Nanomaterials
·
2024
·Vol. 14
·期 22
·1835
·
IF 4.4
Chong Li,Ran Tao,Jinqiao Hou,Huanming Wang,Chen Fu,Jingting Luo
Ammonia (NH 3 ) gas is prevalent in industrial production as a health hazardous gas. Consequently, it is essential to develop a straightforward, reliable, and stable NH 3 sensor capable of operating at room temperature. This paper presents an innovative approach to modifying SnO 2 colloidal quantum dots (CQDs) on the surface of Ti 3 C 2 T x MXene to form a heterojunction, which introduces a significant number of adsorption sites and enhances the response of the sensor. Zero-dimensional (0D) SnO 2 quantum dots and two-dimensional (2D) Ti 3 C 2 T x MXene were prepared by solvothermal and in situ etching methods, respectively. The impact of the mass ratio between two materials on the performance was assessed. The sensor based on 12 wt% Ti 3 C 2 T x MXene/SnO 2 composites demonstrates excellent performance in terms of sensitivity and response/recovery speed. Upon exposure to 50 ppm NH 3 , the frequency shift in the sensor is −1140 Hz, which is 5.6 times larger than that of pure Ti 3 C 2 T x MXene and 2.8 times higher than that of SnO 2 CQDs. The response/recovery time of the sensor for 10 ppm NH 3 was 36/54 s, respectively. The sensor exhibited a theoretical detection limit of 73 ppb and good repeatability. Furthermore, a stable sensing performance can be maintained after 30 days. The enhanced sensor performance can be attributed to the abundant active sites provided by the accumulation/depletion layer in the Ti 3 C 2 T x /SnO 2 heterojunction, which facilitates the adsorption of oxygen molecules. This work promotes the gas sensing application of MXenes and provides a way to improve gas sensing performance.
研究领域:
材料科学
·
传感器
·
纳米技术
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 43
·20422-20428
·
IF 2.562
Shendong Zhuang,Xiaoyong Xu,Yaru Pang,Jingguo Hu,Chi Yang,Ling Tong,Yuxue Zhou
The ultrafine SnO2 quantum dots (QDs) modified with poly(ethylene glycol methyl ether) (PEGME) (PEGME–SnO2 QDs) were synthesized via hydrothermal method. X-ray diffraction and high-resolution transmission electron microscopy were employed to illustrate that the PEGME–SnO2 QDs are uniform, monodispersed and about 4 nm in diameter. Then infrared spectrum and thermogravimetric analysis were used to prove that PEGME groups are bound tightly to SnO2 surfaces. The as-synthesized PEGME–SnO2 QDs excellently achieved photocatalytic degradation to Rhodamine B dye (RhB). The photon efficiency of the PEGME–SnO2 QDs catalyst and corresponding RhB dye degradation rate constant could reach 0.0058% and 9.98 × 10−2 min−1, respectively. This outstanding photocatalytic performance could be attributed to not only large surface-to-volume ratio and high crystallinity of the ultrafine and monodispersed QDs, but also good hydrophilicity and conductivity of the PEGME surface modifier. Remarkably, such PEGME–SnO2 QDs with outstanding photocatalytic efficiency and stable recyclability are promising to be applied to environmental purification.
研究领域:
材料科学
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环境科学
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纳米技术
·
光催化
·
表面化学
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-14
·
IF 9.043
Luo Linqu,Song Jianjun,Song Longfei,Zhang Hongchao,Bi Yicheng,Liu Lei,Yin Longwei,Wang Fengyun,Wang Guoxiu
3D hierarchical conductive Sn quantum dots encapsulated in N,S co-doped carbon nanofibers sheathed within rGO scrolls (Sn/NS-CNFs@rGO) were prepared through an electrospinning process.
