Nano Letters最新文献_第9页

Emissive Traps Lead to Asymmetric Photoluminescence Line Shape in Spheroidal CsPbBr3 Quantum Dots

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.4c04995

Jessica Kline, Shaun Gallagher, Benjamin F. Hammel, Reshma Mathew, Dylan M. Ladd, Robert J. E. Westbrook, Jalen N. Pryor, Michael F. Toney, Matthew Pelton, Sadegh Yazdi, Gordana Dukovic, David S. Ginger

{"title":"Emissive Traps Lead to Asymmetric Photoluminescence Line Shape in Spheroidal CsPbBr3 Quantum Dots","authors":"Jessica Kline, Shaun Gallagher, Benjamin F. Hammel, Reshma Mathew, Dylan M. Ladd, Robert J. E. Westbrook, Jalen N. Pryor, Michael F. Toney, Matthew Pelton, Sadegh Yazdi, Gordana Dukovic, David S. Ginger","doi":"10.1021/acs.nanolett.4c04995","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04995","url":null,"abstract":"The morphology of quantum dots plays an important role in governing their photophysics. Here, we explore the photoluminescence of spheroidal CsPbBr3 quantum dots synthesized via the room-temperature trioctylphosphine oxide/PbBr2 method. Despite photoluminescence quantum yields nearing 100%, these spheroidal quantum dots exhibit an elongated red photoluminescence tail not observed in typical cubic quantum dots synthesized via hot injection. We explore the origins of this elongated red tail through structural and optical characterization including small-angle X-ray scattering, transmission electron microscopy and time-resolved, steady-state, and single quantum dot photoluminescence. From these measurements we conclude that the red tail originates from emissive traps. We show that treating spheroidal quantum dots with phenethylammonium bromide decreases the line shape asymmetry and increases passivation–consistent with emissive traps due to polar facets.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"29 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

La Doping LiNiO2 Cathode to Immobilize the Lattice Oxygen for Highly Stable Lithium-Ion Batteries

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00031

Mei-Tong Wei, Lu Wu, Zhi-Yi Hu, Kun-Xiao Wu, Jing-Yi Sun, Zhi-Wen Yin, Zhi-Rong Li, Xiao-Yu Yang, Yu Li, Gustaaf Van Tendeloo, Bao-Lian Su

{"title":"La Doping LiNiO2 Cathode to Immobilize the Lattice Oxygen for Highly Stable Lithium-Ion Batteries","authors":"Mei-Tong Wei, Lu Wu, Zhi-Yi Hu, Kun-Xiao Wu, Jing-Yi Sun, Zhi-Wen Yin, Zhi-Rong Li, Xiao-Yu Yang, Yu Li, Gustaaf Van Tendeloo, Bao-Lian Su","doi":"10.1021/acs.nanolett.5c00031","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00031","url":null,"abstract":"LiNiO2 (LNO) with a high theoretical capacity and entirely free of cobalt has aroused much attention as a promising cathode material for lithium-ion batteries (LIBs). The rapid capacity decay, however, obstructs its commercialization. We first propose a strategy of La lattice-doping in the LNO (La-LNO) as a high-stability cathode for LIBs. Density-functional theory calculations suggest that the La dopant occupies the Ni-sites to stabilize the lattice oxygen due to a strengthening of the transition metal–oxygen bonds and mitigation of the charge compensation. La lattice-doped LNO cathode materials were fabricated successfully and had a specific capacity of 159.6 mAh g–1 after 100 cycles at 1 C with a capacity retention of 94.2% and a voltage retention of 99.9%. Atomic characterization reveals that La-LNO effectively inhibits the oxygen release and phase transformation during the cycling process. Our strategy provides leading guidance for designing practical high-performance LNO cathode materials for advanced LIBs.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"16 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stable Semitransparent All-Polymer Solar Cells with Color-Tunable Reflection and Neutral Transmission

