Pub Date : 2025-12-09DOI: 10.1021/acs.nanolett.5c05147
Xinyu Wang,Xiaofeng Chen,Yingjie Zhu,Jiahong Chen,Guiyan Yang,Guozhi Chai,Jian Zhang,Zongbin Hao,Haixiong Ge
Controllable ferromagnetic resonance (FMR) peak shift is essential for spintronics, magnetic memory, and microwave sensing. However, realizing low-cost, nanoscale, and artificially tunable FMR remains challenging. Here, a nanoimprinting strategy is used to embed humidity-responsive hydrogel cores into magnetic nanocavities, inspired by biological pigment-cell modulation. Reversible swelling of the hydrogel generates localized stress and strain that couple magnetoelastically with the magnetic shell, enabling tunable resonance fields and microwave responses. Cycling tests confirm spontaneous, reversible, and durable modulation of magnetic properties under ambient humidity changes. A comparison between PMNs filled with 0% and 100% hydrogel core yields a resonance-field difference of ∼200 Oe, 3-6 times larger than previously reported values. And the swelling response of the hydrogel core further induces a 143-Oe shift with humidity change, without compromising structural integrity. These humidity-driven, magnetoelastically tunable nanomagnetic units provide a scalable pathway toward adaptive RF components and next-generation electromagnetic stealth materials.
{"title":"Tunable Microwave Magnetism with Humidity Response Inspired by Pigment Cells.","authors":"Xinyu Wang,Xiaofeng Chen,Yingjie Zhu,Jiahong Chen,Guiyan Yang,Guozhi Chai,Jian Zhang,Zongbin Hao,Haixiong Ge","doi":"10.1021/acs.nanolett.5c05147","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c05147","url":null,"abstract":"Controllable ferromagnetic resonance (FMR) peak shift is essential for spintronics, magnetic memory, and microwave sensing. However, realizing low-cost, nanoscale, and artificially tunable FMR remains challenging. Here, a nanoimprinting strategy is used to embed humidity-responsive hydrogel cores into magnetic nanocavities, inspired by biological pigment-cell modulation. Reversible swelling of the hydrogel generates localized stress and strain that couple magnetoelastically with the magnetic shell, enabling tunable resonance fields and microwave responses. Cycling tests confirm spontaneous, reversible, and durable modulation of magnetic properties under ambient humidity changes. A comparison between PMNs filled with 0% and 100% hydrogel core yields a resonance-field difference of ∼200 Oe, 3-6 times larger than previously reported values. And the swelling response of the hydrogel core further induces a 143-Oe shift with humidity change, without compromising structural integrity. These humidity-driven, magnetoelastically tunable nanomagnetic units provide a scalable pathway toward adaptive RF components and next-generation electromagnetic stealth materials.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"132 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704394","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}
The excellent optoelectronic properties of perovskite quantum dots (PeQDs) have great potential in fields such as display, sensing, and encryption. However, the variable application scenarios present challenges to the range and accuracy of their spectral regulation. Here, a Brownian motion collision driven anion exchange strategy is proposed to achieve refined spectral regulation of PeQDs. By modulation of the ionic binding energy of halide particles and PeQDs and control of their collision intensity, the reaction rate and degree of anion exchange can be finely regulated. Consequently, the spectral resolutions of 0.392, 0.238, and 0.550 nm are achieved in the ranges of 470.4-480.2, 514.6-526.3, and 640.3-650.3 nm, respectively. The method can be used to fabricate filters for optical sensing chips. The photoresponse curves reached resolutions of 0.89, 1.15, and 1.39 nm within the ranges of 466.1-481.2, 536.0-553.2, and 677.3-698.1 nm, respectively, demonstrating the potential of this work in the field of spectral sensing.
