Article
Materials Science, Multidisciplinary
Yuying Bai, Yin Zhang, Xiangfeng Chu, Lifang He, Shiming Liang
Summary: A series of Ti3C2Tx-ZnFe2O4 composites were prepared by ultrasonic dispersion method, and the obtained samples were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, etc. The acetone sensing properties of Ti3C2Tx-ZnFe2O4 composites were investigated, and the 10 wt% composite showed a higher response and improved selectivity towards acetone compared to pure ZnFe2O4 at room temperature.
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, 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, Physical
Jingxuan Wu, Song Zou, Bo Wang, Changhao Feng, Tatsuo Yoshinobu
Summary: In this study, acetone sensitive W-doped ZnFe2O4 composite nanofibers were successfully prepared through a simple single-spinneret electrospinning method and calcination treatment. The properties and performance of the nanofibers were thoroughly analyzed, demonstrating enhanced sensitivity and selectivity to acetone vapor. The sensors based on 6 mol% W-doped ZnFe2O4 composite nanofibers showed a high response to low concentrations of acetone vapor.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Cong Zheng, Cheng Zhang, Kui Zhang, Jian Zhang, Ling Jin, Abdullah M. Asiri, Khalid A. Alamry, Lifang He, Xiangfeng Chu
Summary: The study successfully constructed ZnFe2O4 nanosheets assembled on reduced graphene oxide, demonstrating excellent gas sensing properties with strong response to ethanol. The integration of graphene oxide was found to increase selectivity, and the composite showed good stability and satisfied response to ethanol ranging from 0.1 ppm to 100 ppm at 210 degrees C.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
M. H. M. Facure, R. Schneider, L. A. Mercante, D. S. Correa
Summary: This study investigates the synthesis conditions of luminescent graphene quantum dots (GQDs) using hydrothermal synthesis with graphene oxide as a precursor. By adjusting the concentration, temperature, and pH of the synthesis, the quantum yield (QY) of GQDs can be optimized for better control of their luminescent properties. The findings show that the synthesis parameters play a crucial role in tailoring the surface functionalities of GQDs, which can influence their luminescent properties. This research provides insights into the rational production of GQDs with tailored properties and sheds light on the mechanism of GQDs-based optical sensors.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Sania Rashid, Saima Perveen, Saiqa Hafeez, Samsaam Uddin Asad, Muhammad Zarrar Khan, Fahad Azad
Summary: The GQDs/Co0.5Zn0.5Fe2O4 nanocomposite was synthesized using a sonication-assisted approach, and its properties were characterized using various techniques. The synthesized samples confirmed the formation of GQDs and Co-Zn ferrite without impurity peaks. The inclusion of GQDs in the nanocomposite led to enhanced dielectric constant at low frequencies, and the nanocomposite also exhibited superparamagnetic properties, making it a potential contrast agent in MRI applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Analytical
Weiwei Guo, Lingli Huang, Bangyu Zhao, Xue Gao, Zihong Fan, Xingyan Liu, Youzhou He, Jie Zhang
Summary: The ZnFe2O4/ZnSnO3 nanocomposite was prepared and characterized, showing excellent gas-sensing performance towards acetone due to its specific surface area, oxygen vacancy, and n-n heterojunction. This nanocomposite exhibited fast response, long-term stability, and good humidity resistance, making it a promising candidate for gas sensor applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Lifang He, Jingjie Hu, Qiming Yuan, Zhangcheng Xia, Ling Jin, Hongliang Gao, Liyuan Fan, Xiangfeng Chu, Fanli Meng
Summary: Constructing porous and heterojunction structures within the semiconductor oxide composites is an ideal strategy for developing gas sensing materials, but it is difficult due to grain boundaries. In this study, ZnFe2O4/SnO2 (ZFO/SNO) composite with porous core-shell spheres structure was successfully synthesized by combining pre-synthesized SnO2 nanospheres with ZnFe2O4. The porous ZFO/SNO composite with a Zn to Sn ratio of 1:0.7 showed excellent acetone sensing performance, attributed to its rich heterojunctions, porous structure, and small nanoparticle size.
SENSORS AND ACTUATORS B-CHEMICAL
(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
Nanoscience & Nanotechnology
Yuanyuan Song, Fubo Gu, Zhihua Wang, Dongmei Han
Summary: In this study, ZIF-8-derived metal oxide semiconductor nanocomposite was prepared through in situ growth for use as an acetone gas sensor. The heterojunction sensor showed a high response value and fast response time to acetone, even under high humidity conditions. The excellent acetone sensitivity enhancement was attributed to the tightly bound n-n heterojunction structure and morphological characteristics of ZnFe2O4/ZnO.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Jingjie Hu, Qiming Yuan, Cheng Zhang, Jian Zhang, Lifang He, Hongliang Gao, Ling Jin, Liyuan Fan, Kui Zhang, Xiangfeng Chu, Fanli Meng
Summary: Developing hierarchically porous semiconductor oxides is an effective approach to enhance their sensing properties. In this study, a strategy involving the use of cotton as biotemplates was developed to synthesize porous ZnFe2O4 with flaky and curly sheet structures. The sensor based on the calcined porous ZnFe2O4 sheet composite exhibited good selectivity, fast response, and stability towards acetone.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Nanoscience & Nanotechnology
Elif Orhan, Aslihan Anter, Murat Ulusoy, Baris Polat, Can Okuyucu, Mustafa Yildiz, Semsettin Altindal
Summary: Carbon, especially graphene quantum dots (GQDs) based electronics, have gained attention as a promising technology. Modifying the electrical and optoelectronic properties of GQDs through physical/chemical processes or synthetic methods may open up new applications. In this study, gadolinium-doped polyethyleneimine (PEI) functionalized and nitrogen-doped graphene quantum dots (GdNPs-PEI@N-GQDs) were synthesized by a hydrothermal method to investigate how doping carbon-based materials with Gd affects their electrical properties. The electrical properties of the GdNPs/PEI@N-GQDs nanocomposite-based diode were analyzed using current-voltage (I-V) and capacitance and conductance voltage (C-V & G/ω-V) techniques. The study found that the diode exhibited rectification behavior with a rectification ratio (RR) of 14 at ±5V. However, after doping with Gd, the diode showed ohmic behavior with a rectification ratio of 2.8 x 10(4) at ±5V. These findings have implications for the advancement of carbon-based electronics technology.
