Microplasma nanoengineering of emission-tuneable colloidal nitrogen-doped graphene quantum dots as smart environmental-responsive nanosensors and nanothermometers

Kurniawan, Darwin; Weng, Ren-Jie; Setiawan, Owen; Ostrikov, Kostya Ken; Chiang, Wei‐Hung

doi:10.1016/j.carbon.2021.09.050

Cited by 28 publications

(11 citation statements)

References 97 publications

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“…The underlying mechanism is thought to consist of two main steps. These include the decomposition of long-chain structures into smaller units, the subsequent refusion into a nanograph domain, and the growth of GQDs [ 61 , 62 ]. Overall, the possibilities of the bottom-up method to utilize biomass derivatives as GQDs precursors have gained much interest nowadays, in order to realize a more sustainable, green, and eco-friendly approach to synthesize GQDs with unique properties and controlled structures to be usable for many applications.…”

Section: Graphene Quantum Dotmentioning

confidence: 99%

Recent Advances in Inflammatory Diagnosis with Graphene Quantum Dots Enhanced SERS Detection

et al. 2022

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Inflammatory diseases are some of the most common diseases in different parts of the world. So far, most attention has been paid to the role of environmental factors in the inflammatory process. The diagnosis of inflammatory changes is an important goal for the timely diagnosis and treatment of various metastatic, autoimmune, and infectious diseases. Graphene quantum dots (GQDs) can be used for the diagnosis of inflammation due to their excellent properties, such as high biocompatibility, low toxicity, high stability, and specific surface area. Additionally, surface-enhanced Raman spectroscopy (SERS) allows the very sensitive structural detection of analytes at low concentrations by amplifying electromagnetic fields generated by the excitation of localized surface plasmons. In recent years, the use of graphene quantum dots amplified by SERS has increased for the diagnosis of inflammation. The known advantages of graphene quantum dots SERS include non-destructive analysis methods, sensitivity and specificity, and the generation of narrow spectral bands characteristic of the molecular components present, which have led to their increased application. In this article, we review recent advances in the diagnosis of inflammation using graphene quantum dots and their improved detection of SERS. In this review study, the graphene quantum dots synthesis method, bioactivation method, inflammatory biomarkers, plasma synthesis of GQDs and SERS GQD are investigated. Finally, the detection mechanisms of SERS and the detection of inflammation are presented.

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Section: Graphene Quantum Dotmentioning

confidence: 99%

Recent Advances in Inflammatory Diagnosis with Graphene Quantum Dots Enhanced SERS Detection

et al. 2022

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“…Recently, an insulating or semiconducting interlayer was inserted between GR and Si as an approach to improve the performance of the GR/Si-junction-based optoelectronic devices. − It is expected that such an interlayer is also effective to enhance the performance of the GR/SiQDs:SiO 2 heterojunction. Among various kinds of interlayers, graphene quantum dots (GQDs) can act as a candidate for such an interlayer because GQDs are greatly attractive in optoelectronic device applications, thanks to their high mobility and tunable band gap. , Here, we report (trifluoromethanesulfonyl)-amide (TFSA)-doped GR (TFSA-GR)/GQDs/p-type SiQDs:SiO 2 (p-SiQDs:SiO 2 )/n-Si heterojunction PDs showing a broadband photoresponse even at zero bias, in other words, “self-powered”. The introduction of GQDs as an interlayer greatly reduces the DC of the PDs due to the carrier blocking effect, especially resulting in remarkable enhancement of D * and LDR.…”

Section: Introductionmentioning

confidence: 99%

“…Among various kinds of interlayers, graphene quantum dots (GQDs) can act as a candidate for such an interlayer because GQDs are greatly attractive in optoelectronic device applications, thanks to their high mobility and tunable band gap. 38,39 Here, we report (trifluoromethanesulfonyl)-amide (TFSA)-doped GR (TFSA-GR)/GQDs/p-type SiQDs:SiO 2 (p-SiQDs:SiO 2 )/n-Si heterojunction PDs showing a broadband photoresponse even at zero bias, in other words, "self-powered". The introduction of GQDs as an interlayer greatly reduces the DC of the PDs due to the carrier blocking effect, especially resulting in remarkable enhancement of D* and LDR.…”

Section: ■ Introductionmentioning

confidence: 99%

Remarkable Noise Reduction in High-Stability Self-Powered Doped Graphene/Si-Quantum Dot Broadband Photodetectors by Using Graphene Quantum Dots as an Interlayer

Jang

Shin

Choi

2022

ACS Sustainable Chem. Eng.