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00246

Shilin Li, Linge Xiao, Hong Zhang, Yingyu Zhang, Weichao Zhang, Huiqiong Zhou, Yuan Zhang

引用次数: 0

Emissive Traps Lead to Asymmetric Photoluminescence Line Shape in Spheroidal CsPbBr3 Quantum Dots

IF 9.6 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.4c0499510.1021/acs.nanolett.4c04995

Jessica Kline, Shaun Gallagher, Benjamin F. Hammel, Reshma Mathew, Dylan M. Ladd, Robert J. E. Westbrook, Jalen N. Pryor, Michael F. Toney, Matthew Pelton, Sadegh Yazdi, Gordana Dukovic and David S. Ginger*,

{"title":"Emissive Traps Lead to Asymmetric Photoluminescence Line Shape in Spheroidal CsPbBr3 Quantum Dots","authors":"Jessica Kline, Shaun Gallagher, Benjamin F. Hammel, Reshma Mathew, Dylan M. Ladd, Robert J. E. Westbrook, Jalen N. Pryor, Michael F. Toney, Matthew Pelton, Sadegh Yazdi, Gordana Dukovic and David S. Ginger*, ","doi":"10.1021/acs.nanolett.4c0499510.1021/acs.nanolett.4c04995","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04995https://doi.org/10.1021/acs.nanolett.4c04995","url":null,"abstract":"The morphology of quantum dots plays an important role in governing their photophysics. Here, we explore the photoluminescence of spheroidal CsPbBr3 quantum dots synthesized via the room-temperature trioctylphosphine oxide/PbBr2 method. Despite photoluminescence quantum yields nearing 100%, these spheroidal quantum dots exhibit an elongated red photoluminescence tail not observed in typical cubic quantum dots synthesized via hot injection. We explore the origins of this elongated red tail through structural and optical characterization including small-angle X-ray scattering, transmission electron microscopy and time-resolved, steady-state, and single quantum dot photoluminescence. From these measurements we conclude that the red tail originates from emissive traps. We show that treating spheroidal quantum dots with phenethylammonium bromide decreases the line shape asymmetry and increases passivation–consistent with emissive traps due to polar facets.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 13","pages":"5063–5070 5063–5070"},"PeriodicalIF":9.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Permanent Dipole Moment in a Quantum-Confined Two-Dimensional Metal Revealed by Electric Double Layer Gating

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00500

Nader Sawtarie, Jonathon R. Schrecengost, Krishnan Mekkanamkulam Ananthanarayanan, Nithil Harris Manimaran, Shubham Sukumar Awate, Chengye Dong, Ke Xu, Yuanxi Wang, Joshua A. Robinson, Noel C. Giebink, Susan K. Fullerton-Shirey

{"title":"Permanent Dipole Moment in a Quantum-Confined Two-Dimensional Metal Revealed by Electric Double Layer Gating","authors":"Nader Sawtarie, Jonathon R. Schrecengost, Krishnan Mekkanamkulam Ananthanarayanan, Nithil Harris Manimaran, Shubham Sukumar Awate, Chengye Dong, Ke Xu, Yuanxi Wang, Joshua A. Robinson, Noel C. Giebink, Susan K. Fullerton-Shirey","doi":"10.1021/acs.nanolett.5c00500","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00500","url":null,"abstract":"The tunable optical properties of metals through size-dependent quantum effects have attracted attention due to synthesis of chemically stable, ultrathin, and two-dimensional metals. Gate tunability, from the reduced screening of low-dimensional metals, adds an additional route for control over optical properties. Here, two-dimensional (2D) Ga is synthesized via confinement heteroepitaxy and patterned into electric-double-layer (EDL) gated transistors. 2D Ga is predicted to have an out-of-plane permanent dipole moment resulting from a non-centrosymmetric interface. Alternating current EDL gating induces a measurable change in 2D Ga reflectivity of ΔR/R ∼ 8 × 10–4. The optical response is dominated by a linear Stark shift of 1.8 meV, corresponding to a 0.4 D change in the permanent dipole moment between the ground and excited states of 2D Ga. These results are the first demonstration of 2D metal gating and the first direct evidence of a permanent dipole moment in a 2D metal.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"57 19 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In Situ Gas-Phase 4D-STEM for Strain Mapping during Hydride Formation in Palladium Nanocubes