{"title":"Sub-1 nm Spectral Regulation of Perovskite Quantum Dots via Brownian Motion Collision Driven Anion Exchange.","authors":"Xinrui Chen,Yifei Wang,Hengyang Xiang,Haoqi Li,Wenjun Yuan,Kun Zhang,Xingle Shang,Changjian Dai,Haibo Zeng","doi":"10.1021/acs.nanolett.5c04993","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04993","url":null,"abstract":"The excellent optoelectronic properties of perovskite quantum dots (PeQDs) have great potential in fields such as display, sensing, and encryption. However, the variable application scenarios present challenges to the range and accuracy of their spectral regulation. Here, a Brownian motion collision driven anion exchange strategy is proposed to achieve refined spectral regulation of PeQDs. By modulation of the ionic binding energy of halide particles and PeQDs and control of their collision intensity, the reaction rate and degree of anion exchange can be finely regulated. Consequently, the spectral resolutions of 0.392, 0.238, and 0.550 nm are achieved in the ranges of 470.4-480.2, 514.6-526.3, and 640.3-650.3 nm, respectively. The method can be used to fabricate filters for optical sensing chips. The photoresponse curves reached resolutions of 0.89, 1.15, and 1.39 nm within the ranges of 466.1-481.2, 536.0-553.2, and 677.3-698.1 nm, respectively, demonstrating the potential of this work in the field of spectral sensing.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"138 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145696626","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}
Pub Date : 2025-12-08DOI: 10.1021/acs.nanolett.5c04960
Luca Sacchi, Alfonso Palmieri, Vitthal Mishra, Joon-Suh Park, Marco Piccardo, Federico Capasso
Metasurfaces, planar arrays of subwavelength nanostructures, are typically realized with high-index dielectrics, while low-index platforms are often dismissed due to weaker index contrast. We identify and experimentally verify regimes where a low-index platform (SiO2) surpasses its high-index counterpart (TiO2). A low index suppresses higher-order Bloch modes, enabling the design of efficient devices with relaxed feature sizes. Low-index metasurfaces also offer two intrinsic advantages: a broad, well-behaved chromatic response without explicit dispersion engineering and a strong tolerance to fabrication errors. We validate these features experimentally with silica metagratings, metalenses, and structured-light phase plates at λ = 632 nm. The metagratings reach ≥50% absolute diffraction efficiency over a 200 nm bandwidth, the metalenses deliver 75% absolute diffraction efficiency with diffraction-limited performance, and the vortex phase plates achieve 80% conversion efficiency at the design wavelength and 60% with 100 nm wavelength detuning. These results delineate when low-index metasurfaces outperform high-index designs, suggesting a route to scalable and broadband fabrication of error-resilient flat optics.
{"title":"Silica Meta-Optics: When High Performance Does Not Need a High Index","authors":"Luca Sacchi, Alfonso Palmieri, Vitthal Mishra, Joon-Suh Park, Marco Piccardo, Federico Capasso","doi":"10.1021/acs.nanolett.5c04960","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04960","url":null,"abstract":"Metasurfaces, planar arrays of subwavelength nanostructures, are typically realized with high-index dielectrics, while low-index platforms are often dismissed due to weaker index contrast. We identify and experimentally verify regimes where a low-index platform (SiO<sub>2</sub>) surpasses its high-index counterpart (TiO<sub>2</sub>). A low index suppresses higher-order Bloch modes, enabling the design of efficient devices with relaxed feature sizes. Low-index metasurfaces also offer two intrinsic advantages: a broad, well-behaved chromatic response without explicit dispersion engineering and a strong tolerance to fabrication errors. We validate these features experimentally with silica metagratings, metalenses, and structured-light phase plates at λ = 632 nm. The metagratings reach ≥50% absolute diffraction efficiency over a 200 nm bandwidth, the metalenses deliver 75% absolute diffraction efficiency with diffraction-limited performance, and the vortex phase plates achieve 80% conversion efficiency at the design wavelength and 60% with 100 nm wavelength detuning. These results delineate when low-index metasurfaces outperform high-index designs, suggesting a route to scalable and broadband fabrication of error-resilient flat optics.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"30 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145696996","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}
Pub Date : 2025-12-08DOI: 10.1021/acs.nanolett.5c03736
Yogesh Saravanan, Lorenzo Villanueva, Christian Leveque, Mauro Modesti, Oussama El Far, Claire Valotteau, Felix Rico
The dissociation of the streptavidin–biotin (SA-b) bond has been widely characterized using bulk and single-molecule force spectroscopy (SMFS) techniques. However, dissociation rates (koff) from SMFS (∼10–1 s–1) differ from bulk approaches (∼10–6–10–5 s–1), likely because SMFS measurements are conducted far from equilibrium. Near-equilibrium SMFS requires high-throughput measurements to obtain large enough statistics and high stability over long periods for ultraslow loading force rates measurements, impractical in most SMFS techniques. Here, we developed in situ force calibration strategies for acoustic force spectroscopy to probe SA-b unbinding forces in the near-equilibrium regime, from 10 down to 10–3 pN/s. The resulting koff matches bulk measurements values. Combined with our previous data, we covered 15 orders of magnitude in loading rate, expanding the dynamic range of SMFS and enabling a more complete description of the energy landscape of biomolecular processes.
