ACS Nano最新文献

Monolayer WSe2 Field-Effect Transistor Performance Enhancement by Atomic Defect Engineering and Passivation

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-27 DOI: 10.1021/acsnano.4c16831

Yuanqiu Tan, Shao-Heng Yang, Chih-Pin Lin, Fernando J. Vega, Jun Cai, Hao-Yu Lan, Rahul Tripathi, Sahej Sharma, Zhongxia Shang, Tuo-Hung Hou, Thomas E. Beechem, Joerg Appenzeller, Zhihong Chen

{"title":"Monolayer WSe2 Field-Effect Transistor Performance Enhancement by Atomic Defect Engineering and Passivation","authors":"Yuanqiu Tan, Shao-Heng Yang, Chih-Pin Lin, Fernando J. Vega, Jun Cai, Hao-Yu Lan, Rahul Tripathi, Sahej Sharma, Zhongxia Shang, Tuo-Hung Hou, Thomas E. Beechem, Joerg Appenzeller, Zhihong Chen","doi":"10.1021/acsnano.4c16831","DOIUrl":"https://doi.org/10.1021/acsnano.4c16831","url":null,"abstract":"Monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) have emerged as leading candidates for next-generation electronic devices beyond silicon, owing to their atomically thin structure and superior electrostatic control. However, their integration into industrial applications remains limited due to high densities of lattice defects and challenges in achieving stable and effective doping. In this work, we present a passivation and doping technique that significantly recovers and enhances the electrical properties of monolayer tungsten diselenide (WSe2). Our defect-facilitated (NH4)2S surface passivation approach has achieved robust enhancements in both the on-state and off-state performance of monolayer WSe2 p-type field-effect transistors (p-FETs), enhancing channel mobility 3-fold, reaching a subthreshold slope (SSmin) value of 70 mV/dec, on-currents of 110 μA/μm, and Imax/Imin > 109, while maintaining stability across a range of conditions. Furthermore, we establish a strong correlation between device off-state performance and the full width at half-maximum (fwhm) of the Raman characterization peak. The defect engineering approach, combined with (NH4)2S treatment at room temperature, offers a viable pathway for passivation and substitutional doping, advancing the potential for improved charge transport in future 2D TMD-based electronic devices.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"70 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506964","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

Ozonated Monolayer Graphene for Extended Performance and Durability in Hydrogen Fuel Cell Electric Vehicles

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-27 DOI: 10.1021/acsnano.5c02055

Shanmukh Kutagulla, Patrick Carmichael, Matthew Coupin, Devi Mutyala, Nicholas Ignacio, Nam Hoang Le, Isabel Terry Caldino Bohn, Ji-Won Kim, Keldy Stephen Mason, Jamie Warner, Narayana Aluru, Brian A. Korgel, Zachariah A. Page, Deji Akinwande

{"title":"Ozonated Monolayer Graphene for Extended Performance and Durability in Hydrogen Fuel Cell Electric Vehicles","authors":"Shanmukh Kutagulla, Patrick Carmichael, Matthew Coupin, Devi Mutyala, Nicholas Ignacio, Nam Hoang Le, Isabel Terry Caldino Bohn, Ji-Won Kim, Keldy Stephen Mason, Jamie Warner, Narayana Aluru, Brian A. Korgel, Zachariah A. Page, Deji Akinwande","doi":"10.1021/acsnano.5c02055","DOIUrl":"https://doi.org/10.1021/acsnano.5c02055","url":null,"abstract":"In the landscape of proton exchange membrane fuel cells (PEMFCs), there is a strong need for durable, low hydrogen crossover membranes that retain high current output and proton conductivity during operation. This study presents the use of UV-Ozone induced defects in graphene to eliminate the proton conductivity penalty commonly associated with traditional crossover mitigation strategies. We report a defect engineered graphene material that demonstrates an increase in hydrogen/proton selectivity of 27%, a decrease in H2 crossover of 24%, with limited to no impact on current output. Furthermore, we demonstrate a membrane that is 39% more durable than state of the art GORE Select membranes and shows no loss in performance after a 100 h accelerated stress test (AST). This study illustrates the viability of 2D material membranes to sieve between H2 and H3O+ in industrial testing conditions and serve as highly scalable and durable fuel cell membranes that represent a significant upgrade over current state of the art membranes for hydrogen fuel cell vehicles and clean energy generation.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"16 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506830","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

Operando Photoemission Imaging of the Energy Landscape from a 2D Material-Based Field-Effect Transistor.

