查找使用阿拉丁产品的科研文献

Voltage-Modulated MoS2/Au Two-Terminal Optoelectronic Synapses for Wavelength-Selective Neuromorphic Computing

Rui Dai,Jiapeng Zheng,Hui Yang,Xi Chen

Two-terminal optoelectronic synapses have garnered great attention in neuromorphic computing due to their advantages in structural simplicity and energy efficiency. However, the device's operational flexibility is fundamentally limited by its spectral and electrical characteristics, which fail to tune photoresponses with wavelength selectivity and voltage modulation. Here, a MoS 2 /Au nanoparticle two-terminal optoelectronic synapse is presented that simultaneously achieves wavelength selectivity and voltage-modulated memory control. Adjusting the morphology of Au nanoparticles enables selective maximum photoresponses across the green and red wavelength regions, and voltage modulation induces switching between short-term and long-term memory states, thereby enhancing functional versatility. Based on this tunable photoresponse of the synapse, wavelength-selective image denoising and recognition tasks are demonstrated, achieving a maximum classification accuracy of 98.03% at 520 nm across the visible wavelength range. A wavelength-selective and voltage-modulated task for road condition classification is also implemented, incorporating an artificial neural network to track color-coded vehicles and classify their movement trajectories with precise directional recognition (96.67% accuracy). This work demonstrates a highly tunable optoelectronic synapse that achieves concurrent wavelength selectivity and voltage modulation in a single device, enabling neuromorphic computing and providing a practical strategy for developing highly efficient, multifunctional neuromorphic architectures.

Phase-Engineered 1T/2H-MoS2 Heterostructures for High-Conversion-Efficiency Lithium-Ion Photobatteries

Xuwu Xiao,Cheng Cheng,Cuizhi Chen,Lituo Zheng,Dong Wei,Mingdeng Wei,Zhensheng Hong

Photobatteries promise a revolutionary approach to both harvesting and storing solar energy; however, their development has been limited by rapid carrier recombination and the absence of interfaces to direct charge flow effectively. Here, we construct an in-plane 1T/2H-MoS2 heterostructure chemically connected onto carbon nanotubes (CNTs) that integrate metallic 1T-MoS2, semiconducting 2H-MoS2, and conductive CNTs into a multi-interface framework. This architecture generates a built-in electric field across the 1T/2H-MoS2 junction and provides continuous directional pathways for rapid electron extraction and transfer. Ultrafast transient absorption spectroscopy identifies long-lived charge-separated states with a prolonged carrier lifetime (τ2 ≈ 731 ps) in the 1T/2H-MoS2 heterostructure, more than double that of 2H-MoS2@CNTs. Meanwhile, Kelvin probe force microscopy reveals a pronounced light-induced potential gradient (∼75 mV), providing direct nanoscale evidence of efficient carrier extraction. These synergistic effects promote efficient charge separation and transport, enabling superior photoassisted lithium-ion storage. The 1T/2H-MoS2@CNTs-based lithium-ion photobattery demonstrates an increased storage capacity from 493.7 to 624.9 mAh g–1 at 0.5 A g–1 under illumination and a maximum photoconversion and storage efficiency of 6.62%, achieving an external voltage-free self-charging process. This study underscores rational multi-interface engineering to effectively integrate light harvesting and electrochemical storage for self-charging energy systems.

Phase Transformation-Tailored In-Plane Sulfur Vacancies in MoS2 for Enhanced Hydrodeoxygenation Performance

Linjie Guan,Qicheng Zhang,Mingjun Cen,Bin Chen,Wenchao Peng,Yang Li,Danyun Xu,Xiaobin Fan

MoS2-based catalysts can effectively achieve the hydrodeoxygenation of lipids or fatty acids into biojet fuel, alleviating the energy crisis and environmental problems. Nevertheless, the active sites of MoS2 are predominantly concentrated at the edges or rims, while the more extensive inert plane is deficient in effective catalytic sites. In this study, based on a phase transformation strategy, sulfur atoms in the inert plane are activated through annealing 1T MoS2, generating 2H MoS2 with abundant in-plane sulfur vacancies. Specifically, MoS2(U)-400 achieves 100% conversion of palmitic acid and over 99% hexadecane yield at 2 MPa H2 and 260 °C. This phase transformation-induced active site construction strategy provides a simple and effective catalyst for the hydrodeoxygenation of lipids and fatty acids.