ADVANCED ELECTRONIC MATERIALS
(2023)
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
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
Materials Science, Multidisciplinary
Anish Bhattacharya, Yufang Jiang, Qi Gao, Xiangfeng Chu, Yongping Dong, Shiming Liang, Amit K. Chakraborty
JOURNAL OF MATERIALS RESEARCH
(2019)
Article
Chemistry, Physical
Anish Bhattacharya, Xiangfeng Chu, Qi Gao, Xue Li, Yongping Dong, Shiming Liang, Amit K. Chakraborty
APPLIED SURFACE SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Xiangfeng Chu, Jiulin Wang, Qi Gao, Yan Wang, Shiming Liang, Linshan Bai, Yongping Dong, Mauro Epifani
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2020)
Article
Chemistry, Multidisciplinary
Anna Staerz, Simona Somacescu, Mauro Epifani, Tetsuya Kida, Udo Weimar, Nicolae Barsan
Article
Engineering, Electrical & Electronic
Anish Bhattacharya, Yin Zhang, Haiyan Wu, Xiangfeng Chu, Yongping Dong, Shiming Liang, Jiaqiang Xu, Amit K. Chakraborty
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Chemistry, Analytical
Mauro Epifani, Saulius Kaciulis, Alessio Mezzi, Ting Zhang, Jordi Arbiol, Pietro Siciliano, Anton Landstrom, Isabella Concina, Abderrahim Moumen, Elisabetta Comini, Chu Xiangfeng
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Materials Science, Multidisciplinary
Anish Bhattacharya, Xiangfeng Chu, Yongping Dong, Shiming Liang, Amit K. Chakraborty
Article
Chemistry, Physical
Alessandro Di Mauro, Marta Maria Natile, Anton Landstrom, Isabella Concina, Matteo Ferroni, Vittorio Privitera, Giuliana Impellizzeri, Mauro Epifani
Summary: MoO2 nanocrystals were successfully prepared through solvothermal treatment in oleic acid, exhibiting efficient adsorption and photodegradation capabilities for organic pollutants, particularly methylene blue. The findings suggest that metallic MoO2 is a promising candidate for environmental remediation applications.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Chemistry, Analytical
Xue Li, Yin Zhang, Anish Bhattacharya, Xiangfeng Chu, Shiming Liang, Dawen Zeng
Summary: This paper investigates the gas sensing properties of CdGa2O4 spinel oxide-based gas sensors for formaldehyde. By controlling the preparation conditions, materials with good responses to formaldehyde were obtained, showing promise for the detection of formaldehyde at ultralow concentrations.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Review
Chemistry, Analytical
Jessica Yazmin Monter-Guzman, Xiangfeng Chu, Elisabetta Comini, Mauro Epifani, Rodolfo Zanella
Summary: The connection between heterogeneous catalysis and chemoresistive sensors is becoming clearer, particularly with supported noble metals nanoparticles. While a clear connection has not been established yet for metal oxide catalysts, the catalytic properties of various oxides show promise for designing gas sensors with high selectivity.
Article
Chemistry, Analytical
Mauro Epifani
Summary: This article critically summarizes the key issues of tungsten trioxide (WO3) as an active material for chemoresistive sensors. The review covers sensing results, crystallographic phase transitions, surface properties, and sensing mechanisms, highlighting the significant research progress in these areas.
Article
Chemistry, Multidisciplinary
Sudipto Pal, Sanosh Kunjalukkal Padmanabhan, Amruth Kaitheri, Mauro Epifani, Antonio Licciulli
Summary: A solar light active photocatalyst was developed by coating silver phosphate (Ag3PO4) onto titania-silica (TiO2-SiO2) microspheres. The Ag3PO4 particles covered the surface of the TiO2-SiO2 microspheres, allowing the composites to absorb the entire visible light spectrum. The composite photocatalyst exhibited higher efficiency compared to its pristine counterparts and a benchmark commercial TiO2.
Article
Nanoscience & Nanotechnology
Luca Francioso, Chiara De Pascali, Pasquale Creti, Antonio Radogna, Simonetta Capone, Antonietta Taurino, Mauro Epifani, Chiara Baldacchini, Anna R. Bizzarri, Pietro A. Siciliano
ACS APPLIED NANO MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
