene Quantum Dots/Silver Composites

2016 ◽  
Vol 16 (4) ◽  
pp. 3480-3488
Author(s):  
Jun Wang ◽  
Yan Li ◽  
Bo-Ping Zhang ◽  
Dan-Dan Xie ◽  
Juan Ge ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Chemical Method ◽  
Graphene Quantum Dots ◽  
Physical Method ◽  
Peak Position ◽  
Great Promise ◽  
Excitation Wavelength ◽  
Silver Composites ◽  
Physical And Chemical

Graphene quantum dots (GQDs) possess unique properties of graphene and exhibit a series of new phenomena of 0 dimension (D) carbon materials. Thus, GQDs have attracted much attention from researchers and have shown great promise for many applications. Recently, many works focus on GQDs-metal ions and metal nanoparticles (NPs). Although, many researches point out that metal ions and metal NPs have significant effect on photoluminescence (PL) feature of GQDs, mainly focus on PL intensity. Here, for the first time, we reported that metal NPs also affected PL peak position which was dependent on the mix mechanism of metal and GQDs. When GQDs-silver (Ag) composite mixed by physical method and excited at a wavelength of 320 nm, PL peak position of composites first showed blue-shifted then red-shifted with increasing of Ag content. However, if GQDs-Ag composite prepared by chemical method, PL peak position of the composites blue-shifted. Furthermore, the shift of PL peak position of GQDs-Ag prepared both for physical and chemical method displayed excitation-dependent feature. When the excitation wavelength approached to Ag SPR peaks, no obvious PL shift was observed. The mechanism for different PL shifts and the phenomenon of excitation-dependent PL shift as well as the formation mechanism of GQDs-Ag composite by chemical method are discussed in detail in this paper.

Hydroxylated graphene quantum dots as fluorescent probes for sensitive detection of metal ions

2020 ◽  
Vol 27 (1) ◽  
pp. 91-99 ◽  
Author(s):  
Qiang Ge ◽  
Wen-hui Kong ◽  
Xin-qian Liu ◽  
Ying-min Wang ◽  
Li-feng Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Fluorescent Probes ◽  
Graphene Quantum Dots ◽  
Sensitive Detection

Graphene quantum dots and carbon nano dots for the FRET based detection of heavy metal ions

2019 ◽  
Vol 19 ◽  
pp. 100347 ◽  
Author(s):  
Mrinmoy Kumar Chini ◽  
Vishal Kumar ◽  
Ariba Javed ◽  
Soumitra Satapathi
Keyword(s):  
Heavy Metal ◽  
Quantum Dots ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Graphene Quantum Dots
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