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Si quantum dots (SiQDs)-embedded SiO 2 (SiQDs:SiO 2 ) is highly attractive for photonic device applications due to advantages such as larger light absorption and faster photo-sensing than bulk Si. Here, we report (trifluoromethanesulfonyl)-amide (TFSA)-doped graphene (GR) (TFSA-GR)/p-type SiQDs:SiO 2 (p-SiQDs:SiO 2 ) heterojunction photodetectors (PDs) by using graphene quantum dots (GQDs) as an interlayer. The TFSA-GR/p-SiQDs:SiO 2 /n-Si PD exhibits a broadband photoresponse even at zero bias, meaning "self-powered", with a 0.36−0.67 A W −1 responsivity and an ∼90% external quantum efficiency in the 400− 1000 nm wavelength range. By inserting GQDs as an interlayer between the TFSA-GR and p-SiQDs:SiO 2 , the PD shows a remarkable reduction in dark current (DC) due to the carrier blocking effect, resulting in an ∼100 times' increase of the photocurrent (PC)/DC ratio and detectivity (∼10 6 and 4.50−8.35 × 10 12 cm Hz 1/2 W −1 ), respectively. The PC rise/decay times are also reduced to ∼1.08/0.94 μs from 1.22/1.46 μs at 600 nm, respectively, by the interlayer. The PC/DC is almost consistent even after 1000 h under ambient conditions (25 °C temperature/30−35% relative humidity), indicating excellent stability.

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“…The utilization of a fluorescence-based method using GQD derivatives for pH detection can overcome the challenges faced by the conventional electrochemical and colorimetric dye methods, , including performance degradation over time, instability, high interferences, dye toxicity, and reusability. ,,, Thus, fluorescence-based sensors using GQD derivatives emerge as a facile, fast, simple, and non-invasive real-time monitoring tool to diagnose human physiological conditions from the sweat pH with high sensitivity, selectivity, high spatiotemporal resolution, and reusability. As a result, fluorescence-based techniques have been widely applied not only for qualitative detections but also quantitative measurements for the detection of pH values, biomolecules, metal ions, and organic pollutants. ,,, Nevertheless, the application of GQD derivatives in the aqueous phase is very limited and prone to particle agglomeration, which causes suppression of the sensing performance due to instability of emission properties. , Park et al fabricated block copolymer-grafted GQDs for pH sensing, yet it is still solution-based and the PL response is non-linear, which further limits GQDs as a solution-based pH probe. Repetitive usage is also another practical issue needs to be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, fluorescence-based techniques have been widely applied not only for qualitative detections but also quantitative measurements for the detection of pH values, biomolecules, metal ions, and organic pollutants. 7,9,18,19 Nevertheless, the application of GQD derivatives in the aqueous phase is very limited and prone to particle agglomeration, which causes suppression of the sensing performance due to instability of emission properties. 9,20 Park et al fabricated block copolymer-grafted GQDs for pH sensing, 21 yet it is still solution-based and the PL response is non-linear, which further limits GQDs as a solution-based pH probe.…”

Section: ■ Introductionmentioning

confidence: 99%

Synergistic Effect in a Graphene Quantum Dot-Enabled Luminescent Skinlike Copolymer for Long-Term pH Detection

Laysandra

Kurniawan

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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The alluring properties of a luminescent graphene quantum dot (GQD)-based nanocomposite are unquestionable to realize many advanced applications, such as sweat pH sensors. The well-suited hydrophilic polymers to host GQDs can face an unavoidable swelling behavior, which deteriorates the mechanical stability, whereas the hydrophobic polymers can prevent swelling but at the same time barricade the analyte pathways to GQDs. To resolve the two aforementioned obstacles, we develop a nanocomposite film containing nitrogen-doped GQDs (NGQDs) incorporated into a transparent, elastic, and self-healable polymer matrix, composed of a hydrophobic n-butyl acrylate segment and a hydrophilic N-(hydroxymethyl)acrylamide segment for wearable healthcare pH sensors on the human body. Besides serving as the fluorescence source, NGQDs are also designed as a nano-cross-linker to promote abundant chemical and physical interactions within the nanocomposite network. This synergetic effect gives rise to a 10-fold higher mechanical strength, 7-fold increment in Young’s modulus, 4-fold increment in toughness, and 15-fold more sensitivity in pH detection (pH 3–10) compared to those of the pristine copolymer and NGQDs, respectively. Moreover, the mechanically enhanced nanocomposite possesses a high self-healing efficiency (94%) at room temperature even under water and demonstrates a stable sensing performance after repetitive usage for 30 days. Our work provides insights into the simple preparation of human skinlike nanocomposite elastomers usable for wearable pH sensors.

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Microplasma nanoengineering of emission-tuneable colloidal nitrogen-doped graphene quantum dots as smart environmental-responsive nanosensors and nanothermometers

Cited by 28 publications

References 97 publications

Recent Advances in Inflammatory Diagnosis with Graphene Quantum Dots Enhanced SERS Detection

Recent Advances in Inflammatory Diagnosis with Graphene Quantum Dots Enhanced SERS Detection

Remarkable Noise Reduction in High-Stability Self-Powered Doped Graphene/Si-Quantum Dot Broadband Photodetectors by Using Graphene Quantum Dots as an Interlayer

Synergistic Effect in a Graphene Quantum Dot-Enabled Luminescent Skinlike Copolymer for Long-Term pH Detection

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