{"title":"Near-Equilibrium Unbinding of Streptavidin–Biotin Using Single-Molecule Acoustic Force Spectroscopy","authors":"Yogesh Saravanan, Lorenzo Villanueva, Christian Leveque, Mauro Modesti, Oussama El Far, Claire Valotteau, Felix Rico","doi":"10.1021/acs.nanolett.5c03736","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c03736","url":null,"abstract":"The dissociation of the streptavidin–biotin (SA-b) bond has been widely characterized using bulk and single-molecule force spectroscopy (SMFS) techniques. However, dissociation rates (<i>k</i><sub>off</sub>) from SMFS (∼10<sup>–1</sup> s<sup>–1</sup>) differ from bulk approaches (∼10<sup>–6</sup>–10<sup>–5</sup> s<sup>–1</sup>), likely because SMFS measurements are conducted far from equilibrium. Near-equilibrium SMFS requires high-throughput measurements to obtain large enough statistics and high stability over long periods for ultraslow loading force rates measurements, impractical in most SMFS techniques. Here, we developed <i>in situ</i> force calibration strategies for acoustic force spectroscopy to probe SA-b unbinding forces in the near-equilibrium regime, from 10 down to 10<sup>–3</sup> pN/s. The resulting <i>k</i><sub>off</sub> matches bulk measurements values. Combined with our previous data, we covered 15 orders of magnitude in loading rate, expanding the dynamic range of SMFS and enabling a more complete description of the energy landscape of biomolecular processes.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"29 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145696990","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}
Pub Date : 2025-12-08DOI: 10.1021/acs.nanolett.5c04372
Youfa Liu, Sheng Chen, Ao Liu, Zecong Zeng, Yong Wang, Shubing Wei, Zihan Wang, Yutong Li, Yan Huang
Multifunctional hydrogels are widely applied in flexible electronics, energy devices, and sensors due to their unique physical and chemical properties. However, most hydrogels, particularly multifunctional ones, often require complex and time-consuming synthesis processes. Herein, we report a quadruple-functional hydrogel with complete reconstructability (6 cycles, dry fragments), self-healability (100 cycles, wet fragments), ultraextension (retaining >150-fold biaxial extension after reconstruction or self-healing), and redox-activity, synthesized via a simple and rapid method. This approach introduces hydrophobic I3– (endogenously generated from I2 and I–) directly into the polymer solution to trigger the Hofmeister effect in situ, eliminating conventional steps such as cooling-induced shaping and prolonged immersion. Capacitive sensors and self-powered temperature/strain sensor systems by this hydrogel completely retain their original performance after being rebuilt and self-healing. This work demonstrates a facile and efficient strategy for synthesizing multifunctional hydrogels, paving the way for their practical and delicate applications.