IF 15.8 1区材料科学

ACS Nano Pub Date : 2025-02-27 DOI: 10.1021/acsnano.5c00256

Dario Mastrippolito, Mariarosa Cavallo, Davy Borowski, Erwan Bossavit, Clement Gureghian, Albin Colle, Tommaso Gemo, Adrien Khalili, Huichen Zhang, Ankita Ram, Erwan Dandeu, Sandrine Ithurria, Johan Biscaras, Pavel Dudin, Jean-Francois Dayen, José Avila, Emmanuel Lhuillier, Debora Pierucci

{"title":"Operando Photoemission Imaging of the Energy Landscape from a 2D Material-Based Field-Effect Transistor.","authors":"Dario Mastrippolito, Mariarosa Cavallo, Davy Borowski, Erwan Bossavit, Clement Gureghian, Albin Colle, Tommaso Gemo, Adrien Khalili, Huichen Zhang, Ankita Ram, Erwan Dandeu, Sandrine Ithurria, Johan Biscaras, Pavel Dudin, Jean-Francois Dayen, José Avila, Emmanuel Lhuillier, Debora Pierucci","doi":"10.1021/acsnano.5c00256","DOIUrl":"https://doi.org/10.1021/acsnano.5c00256","url":null,"abstract":"As the integration of transition metal dichalcogenides (TMDC) becomes more advanced for optoelectronics, it is increasingly relevant to develop tools that can correlate the structural properties of the materials with their electrical output. To do so, the determination of the electronic structure must go beyond the hypothesis that the properties of the pristine material remain unaffected after the device integration, which generates changes in the dielectric environment, including electric fields that are likely to renormalize the electronic spectrum. Here, we demonstrate that nanobeam photoemission spectroscopy is a well-suited tool to unveil the device energy landscape under operando conditions. Both the gate vertical field and the drain in-plane vectorial electric field can be determined with a sub-μm resolution. We provide a correlative description of a field-effect transistor to connect its bias-modified energy landscape with the transistor electrical output. The method appears highly suited to unveil how the actual geometry of the flake (thickness, edge effect, presence of structural defects, etc.) is driving the current flow within the device. Lastly, the method appears fully compatible with traditional device fabrication, therefore making it relevant for systematic rational optimization of TMDC-based electronic devices.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":" ","pages":""},"PeriodicalIF":15.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513993","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

Stabilizing Li-Metal Electrode via Anion-Induced Desolvation in a Covalent Organic Framework Separator

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-27 DOI: 10.1021/acsnano.5c00165

Jia Chen, Zhuozhuo Tang, Da Zhu, Li Sheng, Kai Yang, Zhiguo Zhang, Jianlong Wang, Yaping Tang, Xiangming He, Hong Xu

{"title":"Stabilizing Li-Metal Electrode via Anion-Induced Desolvation in a Covalent Organic Framework Separator","authors":"Jia Chen, Zhuozhuo Tang, Da Zhu, Li Sheng, Kai Yang, Zhiguo Zhang, Jianlong Wang, Yaping Tang, Xiangming He, Hong Xu","doi":"10.1021/acsnano.5c00165","DOIUrl":"https://doi.org/10.1021/acsnano.5c00165","url":null,"abstract":"Although Li-metal batteries have been widely used as high-capacity batteries, they are highly susceptible to electrolytes that lead to dendritic or dead Li growth, which significantly reduces the stability of Li-metal electrodes. Herein, we report an anionic covalent organic framework (sulfonate COF: Bd-COF) as a Li+-solvate dissociator that strips solvent molecules from encapsulated Li+ to stabilize Li-metal electrodes. The homogeneous and dense ionic COF separator was prepared using a template-assisted interface in-suit polymerization engineering. Notably, the well-developed anionic groups within the COF channels could as counter-charge ligands to Li+, that adsorb Li+-solvates and induce their partial desolvation. Meanwhile, the ordered anionic groups on the surface of COF pores provide continuous ion channels for Li+ migration, facilitating the removal of solvent molecules from Li+-solvated species. Combined with the dense nanoporous feature, the COF membrane was found to be effective in suppressing Li-dendrites and parasitic reactions. The Bd-COF/Celgard membrane realizes uniform Li deposition on Li-metal electrodes, exhibiting excellent cycling performance in Li-symmetric batteries and high-voltage Li-metal batteries with LiNi0.6Mn0.2Co0.2O2 cathodes, showcasing the application prospects of ion-conductive covalent organic frameworks in lithium battery separators.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"28 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506828","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