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00702

Marta Perxés Perich, Jan-Willem Lankman, Claudia J. Keijzer, Jessi E. S. van der Hoeven

引用次数: 0

Enhanced Sonodynamic Cancer Therapy through Boosting Reactive Oxygen Species and Depleting Glutathione

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00946

Nannan Zheng, Dan Li, Xin Hu, Li Yan, Ling-yun Ding, Juan Feng, Tao Ji, Shuqing He, Yudai Huang, Junqing Hu

{"title":"Enhanced Sonodynamic Cancer Therapy through Boosting Reactive Oxygen Species and Depleting Glutathione","authors":"Nannan Zheng, Dan Li, Xin Hu, Li Yan, Ling-yun Ding, Juan Feng, Tao Ji, Shuqing He, Yudai Huang, Junqing Hu","doi":"10.1021/acs.nanolett.5c00946","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00946","url":null,"abstract":"The complex tumor microenvironment (TME) affects reactive oxygen species (ROS)-based therapies; breaking the limitations of the TME to enhance the effectiveness of sonodynamic therapy (SDT) is full of great challenges. Herein, iron atomically dispersed nanoparticles (Fe–N–C) were first reported as sonosensitizers with highly efficient ROS generation by overcoming TME limitations. Its peroxidase and catalase-like activities catalyze H2O2 to produce highly toxic ·OH and in situ O2, respectively, and then O2 molecules adsorbed at Fe active sites obviously lower the energy barrier for ·OH formation. Meanwhile, its glutathione-oxidase-like activity can rapidly consume glutathione (GSH) in the TME to induce tumor cell apoptosis and ferroptosis. Density functional theory calculation results elucidate the possible mechanism of ROS generation: O2 molecules are activated by receiving sonoelectrons to generate ·O2–, which further reacts with H2O to produce OH–. Then OH– is oxidized by sonoholes to form ·OH. Fe–N–C displays a superior tumor specificity SDT.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"71 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconfigurable Neuromorphic Computing Using Methyl-Engineered One-Dimensional Covalent Organic Framework Memristors

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c00890

Pan-Ke Zhou, Ziyue Yu, Tao Zeng, Cong Zhang, Yuxing Huang, Qian Chen, Chao Lin, Liming Zhao, Xiong Chen

{"title":"Reconfigurable Neuromorphic Computing Using Methyl-Engineered One-Dimensional Covalent Organic Framework Memristors","authors":"Pan-Ke Zhou, Ziyue Yu, Tao Zeng, Cong Zhang, Yuxing Huang, Qian Chen, Chao Lin, Liming Zhao, Xiong Chen","doi":"10.1021/acs.nanolett.5c00890","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00890","url":null,"abstract":"The rapid evolution of neuromorphic devices seeks to bridge biological neural networks and artificial systems, enabling energy-efficient and scalable computing for next-generation artificial intelligence. Herein, we introduce methyl-engineered one-dimensional covalent organic framework (1D COF)-based memristors as a transformative platform for reconfigurable neuromorphic computing. The incorporation of methyl groups enhances localized polarization effects within the COF framework, effectively mitigating random Ag+ migration/diffusion and stabilizing conductive filament morphology. This strategic modification yields devices with exceptional multilevel storage capabilities, exhibiting superior stability, linearity, and reproducibility. Moreover, the highly ordered architecture and customizable chemical environment of the methyl-functionalized 1D COF allows for precise control over resistive switching behaviors, facilitating the emulation of synaptic functions and the development of artificial neural network architectures. Demonstrating exceptional performance in neuromorphic tasks such as high-accuracy image recognition, these devices showcase significant promise as the foundation for energy-efficient, next-generation neuromorphic computing systems.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"49 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of Nanographene–DNA Conjugates and Their Profiling with MoS2 Nanopores