{"title":"In Situ Hofmeister Effect in Polymer Solution by Hydrophobic I3– for Multifunctional Hydrogel","authors":"Youfa Liu, Sheng Chen, Ao Liu, Zecong Zeng, Yong Wang, Shubing Wei, Zihan Wang, Yutong Li, Yan Huang","doi":"10.1021/acs.nanolett.5c04372","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04372","url":null,"abstract":"Multifunctional hydrogels are widely applied in flexible electronics, energy devices, and sensors due to their unique physical and chemical properties. However, most hydrogels, particularly multifunctional ones, often require complex and time-consuming synthesis processes. Herein, we report a quadruple-functional hydrogel with complete reconstructability (6 cycles, dry fragments), self-healability (100 cycles, wet fragments), ultraextension (retaining >150-fold biaxial extension after reconstruction or self-healing), and redox-activity, synthesized via a simple and rapid method. This approach introduces hydrophobic I<sub>3</sub><sup>–</sup> (endogenously generated from I<sub>2</sub> and I<sup>–</sup>) directly into the polymer solution to trigger the Hofmeister effect in situ, eliminating conventional steps such as cooling-induced shaping and prolonged immersion. Capacitive sensors and self-powered temperature/strain sensor systems by this hydrogel completely retain their original performance after being rebuilt and self-healing. This work demonstrates a facile and efficient strategy for synthesizing multifunctional hydrogels, paving the way for their practical and delicate applications.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"131 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704818","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}
Pub Date : 2025-12-08DOI: 10.1021/acs.nanolett.5c04496
Zhen-Long Dou,Qin-Xing Zhou,Xiao-Kang Zhong,Zhong-Hua Hao,Li Zhou,Xiaoguang Li,Qu-Quan Wang
Strong coupling of plasmons and excitons induces intriguing hybridized resonances in absorption and scattering processes but often suffers from poor luminescence efficiency. Here, we demonstrate largely enhanced two-photon luminescence (TPL) of Cy5@AgAl hybrids at ambient conditions by adjusting the resonance strength of radiative plasmons and ensemble excitons (αp and αc) and their coupling efficiency (β). The TPL enhancement factor reaches a maximum of 253 at IAgAl(TPL)/ICy5(TPL) = 1.1 and when most ensemble excitons have the same large coupling strength with plasmons. The newly developed linear response theoretical model reveals the unique spectral repartitioning induced by hybridized interference during absorption and radiation processes, and the largest radiative enhancement is attributed to the optimized hybridized interference determined by βαpαc. Our observations provide a strategy to design active photonic nanodevices with optimized radiation ranging from optically hybridized nanoantennas to quantum information processing.
{"title":"Optimizing Strong Coupling of Plasmon-Exciton Hybrids for Largely Enhancing Luminescence.","authors":"Zhen-Long Dou,Qin-Xing Zhou,Xiao-Kang Zhong,Zhong-Hua Hao,Li Zhou,Xiaoguang Li,Qu-Quan Wang","doi":"10.1021/acs.nanolett.5c04496","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04496","url":null,"abstract":"Strong coupling of plasmons and excitons induces intriguing hybridized resonances in absorption and scattering processes but often suffers from poor luminescence efficiency. Here, we demonstrate largely enhanced two-photon luminescence (TPL) of Cy5@AgAl hybrids at ambient conditions by adjusting the resonance strength of radiative plasmons and ensemble excitons (αp and αc) and their coupling efficiency (β). The TPL enhancement factor reaches a maximum of 253 at IAgAl(TPL)/ICy5(TPL) = 1.1 and when most ensemble excitons have the same large coupling strength with plasmons. The newly developed linear response theoretical model reveals the unique spectral repartitioning induced by hybridized interference during absorption and radiation processes, and the largest radiative enhancement is attributed to the optimized hybridized interference determined by βαpαc. Our observations provide a strategy to design active photonic nanodevices with optimized radiation ranging from optically hybridized nanoantennas to quantum information processing.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"3 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145696625","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}
Although there have been remarkable breakthroughs in flexible electronics, the working speed of flexible devices is still relatively slow compared to that of rigid substrates. Furthermore, the frequency gap between the sensed physiological signal and the wireless communication carrier wave has been enlarged with the advancement of wireless communication technology. Here, based on advantages of the aligned carbon nanotube (ACNT), we developed devices on polyimide (PI) substrates with an intrinsic cutoff frequency (fc) of more than 300 GHz and into the THz region. Furthermore, frequency mixers and phase shifters built by ACNT-based diodes are demonstrated with conversion gain ranging from −11.5 to −18 dB and output maximum relative phase shifting of 55° having average insertion loss of about 3.9 dB. All performances were achieved from flexible devices working at a mmWave band from 30 to 40 GHz, and for the first time, they were comparable to that built by active transistors from conventional semiconductors.