Hydrogel-Coated Polydimethylsiloxane with Reversible Transparency for Advanced Optical Switching

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-27 DOI: 10.1021/acsnano.4c17403

Chenxu Liu, Lin Yang, Yongxiang Sun, Pan Huang, Yuan Yao, Yu Tian, Hongbo Zeng

{"title":"Hydrogel-Coated Polydimethylsiloxane with Reversible Transparency for Advanced Optical Switching","authors":"Chenxu Liu, Lin Yang, Yongxiang Sun, Pan Huang, Yuan Yao, Yu Tian, Hongbo Zeng","doi":"10.1021/acsnano.4c17403","DOIUrl":"https://doi.org/10.1021/acsnano.4c17403","url":null,"abstract":"Functional soft materials that swell in water often exhibit surface wrinkling, similar to the ridges formed on human skin after prolonged immersion, typically leading to reduced optical transmittance. Surprisingly, there is a scarcity of materials that are transparent underwater yet opaque in air, despite their vast potential in applications such as smart windows, periscopes, and information encryption. Herein, we report a hydrogel-based system comprising a polyacrylamide layer on polydimethylsiloxane (PDMS), demonstrating a reversible transition between opacity in air and high transparency in water or wet conditions. Upon water-induced swelling, the transmittance of the hydrogel layer markedly increases from 7.8% in air to 77.1% with excellent repeatability. This behavior enables applications such as optical encryption and decryption and water writing. Micro- and nanostructural analysis reveals that the optical switching arises from the reduction in local surface roughness upon hydrogel swelling. Furthermore, when employed as a smart window, the hydrogel layer effectively reduces solar power transmission by 36%, achieving a temperature reduction of 5.09 °C under direct sunlight while retaining heat in the absence of sunlight. These findings highlight the hydrogel layer on PDMS as a versatile platform for water-responsive smart devices, offering exciting opportunities in optical encryption, interactive writing systems, and energy-efficient window technologies.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"57 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506829","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

Regulating Interfacial Wettability for Fast Mass Transfer in Rechargeable Metal-Based Batteries

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-26 DOI: 10.1021/acsnano.4c17836

Ruijuan Shi, Shilong Jiao, Zirui Yang, Zhihui Bo, Junrong Jiao, Yong Zhao

{"title":"Regulating Interfacial Wettability for Fast Mass Transfer in Rechargeable Metal-Based Batteries","authors":"Ruijuan Shi, Shilong Jiao, Zirui Yang, Zhihui Bo, Junrong Jiao, Yong Zhao","doi":"10.1021/acsnano.4c17836","DOIUrl":"https://doi.org/10.1021/acsnano.4c17836","url":null,"abstract":"The interfacial wettability between electrodes and electrolytes could ensure sufficient physical contact and fast mass transfer at the gas–solid–liquid, solid–liquid, and solid–solid interfaces, which could improve the reaction kinetics and cycle stability of rechargeable metal-based batteries (RMBs). Herein, interfacial wettability engineering at multiphase interfaces is summarized from the electrolyte and electrode aspects to promote the interface reaction rate and durability of RMBs, which illustrates the revolution that is taking place in this field and thus provides inspiration for future developments in RMBs. Specifically, this review presents the principle of interfacial wettability at macro- and microscale and summarizes emerging applications concerning the interfacial wettability effect on mass transfer in RMBs. Moreover, deep insight into the future development of interfacial wettability is provided in the outlook. Therefore, this review not only provides insights into interfacial wettability engineering but also offers strategic guidance for wettability modification and optimization toward stable electrode–electrolyte interfaces for fast mass transfer in RMBs.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"14 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496097","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

High-Brightness Perovskite Light-Emitting Diodes with Suppressed Efficiency Roll-off Using the Green Solvent γ-Valerolactone

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-26 DOI: 10.1021/acsnano.4c17765

Jingjing Cao, Wenji Zhan, Meng Ren, Yao Wang, Haifei Wang, Ni Zhang, Yuetian Chen, Tianfu Wang, Yanfeng Miao, Yixin Zhao

