Review
Chemistry, Multidisciplinary
Xiaofeng Zhu, Yongzhen Li, Pei Cao, Peng Li, Xinzhu Xing, Yue Yu, Ruihua Guo, Hui Yang
Summary: Graphene quantum dots (GQDs) have attracted increasing interest in chemiresistive gas sensors due to their unique physical and chemical properties. While several review articles have covered the various sensing principles and applications of GQDs, there is currently no single review article focusing on their application in chemiresistive gas sensing. Therefore, this review presents the progress and challenges of GQD-based composites in chemiresistive gas sensors, including the synthesis strategies, gas sensing enhancement mechanisms, and resulting sensing characteristics. The discussion also highlights the future prospects for the rational design of advanced GQDs-based gas-sensing materials and innovative gas sensors with novel functionalities.
Article
Chemistry, Physical
Tao Shao, Qiankun Zhang, Jinling Li, Shijie He, Dongxia Zhang, Xibin Zhou
Summary: A novel high-efficiency electrocatalyst based on N-doped graphene quantum dots and silver-platinum hollow nanodendrites has been synthesized for methanol oxidation reaction. The electrocatalyst exhibits excellent catalytic activity and stability, providing a valuable way to prepare multi-component catalysts with hollow nanostructures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Yujeong Jeong, Seongbin Hong, Gyuweon Jung, Wonjun Shin, Jinwoo Park, Donghee Kim, Yong Seok Choi, Jong-Ho Bae, Byung Hee Hong, Jong-Ho Lee
Summary: The paper explores the humidity sensing characteristics of a silicon metal oxide semiconductor field effect transistor (Si MOSFET)-based humidity sensor using graphene quantum dots (GQDs) as the sensing material. The sensor demonstrates a response rate of 78% to humid air with a relative humidity of 81.3%, and the response and recovery characteristics can be improved significantly by applying a pulsed pre-bias method. The FET-type humidity sensor shows highly stable and reproducible characteristics in long-term measurements over a period of 5 months across all relative humidity ranges.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Parisa Gouran Oorimi, Aliakbar Tarlani, Reza Zadmard, Jacques Muzart
Summary: This report presents a simple and highly sensitive photoluminescence sensor for detecting fatal cyanide ions using a novel composite material made from graphene quantum dots (GQDs) encapsulated in zeolitic imidazolate framework (ZIF-11). The sensor demonstrated excellent detection capabilities with a wide linear range, low relative standard deviation, and a very low limit of detection. It also showed good sensitivity towards cyanide ions in the presence of other interfering ions. Real cyanide samples from apple seeds and bitter almonds were successfully detected using this sensor. The reliable and valuable performance of this sensor makes it a promising candidate for cyanide ion detection.
MICROCHEMICAL JOURNAL
(2023)
Article
Spectroscopy
Rongkun Zhu, Mushen Lai, Mingfang Zhu, Huanru Liang, Qing Zhou, Rui Li, Wenhao Zhang, Hongqing Ye
Summary: A functional ratio fluorescence sensor based on molecularly imprinted polymer coated double quantum dots has been developed for the sensitive, selective, and visual detection of sinapic acid. The sensor shows a linear response range, low detection limit, ability to distinguish molecules with similar structure, as well as fast response time and long-lasting fluorescence intensity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Engineering, Electrical & Electronic
Xuhao Wei, Austin Taranta, Bo Shi, Meng Ding, Zitong Feng, David J. Richardson, Francesco Poletti, Radan Slavik
Summary: Thermal phase sensitivity in optical fibers is undesirable for fiber interferometers and applications requiring a fixed phase. Using hollow core fiber reduces thermal phase sensitivity, and coiling the fiber further reduces this sensitivity significantly.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Letter
Optics
Bumjoon Jang, Julian Gargiulo, Jisoo Kim, Johannes Buerger, Steffen Both, Hartmut Lehmann, Torsten Wieduwilt, Thomas Weiss, Stefan A. Maier, Markus A. Schmidt
Summary: The research focuses on combining on-chip integrated waveguides with spectroscopic methods to reduce geometric footprints and increase device densities, and interfacing light cages with optical fibers to create a fully fiber-integrated on-chip waveguide arrangement, improving gas diffusion times. The successful device integration via 3D nanoprinting demonstrates the attractiveness of the fiber-interfaced light cage as a waveguide platform for various spectroscopy-related fields such as bio-analytics, lab-on-chip photonic sensing, chemistry, and quantum metrology.