From sensors to system-level integration: Flexible WO3/MoS2 heterojunction NO2 gas sensor

Mingyang Gao,Jun Guo,Xiaodong Yang,Yanjiang Zhou,José Artigas dos Santos Laranjeira,Julio R. Sambrano,Wen Zhang

While flexible gas sensors have attracted increasing attention, studies that advance their development toward system-level applications remain very limited. Here, we report a flexible WO 3 /MoS 2 nitrogen dioxide (NO 2 ) sensor. Benefiting from the synergistic effect of WO 3 and MoS 2 , the sensor exhibits a remarkable 364.5 % response to 1 ppm target gas, along with excellent selectivity, stability, and humidity tolerance. Moreover, the device maintains stable sensing performance under repeated bending, confirming its mechanical robustness for wearable applications. To demonstrate practical utility, the sensor was built into an ambient system that provides continuous OLED readout and triggers audible buzzer alarms once the NO 2 concentration exceeds user-defined thresholds. This work not only highlights the excellent sensing performance of the WO 3 /MoS 2 heterojunction device but also demonstrates its strong potential for system-level deployment in real-world air quality monitoring and personal exposure warning scenarios.

Boosting industrial bio-denitrification through gene activation: the micro-nano-MoS2 enhanced bioprocess

Peng Zhaozhou,Sun Jiangyuan,Li Panpan,Li Junzhang,Shen Chen,Tian Xia,Lian Jing,Khangale Phathutshedzo,Zhang Xiangjing,Matambo Tonderayi,Hildebrandt Diane,Liu Xinying,Liu Shouxin

High levels of nitrates and nitrites not only threaten aquatic ecosystems and drinking water safety but also impair the biodegradation efficiency of industrial wastewater. In this study, micro-nano-MoS 2 -1013 (0.04 g/L) enhanced denitrification by 56.9% and 29.6% in steel pickling and meat processing wastewaters, respectively, and improved chemical oxygen demand (COD) removal by 136.7% in refinery cooling wastewater under continuous-flow conditions using a 3.5 L upflow anaerobic sludge blanket (UASB) reactor. The catalytic effect of micro-nano-MoS 2 on denitrification was achieved by stimulating an increase in the abundance of denitrification genes and the transcript levels of narL (93.82 times), narG (16.34 times), and nirK (12.27 times) within the bacterial cells, which led to an increase in the expression levels of denitrifying enzymes. These findings have significant implications for the design and optimization of biodegradation processes and bio-denitrification systems, particularly for the treatment of high-concentration nitrate wastewater.

Efficient and Green Strategy of Ultrasound-Assisted Liquid-Phase Exfoliation of MoS2 Nanosheets

Xiaoke Zhang,Shiwei Yuan,Yongqi Li,Zhongyang Wang,Wenran Feng

Two-dimensional molybdenum disulfide (2D MoS2) holds significant promise for the development of various photoelectric devices due to its unique atomic thin layer and band gap characteristics. Numerous techniques have made strides in exfoliating 2D MoS2 nanosheets from their bulk counterparts. However, achieving environmentally benign and efficient preparation of high-quality MoS2 nanosheets remains challenging. Here, we develop a green and efficient approach to preparing MoS2 nanosheets through ultrasound-assisted liquid-phase exfoliation using sustainable alcohol solvents. Systematic investigations reveal that solvent selection critically governs both the exfoliation efficiency and structural preservation of MoS2 nanoflower precursors synthesized via hydrothermal methods. Comprehensive characterization confirms that ethanol-mediated exfoliation yields intact 2H phase nanosheets. For other solvents, however, chemical doping during exfoliation resulted in the emergence of the 1T phase within the nanosheets. Notably, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and isopropanol (IPA) induce detrimental aggregation and methanol (MeOH) causes structural fragmentation, leading to the least effective exfoliating outcome. Through first-principles calculations and considering the efficiency of chemical doping, ethanol (EtOH) was identified as the optimal solvent for the exfoliation of MoS2 nanosheets. This work establishes an eco-friendly pathway for producing phase-modulated MoS2 nanosheets, demonstrating remarkable potential for sustainable manufacturing of 2D materials.