Flexible Sn/NS-CNFs@rGO electrode exhibits superior long-term cycling stability and high-rate capability in sodium-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zepeng Wei,Manna Liu,Hongguo Li,Shishuai Sun,Liying Yang
SnO 2 quantum dots (QDs) intercalated with reduced graphene oxide nanosheet (rGO) composites are constructed by a simple hydrothermal process. The synergistic effect between the various assembly elements of the nanocomposite can compensate for the shortcomings of the individual components. The nanocomposite is attached to nickel foam to produce electrodes without adding carbon black and a binder, and the electrochemical properties of the composite electrodes are measured in 1 M Na 2 SO 4 electrolyte. The results show that the prepared composite electrodes have a capacity of 253.3 F/g at a current density of 100 mA/g, and the capacity remains at 198.9 F/g even at 2000 mA/g, indicating an excellent rate capability. Moreover, cyclic voltammetry results indicate that the composite electrodes present a specific capacitance retention of 95.9% after 6000 cycles, which supports potential application in supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Shengnan He,Hui Wu,Shuang Li,Ke Liu,Yaxiong Yang,Hongge Pan,Xuebin Yu
SnO 2 has been extensively investigated as an anode material for sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) due to its high Na/K storage capacity, high abundance, and low toxicity. However, the sluggish reaction kinetics, low electronic conductivity, and large volume changes during charge and discharge hinder the practical applications of SnO 2 -based electrodes for SIBs and PIBs. Engineering rational structures with fast charge/ion transfer and robust stability is important to overcoming these challenges. Herein, S-doped SnO 2 (S–SnO 2 ) quantum dots (QDs) (≈3 nm) encapsulated in an N, S codoped carbon fiber networks (S–SnO 2 –CFN) are rationally fabricated using a sequential freeze-drying, calcination, and S-doping strategy. Experimental analysis and density functional theory calculations reveal that the integration of S–SnO 2 QDs with N, S codoped carbon fiber network remarkably decreases the adsorption energies of Na/K atoms in the interlayer of SnO 2 –CFN, and the S doping can increase the conductivity of SnO 2 , thereby enhancing the ion transfer kinetics. The synergistic interaction between S–SnO 2 QDs and N, S codoped carbon fiber network results in a composite with fast Na + /K + storage and extraordinary long-term cyclability. Specifically, the S–SnO 2 –CFN delivers high rate capacities of 141.0 mAh g −1 at 20 A g −1 in SIBs and 102.8 mAh g −1 at 10 A g −1 in PIBs. Impressively, it delivers ultra-stable sodium storage up to 10,000 cycles at 5 A g −1 and potassium storage up to 5000 cycles at 2 A g −1 . This study provides insights into constructing metal oxide-based carbon fiber network structures for high-performance electrochemical energy storage and conversion devices.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Zou Xueyan,Yang Fengbo,Sun Xin,Qin Mingming,Zhao Yanbao,Zhang Zhijun
Thiol-functionalized silica nanospheres (SiO 2 -SH NSs) with an average diameter of 460 nm were synthesized through a hydrothermal route. Subsequently, the prepared SiO 2 -SH NSs were modified by SnO 2 quantum dots to afford SnO 2 /SiO 2 composite NSs possessing obvious fluorescence, which could be used to trace the target protein. The SnO 2 /SiO 2 NSs were further modified by reduced glutathione (GSH) to obtain SnO 2 /SiO 2 -GSH NSs, which can specifically separate glutathione S -transferase-tagged (GST-tagged) protein. Moreover, the peroxidase activity of glutathione peroxidase 3 (GPX3) separated from SnO 2 /SiO 2 -GSH NSs in vitro was evaluated. Results show that the prepared SnO 2 /SiO 2 -GSH NSs exhibit negligible nonspecific adsorption, high concentration of protein binding (7.4 mg/g), and good reused properties. In the meantime, the GST-tagged GPX3 separated by these NSs can retain its redox state and peroxidase activity. Therefore, the prepared SnO 2 /SiO 2 -GSH NSs might find promising application in the rapid separation and purification of GST-tagged proteins.
研究领域:
生物化学
·
纳米材料科学
·
蛋白质工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yi Xia,Lei Xu,Sufang He,Liexing Zhou,Mingjun Wang,Jing Wang,Sridhar Komarneni
2D Transition metal dichalcogenide (TMDs) has been recognized as a potential candidate for constructing wearable and safe room temperature gas sensor. Especially, the heterostructures of TMDs/ metal oxide semiconductors (MOS) have been proved to be potential candidates as NO 2 sensors at room temperature. However, the response/recovery rate and reversibility of the sensors is still not satisfactory due to the inefficient charge transfer on TMDs/MOS hetero-interface. In this study, SnO 2 quantum dots (QDs) were simply decorated on the surface of few or single layer WS 2 nanosheets to form 2D/0D heterostructures via a facile room temperature aqueous solution process and self-assembly method. The 2D/0D WS 2 /SnO 2 heterostructure-based optoelectronic gas sensor showed fast response/recovery rates and full reversibility to NO 2 at room temperature with enhanced response. The remarkable improvement in NO 2 sensing was because of the efficient interfacial charge separation rendered by 2D/0D heterostructures under ultraviolet illumination. Therefore, this study points out a potential strategy for the design of light-enhanced gas sensing materials.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
半导体物理
·
环境监测
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）