{"title":"High-Brightness Perovskite Light-Emitting Diodes with Suppressed Efficiency Roll-off Using the Green Solvent γ-Valerolactone","authors":"Jingjing Cao, Wenji Zhan, Meng Ren, Yao Wang, Haifei Wang, Ni Zhang, Yuetian Chen, Tianfu Wang, Yanfeng Miao, Yixin Zhao","doi":"10.1021/acsnano.4c17765","DOIUrl":"https://doi.org/10.1021/acsnano.4c17765","url":null,"abstract":"The application of promising perovskite light-emitting diodes (PeLEDs) faces a significant challenge known as efficiency roll-off, which refers to the decline in external quantum efficiency (EQE) at high current densities. This issue arises mainly from high trap densities in perovskite films and imbalanced carrier injection, which limit improvements in brightness and stability of PeLEDs. Here, we develop a green solvent strategy using γ-valerolactone (GVL) to suppress efficiency roll-off in PeLEDs. This strategy effectively slows down the crystallization kinetics, yielding cubic-phase formamidinium lead triiodide (α-FAPbI3) films with reduced trap states, enhanced charge carrier injection, and suppressed Auger recombination. As a result, we achieve a record radiance of 1411 W sr–1 m–2 for GVL-based PeLEDs. These PeLEDs exhibit a substantially reduced efficiency roll-off, maintaining an EQE above 20% even at a high current density of 900 mA cm–2. Our findings highlight the potential of the green solvent approach for developing high-brightness, high-efficiency PeLEDs for practical applications.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"18 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506874","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

Nonmelting Disordering Facilitated by Electron Delocalization

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-26 DOI: 10.1021/acsnano.5c00755

Dasol Kim, Sungwon Kim, Jisu Jung, Jaeseung Kim, Sungwook Choi, Carl-Friedrich Schön, Changwoo Lee, Hyeonwook Lim, Jaehun Jeong, Sanghyuck Yu, Yeonsu Jeong, Hanjoo Lee, Sangsoo Kim, Daewoong Nam, Intae Eom, Dogeun Jang, Kyung Sook Kim, Seongil Im, Seungwu Han, Hyunjung Kim, Mann-Ho Cho

{"title":"Nonmelting Disordering Facilitated by Electron Delocalization","authors":"Dasol Kim, Sungwon Kim, Jisu Jung, Jaeseung Kim, Sungwook Choi, Carl-Friedrich Schön, Changwoo Lee, Hyeonwook Lim, Jaehun Jeong, Sanghyuck Yu, Yeonsu Jeong, Hanjoo Lee, Sangsoo Kim, Daewoong Nam, Intae Eom, Dogeun Jang, Kyung Sook Kim, Seongil Im, Seungwu Han, Hyunjung Kim, Mann-Ho Cho","doi":"10.1021/acsnano.5c00755","DOIUrl":"https://doi.org/10.1021/acsnano.5c00755","url":null,"abstract":"Disordering atomic structures offers a functionality hardly expected in ordered states, including phase-change memory and photonic computing, offering the potential to renovate von Neumann architecture for neuromorphic engineering with low latency. However, significant energy consumption during the disordering compromises the data reliability and integration efficiency, which is traditionally regarded to take place after melting. Here, we investigate time for disordering in isochronal and isochoric manners, challenging the conventional melt-quenching theory. The disordering times of pure Sb, Ag–In–Sb–Te, and In surpass that of InSb by over 50 times, despite a higher melting point and a lower laser absorption rate of Sb compared to InSb. This nontrivial contrast is elucidated by theoretical calculation that delocalized electrons enable flexible modification of bond lengths even below the melting points where undermined bond directionality provides room for atoms to depart from their original positions. Facilitated by delocalized electrons, specifically through metavalent and metallic bonding rather than covalent bonding, atoms can be disordered without undergoing melting, which aligns with the rapid disordering of Sb compared to that of InSb. The results bridge the unaddressed gap between chemical interaction and kinetic behaviors during the disordering and suggest design rules highlighting electron-delocalization rather than solely relying on melting points to improve energy efficiency.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"1 1","pages":""},"PeriodicalIF":17.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496103","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

Machine Learning Assisted Nanofluidic Array for Multiprotein Detection

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-26 DOI: 10.1021/acsnano.4c13543

Wenjing Chu, Mengyu Yang, Zhiwei Shang, Jing Zhao, Yuling Xiao, Jing Pan, Xiaoqing Yi, Meihua Lin, Fan Xia

引用次数: 0

Chemical Activation of a Single Melamine Molecule via Isomerization Followed by Metalation with a Copper Atom

IF 17.1 1区材料科学

ACS Nano Pub Date : 2025-02-26 DOI: 10.1021/acsnano.4c18832

Karl Rothe, Manex Alkorta, Nicolas Néel, Thomas Frederiksen, Jörg Kröger

引用次数: 0