Flexible MoS2-based wearable SERS sensor for noninvasive early diagnosis of glutaric acidemia

Qi Liu,Wenrou Yu,Luo Ren,Anping Liu,Zhaoxian Chen,Xuliang Xia,Yuqin Xie,Yingzhou Huang

Ammonium fluoride regulated CoMoS4-derived Co9S8@MoS2 composite for high-performance hybrid supercapacitor

Xiaoyang Xu,Ting Wei,Rui Xiong,Zhenni Zhang,Xiangjing Zhang,Shanlin Qiao,Qing Li,Yongqi Hu

The high-performance Co 9 S 8 @MoS 2 composite was firstly prepared though the ammonium fluoride regulated CoMoS 4 -derived process by a simple one-step hydrothermal method , without the previous complicated and tedious preparation procedures. Moreover, it can exhibit the ultrahigh specific capacity of 213 mAh/g at 1 A/g, owing to the multiple oxidation state of Co/Mo, conductivity superiority of metallic sulfides and suitable structure. In order to simulate the application indicators of Co 9 S 8 @MoS 2 composite for commercial supercapacitors , the Co 9 S 8 @MoS 2 //AC hybrid supercapacitor device was well designed by the optimized Co 9 S 8 @MoS 2 composite and commercial active carbon (AC) as positive/negative electrode respectively, and exhibits the good electrochemical properties : the high energy density of 42 Wh/kg at 375 W/kg, and even still maintain 25 Wh/kg at the high power density of 2250 W/kg; and excellent cycle stability with no significant reduction of capacity retention after 9000 cycles. This work can not only provide a simple one-step hydrothermal preparation method of Co 9 S 8 @MoS 2 composite, but also confirm its promising application prospects in supercapacitor electrode materials.

Transition Metal-Doped Edge-Terminated MoS2 Superstructures as Efficient Catalysts for H2 Production

Jiabao Ding,Qi Shao,Shuxing Bai,Xiaoqing Huang

As the most important layered transition metal dichalcogenide, molybdenum disulfide (MoS 2 ) is applicable for simultaneous H 2 production and CO elimination by water-gas shift reaction (WGSR), while its performance is still not satisfactory. To further promote the catalytic activities of MoS 2 , herein a series of transition metals (M = Mn, Fe, Co, Ni, Cu, and Zn) into the column-like superstructures with edge-terminated MoS 2 nanosheet building blocks (termed as M-ET MoS 2 SSs) is doped as the efficient catalysts for WGSR. A precise M doping into ET MoS 2 SSs reveals that the M-ET MoS 2 SSs exhibit the volcano-like activity toward WGSR as a function of specific M with the 5%Ni-ET MoS 2 SSs displaying the best average rate of 50.48 µmol H2 g cat. −1 s −1 in WGSR at 473 K, which is 4 and 13 times higher than those of the ET MoS 2 SSs and commercial MoS 2 , respectively, and is even comparable to many noble-metal-based catalysts. The valence band spectra reveal that the boosted WGSR activity of 5%Ni-ET MoS 2 SSs can be ascribed to the downshift of the d-band center relative to the Fermi level, which facilitates the H desorption to produce H 2 in WGSR, showing a highly efficient and earth-abundant catalysts for WGSR and beyond.