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.4c06641

Jehad Abourahma, Thanuka Udumulla, Ruojie Sha, James W. Canary, Alexander Sinitskii

{"title":"Synthesis of Nanographene–DNA Conjugates and Their Profiling with MoS2 Nanopores","authors":"Jehad Abourahma, Thanuka Udumulla, Ruojie Sha, James W. Canary, Alexander Sinitskii","doi":"10.1021/acs.nanolett.4c06641","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06641","url":null,"abstract":"We demonstrate the possibility of covalently bonded hybrid DNA–graphene materials by synthesizing a model DNA–polycyclic aromatic hydrocarbon (PAH) conjugate comprising a 33mer oligonucleotide containing thymine and uridine modified with bispyrenyl benzene. This DNA–PAH conjugate (T13UPAHT19; T = thymine, UPAH = PAH-modified uridine) has an atomically thin nanographene protrusion extending by only about 1 nm from the single-stranded DNA (ssDNA). We show that DNA–PAH conjugates can be characterized with high resolution by profiling with a nanopore in a monolayer MoS2 membrane. The profiling experiments provided sufficient resolution to distinguish the thymine and PAH-modified regions of T13UPAHT19 and confirm the asymmetry of the PAH attachment relative to the 3′ and 5′ ends of the ssDNA due to different lengths of the T13 and T19 segments. This work provides the foundation for further exploration of DNA–graphene hybrids, demonstrating an example of their synthesis and the utility of nanopore profiling for their structural characterization with an ∼1 nm resolution.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"17 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

La Doping LiNiO2 Cathode to Immobilize the Lattice Oxygen for Highly Stable Lithium-Ion Batteries

IF 9.6 1区材料科学

Nano Letters Pub Date : 2025-03-25 DOI: 10.1021/acs.nanolett.5c0003110.1021/acs.nanolett.5c00031

Mei-Tong Wei, Lu Wu, Zhi-Yi Hu*, Kun-Xiao Wu, Jing-Yi Sun, Zhi-Wen Yin, Zhi-Rong Li, Xiao-Yu Yang, Yu Li*, Gustaaf Van Tendeloo and Bao-Lian Su*,

{"title":"La Doping LiNiO2 Cathode to Immobilize the Lattice Oxygen for Highly Stable Lithium-Ion Batteries","authors":"Mei-Tong Wei, Lu Wu, Zhi-Yi Hu*, Kun-Xiao Wu, Jing-Yi Sun, Zhi-Wen Yin, Zhi-Rong Li, Xiao-Yu Yang, Yu Li*, Gustaaf Van Tendeloo and Bao-Lian Su*, ","doi":"10.1021/acs.nanolett.5c0003110.1021/acs.nanolett.5c00031","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00031https://doi.org/10.1021/acs.nanolett.5c00031","url":null,"abstract":"LiNiO2 (LNO) with a high theoretical capacity and entirely free of cobalt has aroused much attention as a promising cathode material for lithium-ion batteries (LIBs). The rapid capacity decay, however, obstructs its commercialization. We first propose a strategy of La lattice-doping in the LNO (La-LNO) as a high-stability cathode for LIBs. Density-functional theory calculations suggest that the La dopant occupies the Ni-sites to stabilize the lattice oxygen due to a strengthening of the transition metal–oxygen bonds and mitigation of the charge compensation. La lattice-doped LNO cathode materials were fabricated successfully and had a specific capacity of 159.6 mAh g–1 after 100 cycles at 1 C with a capacity retention of 94.2% and a voltage retention of 99.9%. Atomic characterization reveals that La-LNO effectively inhibits the oxygen release and phase transformation during the cycling process. Our strategy provides leading guidance for designing practical high-performance LNO cathode materials for advanced LIBs.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 13","pages":"5265–5273 5265–5273"},"PeriodicalIF":9.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0