Graphene quantum dots as a novel sensing material for low-cost resistive and fast-response humidity sensors

2015 ◽  
Vol 218 ◽  
pp. 73-77 ◽  
Author(s):  
Virginia Ruiz ◽  
Iván Fernández ◽  
Pedro Carrasco ◽  
Germán Cabañero ◽  
Hans J. Grande ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Fast Response ◽  
Humidity Sensors ◽  
Sensing Material

Biopolymer Derived Thin Carbon Film As a Novel Sensing Material for Low-Cost Resistive and Fast-Response Humidity Sensors

2021 ◽  
Vol MA2021-01 (55) ◽  
pp. 1381-1381
Author(s):  
Beomsang Kim ◽  
Shalik Ram Joshi ◽  
Shin-Kwan Kim ◽  
Gun-Ho Kim ◽  
Heungjoo Shin
Keyword(s):  
Low Cost ◽  
Carbon Film ◽  
Fast Response ◽  
Humidity Sensors ◽  
Sensing Material ◽  
Thin Carbon ◽  
Thin Carbon Film

Biopolymer Derived Thin Carbon Film As a Novel Sensing Material for Low-Cost Resistive and Fast-Response Humidity Sensors

2020 ◽  
Vol MA2020-01 (27) ◽  
pp. 1946-1946
Author(s):  
Beomsang Kim ◽  
Shalik Ram Joshi ◽  
Shinkwan Kim ◽  
Gun-Ho Kim ◽  
Heungjoo Shin
Keyword(s):  
Low Cost ◽  
Carbon Film ◽  
Fast Response ◽  
Humidity Sensors ◽  
Sensing Material ◽  
Thin Carbon ◽  
Thin Carbon Film

scholarly journals Fast response ZnO/PVA nanocomposite-based photodiodes modified by graphene quantum dots

2019 ◽  
Vol 162 ◽  
pp. 249-255 ◽  
Author(s):  
Seyedeh Soraya Mousavi ◽  
Batool Sajad ◽  
Mohammad Hossein Majlesara
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Fast Response

scholarly journals High yield synthesis of graphene quantum dots from biomass waste as a highly selective probe for Fe3+ sensing

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aumber Abbas ◽  
Tanveer A. Tabish ◽  
Steve J. Bull ◽  
Tuti Mariana Lim ◽  
Anh N. Phan
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Cost Effective ◽  
Renewable Resource ◽  
Microwave Treatment ◽  
High Yield ◽  
Biomass Waste ◽  
Practical Applications

AbstractGraphene quantum dots (GQDs), a novel type of zero-dimensional fluorescent materials, have gained considerable attention owing to their unique optical properties, size and quantum confinement. However, their high cost and low yield remain open challenges for practical applications. In this work, a low cost, green and renewable biomass resource is utilised for the high yield synthesis of GQDs via microwave treatment. The synthesis approach involves oxidative cutting of short range ordered carbon derived from pyrolysis of biomass waste. The GQDs are successfully synthesised with a high yield of over 84%, the highest value reported to date for biomass derived GQDs. As prepared GQDs are highly hydrophilic and exhibit unique excitation independent photoluminescence emission, attributed to their single-emission fluorescence centre. As prepared GQDs are further modified by simple hydrothermal treatment and exhibit pronounced optical properties with a high quantum yield of 0.23. These modified GQDs are used for the highly selective and sensitive sensing of ferric ions (Fe3+). A sensitive sensor is prepared for the selective detection of Fe3+ ions with a detection limit of as low as 2.5 × 10–6 M. The utilisation of renewable resource along with facile microwave treatment paves the way to sustainable, high yield and cost-effective synthesis of GQDs for practical applications.

scholarly journals Synthesis and Characterization of Polymeric Graphene Quantum Dots Based Nanocomposites for Humidity Sensing

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Lam Minh Long ◽  
Nguyen Nang Dinh ◽  
Tran Quang Trung
Keyword(s):  
Quantum Dots ◽  
Atmospheric Pressure ◽  
Graphene Quantum Dots ◽  
Composite Films ◽  
Fast Response ◽  
Bulk Heterojunctions ◽  
Humidity Sensing ◽  
Best Value ◽  
Doped Graphene

Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylenedioxythiophene:poly(4-styrenesulfonate) (PEDOT:PSS) and carbon nanotube (CNT) to form a composite that can be used for humidity sensors. The 600 nm thick composite films contained bulk heterojunctions of CNT/GQD and CNT/PEDOT:PSS. The sensors made from the composites responded well to humidity in a range from 60 to 80% at room temperature and atmospheric pressure. With a CNT content of 0.4 wt.% (GPC-1) to 0.8 wt.% (GPC-2) and 1.2 wt.% (GPC-3), the sensitivity of the humidity sensing devices based on CNT-doped graphene quantum dot-PEDOT:PSS composites was increased from 4.5% (GPC-1) to 9.0% (GPC-1) and 11.0% (GPC-2), respectively. The fast response time of the GPC sensors was about 20 s and it was much improved due to CNTs doping in the composites. The best value of the recovery time was found to be of 40 s, for the GPC composite film doped with 1.2 wt.% CNT content.

scholarly journals Graphene Quantum Dots Open Up New Prospects for Interfacial Modifying in Graphene/Silicon Schottky Barrier Solar Cell

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Chao Geng ◽  
Xiuhua Chen ◽  
Shaoyuan Li ◽  
Zhao Ding ◽  
Wenhui Ma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Particle Size ◽  
Schottky Barrier ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Separation Processes ◽  
Band Bending ◽  
Carrier Recombination ◽  
Photovoltaic Applications ◽  
Graphene Oxide Quantum Dots

Graphene/silicon (Gr/Si) Schottky barrier solar cells (SBSCs) are attractive for harvesting solar energy and have been gaining grounds for its low-cost solution-processing. The interfacial barrier between graphene and silicon facilitates the reducing excessive carrier recombination while accelerating the separation processes of photo-generated carriers at the interface, which empowers the performance of Gr/Si SBSCs. However, the difficulty to control the interface thickness prevents its application. Here, we introduce the graphene oxide quantum dots (GOQDs) as a unique interfacial modulation species with tunable thickness by controlling the GOQDs particle size. The power conversion efficiency (PCE) of 13.67% for Gr/Si-based SBSC with outstanding stability in the air is obtained with the optimal barrier thickness (26 nm) and particle size (4.15 nm) of GOQDs. The GOQDs in Gr/Si-based SBSCs provide the extra band bending which further enhances the PCE for its photovoltaic applications.

A room temperature volatile organic compound sensor with enhanced performance, fast response and recovery based on N-doped graphene quantum dots and poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) nanocomposite

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57559-57567 ◽  
Author(s):  
Jaber Nasrollah Gavgani ◽  
Hamed Sharifi Dehsari ◽  
Amirhossein Hasani ◽  
Mojtaba Mahyari ◽  
Elham Khodabakhshi Shalamzari ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Room Temperature ◽  
Graphene Quantum Dots ◽  
Fast Response ◽  
Volatile Organic ◽  
Doped Graphene ◽  
Response And Recovery ◽  
Voc Sensor

A highly efficient VOC sensor based on N-doped graphene quantum dots (N-GQDs)/poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT–PSS) was fabricated at room temperature.

scholarly journals High Sensitivity of Ammonia Sensor through 2D Black Phosphorus/Polyaniline Nanocomposite

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3026
Author(s):  
Zuquan Wu ◽  
Lei Liang ◽  
Shibu Zhu ◽  
Yifan Guo ◽  
Yao Yao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
Oxidative Polymerization ◽  
High Sensitivity ◽  
Fast Response ◽  
Experimental Result ◽  
Conjugation System ◽  
Detection Range ◽  
Sensing Material ◽  
Response And Recovery

Recently, as a two-dimensional (2D) material, black phosphorous (BP) has attracted more and more attention. However, few efforts have been made to investigate the BP/polyaniline (PANI) nanocomposite for ammonia (NH3) gas sensors. In this work, the BP/PANI nanocomposite as a novel sensing material for NH3 detection, has been synthesized via in situ chemical oxidative polymerization, which is then fabricated onto the interdigitated transducer (IDTs). The electrical properties of the BP/PANI thin film are studied in a large detection range from 1 to 4000 ppm, such as conduction mechanism, response, reproducibility, and selectivity. The experimental result indicates that the BP/PANI sensor shows higher sensitivity and larger detection range than that of PANI. The BP added into PANI, that may enlarge the specific surface area, obtain the special trough structure for gas channels, and form the p–π conjugation system and p–p isotype heterojunctions, which are beneficial to increase the response of BP/PANI to NH3 sensing. Meanwhile, in order to support the discussion result, the structure and morphology of the BP/PANI are respectively measured by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV−vis), transmission electron microscopy (TEM), and field emissions scanning electron microscopy (SEM). Moreover, the sensor shows good reproducibility, and fast response and recovery behavior, on NH3 sensing. In addition, this route may offer the advantages of an NH3 sensor, which are of simple structure, low cost, easy to assemble, and operate at room temperature.

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