Magnetic MoS2 nanosheets as recyclable solar-absorbers for high-performance solar steam generation

Qingmiao Wang,Yi Qin,Feifei Jia,Yanmei Li,Shaoxian Song

To deal with water scarcity, solar steam generation has been widely regarded as one of the promising methods for freshwater production. In this work, for the first time, a novel recyclable MoS 2 -based nanocomposite (magnetic MoS 2 nanosheets) was fabricated via the in-situ growth of nano Fe 3 O 4 on the polydopamine (PDA)-functionalized MoS 2 nanosheets , and subsequently applied as the solar absorber in the volumetric evaporation systems to generate solar steam. The magnetic MoS 2 nanosheets showed a superhigh solar absorption of over 96% within the whole wavelength range of 200–2500 nm. As a result, a high evaporation efficiency of 79.2% under the low illumination of 2.5 kW m −2 was achieved. In addition, the magnetic MoS 2 nanosheets not only showed the long-term well dispersion in aqueous solution due to the introduction of hydrophilic PDA, but also exhibited a fast and effective separation from aqueous solution with the help of the decorating nano Fe 3 O 4 , which much benefited to the continuously efficient solar steam generation and its good recyclability , respectively. Therefore, the MoS 2 -based nanomaterials in this work showed good prospects for solar energy harvesting .

Tailorable MoS2 quantum dots nanofluids via coordination-confined growth for high-performance lubrication

Ru Yan,Hongyang Wang,Rui Dong,Ping Wen,Mingjin Fan

Conventional solvent-free nanofluids hold promise as lubricants but often face challenges in intricate preparation and unadjustable performance. Herein, we developed a facile one-pot strategy for synthesizing MoS 2 quantum dots (QDs) nanofluids (MoNFs) via a coordination-confined growth approach, which features cyan-fluorescent with an average size of 3.8 nm, homogeneously dispersed in a tailored ionic liquid matrix. The resulting MoNFs exhibit tunable viscosity and desirable shear-thinning behavior. When evaluated as lubricants, the optimal formulation (3MoNFs) decreases wear volume by 73.8% compared to the base fluid. Comprehensive characterization of worn track reveals a triplex synergistic lubrication integrating an electric-double-layer film, tribochemical reaction film and solid-like nanofluid layer, concurrently assisted with repairing pre-existing wear scars. Impressively, blending merely 0.7 wt% 3MoNFs into commercial SN 0 W-30 engine oil enhances its anti-wear performance by 47.5%, demonstrating outstanding potential for high-performance lubricants.

Fabrication of Bi4Ti3O12/MoS2 heterojunctions for efficient piezocatalytic degradation of ciprofloxacin in water

Ruihan Du,Shuyi Yu,Lu Kang,Longyun Li,Chunli Kang

Traditional water treatment methods still face limitations in addressing environmental and health concerns posed by antibiotic pollutants. Piezoelectric catalysis, as an emerging environmental remediation technology, demonstrates potential in this regard due to its highly efficient catalytic activity. Based on this, this study constructed a binary n-n Type-II heterojunction piezoelectric catalytic material, Bi 4 Ti 3 O 12 /MoS 2 (BTO/MS), for the efficient removal of ciprofloxacin (CIP). A series of BTO/MS composites were synthesized via a simple hydrothermal method, with the 5%BTO/MS composite exhibiting optimal piezocatalytic performance toward CIP: Under conditions of 100 W ultrasonication for 60 min, the removal rate of 10 mg/L CIP reached 94.46%, with an apparent reaction rate constant of 0.0539 min −1 . This represents a 3.46-fold and 17.39-fold increase over pure MoS 2 and pure Bi 4 Ti 3 O 12 , respectively. The composite structure effectively mitigated MoS 2 nanosheet agglomeration and suppressed electron-hole pair recombination via an n-n Type-II heterojunction, significantly enhancing the piezoelectric catalytic activity of 5%BTO/MS. Electron paramagnetic resonance (EPR) results indicate that singlet oxygen ( 1 O 2 ) and superoxide radical (·O 2 − ) are the dominant reactive oxygen species governing the piezoelectric catalytic degradation process. Simulations using T.E.S.T. software revealed that most intermediates exhibited reduced ecotoxicity compared to the parent compound CIP. Additionally, 5%BTO/MS demonstrated excellent catalytic performance in removing CIP from tap water and lake water matrices, as well as in degrading other organic pollutants, indicating the material's promising application potential in the field of piezoelectric catalytic water purification.