Review
Chemistry, Inorganic & Nuclear
Pavithra V. Ravi, Vinodhini Subramaniyam, Neha Saravanakumar, Ajay Pattabiraman, Moorthi Pichumani
Summary: Graphene Quantum Dots (GQDs) are a breakthrough material with optoelectronic properties, widely used in various applications such as agriculture, biomedical, sensors, energy storage, water desalination, and environmental remediation. Functionalization of GQDs enhances their biocompatibility, making them suitable for use in biotechnology, immunology, biochemistry, and diagnostics. The nanoscale morphology of GQDs can alter device structure and simplify functionality, leading to potential applications in wearable and portable sensors. This review explores functionalization strategies of GQDs and their applications in different fields.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Cheng Yang, Yanyan Wang, Zhekun Wu, Zhanbo Zhang, Nantao Hu, Changsi Peng
Summary: This study presents three-dimensional MoS2/rGO/GQDs hybrids with improved gas sensing performance for NO2 sensors. The addition of GQDs prevents agglomeration of nanosheets and enhances sensitivity, repeatability, and selectivity of the sensor.
Article
Engineering, Electrical & Electronic
Charu Goel, Jichao Zang, Matyas Parrot, Seongwoo Yoo
Summary: This study presents a compact, temperature-insensitive, multi-axial mechanical force sensor based on a single-core antiresonant hollow-core fiber. By enhancing the interaction between interfering modes in the fiber, a four-fold increase in interference pattern amplitude was achieved, resulting in distinguishable linear responses to external mechanical forces. The sensor shows negligible thermal crosstalk and is inherently insensitive to light polarization, making it suitable for simultaneous sensing of transverse and longitudinal mechanical forces.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yalei Hu, Christof Neumann, Lena Scholtz, Andrey Turchanin, Ute Resch-Genger, Siegfried Eigler
Summary: Graphene quantum dots with long-wavelength emission were synthesized using a solvothermal method and their chemical structure and optical properties were investigated. The effects of solvent polarity and proticity on the optical properties were studied, and a luminescence mechanism was proposed. Additionally, the potential of graphene quantum dots for optical sensing of trace amounts of water was assessed.
Article
Engineering, Electrical & Electronic
Eric Numkam Fokoua, Wenwu Zhu, Meng Ding, Zitong Feng, Yong Chen, Thomas D. Bradley, Gregory T. Jasion, David J. Richardson, Francesco Poletti, Radan Slavik
Summary: Hollow-core optical fibers convey light in air, showing remarkably low sensitivity of the propagation delay to temperature changes, especially in photonic bandgap type. The residual variation in propagation delay observed near the zero sensitivity wavelength has no apparent correlation to imposed temperature changes. Practical thermal stability of latency is limited by polarization mode dispersion, with strong polarization mode coupling observed in addition to birefringence.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Youfu Lu, Nan Shi, Mingming Wang, Xinyang Wang, Liyang Yin, Qiang Xu, Pinhui Zhao
Summary: This study successfully prepared GQDs/SBS composite modifier and investigated its effects on asphalt modification. The results showed that GQDs could be evenly dispersed into the SBS phase, enhancing the polarity and improving the high-temperature performance of asphalt.
Article
Chemistry, Multidisciplinary
Dheeraj Kumar, Sweety Rani, Bhanu Nandan, Rajiv K. Srivastava
Summary: Graphene quantum dots (GQDs) are a promising carbon nanomaterial with exceptional physiochemical properties. A microwave-assisted pyrolytic process is developed to synthesize GQDs with controlled size and without polar functionalities using Styrofoam waste as the precursor. The GQDs are highly soluble in nonpolar solvents and can be used as a coating on cotton fabric to provide durable hydrophobicity and excellent self-cleaning property. The use of nonbiodegradable polymer waste to generate GQDs not only addresses the issues of waste disposal, but also enables the production of high value-added products.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Chenyu Yao, Mengyuan Hu, Andrea Ventura, Juliano Grigoleto Hayashi, Francesco Poletti, Wei Ren
Summary: This study demonstrates the use of a quantum cascade laser coupled with a custom-made tellurite hollow-core antiresonant fiber for mid-infrared absorption spectroscopy for gas detection. Through direct absorption spectroscopy and wavelength modulation spectroscopy, it achieves high detection accuracy and sensitivity, particularly for nitric oxide (NO) detection.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