{"title":"Aligned Carbon Nanotube-Based Terahertz Flexible Diodes for Frequency Conversion and Phase Shift at Millimeter Wave Band","authors":"Zheng Wang, Yaxin Li, Haitao Li, Zhichao Yin, WenQi Li, Jian Shu, Li Ding","doi":"10.1021/acs.nanolett.5c05263","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c05263","url":null,"abstract":"Although there have been remarkable breakthroughs in flexible electronics, the working speed of flexible devices is still relatively slow compared to that of rigid substrates. Furthermore, the frequency gap between the sensed physiological signal and the wireless communication carrier wave has been enlarged with the advancement of wireless communication technology. Here, based on advantages of the aligned carbon nanotube (ACNT), we developed devices on polyimide (PI) substrates with an intrinsic cutoff frequency (<i>f</i><sub>c</sub>) of more than 300 GHz and into the THz region. Furthermore, frequency mixers and phase shifters built by ACNT-based diodes are demonstrated with conversion gain ranging from −11.5 to −18 dB and output maximum relative phase shifting of 55° having average insertion loss of about 3.9 dB. All performances were achieved from flexible devices working at a mmWave band from 30 to 40 GHz, and for the first time, they were comparable to that built by active transistors from conventional semiconductors.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"139 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704819","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}
Pub Date : 2025-12-07DOI: 10.1021/acs.nanolett.5c04228
Julia Kucharek, Mateusz Raczyński, Rafał Bożek, Anna Kaleta, Bogusława Kurowska, Marta Bilska, Sławomir Kret, Takashi Taniguchi, Kenji Watanabe, Piotr Kossacki, Mateusz Goryca, Wojciech Pacuski
A three-step process was developed for growing high-quality, optically uniform WSe2 monolayers by molecular beam epitaxy (MBE), taking advantage of the use of hexagonal boron nitride (hBN) as a substrate. The process was optimized to maximize the efficiency of photoluminescence and promote the formation of hexagonal WSe2 domains. Atomic force microscopy was employed to estimate the dispersion of the WSe2 hexagonal domains' orientation. Monolayer character of the film was identified using optical methods and verified with a high-resolution transmission electron microscopy cross-section. Temperature- and magnetic-field-dependent studies revealed the behavior of exciton complexes to be analogous to that of exfoliated counterparts. Direct growth on hBN, combined with a uniform optical response, proves that MBE-grown WSe2 is superior to mechanically exfoliated WSe2 in terms of the convenience of use and reproducibility. The provided results establish significant progress in the optical quality of epitaxially grown transition-metal dichalcogenide monolayers and the fabrication of large-scale functional devices.
{"title":"WSe2 Monolayers Grown by Molecular Beam Epitaxy on hBN","authors":"Julia Kucharek, Mateusz Raczyński, Rafał Bożek, Anna Kaleta, Bogusława Kurowska, Marta Bilska, Sławomir Kret, Takashi Taniguchi, Kenji Watanabe, Piotr Kossacki, Mateusz Goryca, Wojciech Pacuski","doi":"10.1021/acs.nanolett.5c04228","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04228","url":null,"abstract":"A three-step process was developed for growing high-quality, optically uniform WSe<sub>2</sub> monolayers by molecular beam epitaxy (MBE), taking advantage of the use of hexagonal boron nitride (hBN) as a substrate. The process was optimized to maximize the efficiency of photoluminescence and promote the formation of hexagonal WSe<sub>2</sub> domains. Atomic force microscopy was employed to estimate the dispersion of the WSe<sub>2</sub> hexagonal domains' orientation. Monolayer character of the film was identified using optical methods and verified with a high-resolution transmission electron microscopy cross-section. Temperature- and magnetic-field-dependent studies revealed the behavior of exciton complexes to be analogous to that of exfoliated counterparts. Direct growth on hBN, combined with a uniform optical response, proves that MBE-grown WSe<sub>2</sub> is superior to mechanically exfoliated WSe<sub>2</sub> in terms of the convenience of use and reproducibility. The provided results establish significant progress in the optical quality of epitaxially grown transition-metal dichalcogenide monolayers and the fabrication of large-scale functional devices.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"141 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689038","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}
Pub Date : 2025-12-07DOI: 10.1021/acs.nanolett.5c04725
Yu Wu,Ying Chen,Shuming Zeng,Geng Li,Hao Zhang,Liujiang Zhou,Su-Huai Wei,Chenhan Liu
We propose a novel design principle for achieving ultralow thermal conductivity in crystalline materials via a "heavy-light and soft-stiff" structural motif. By combination of heavy and light atomic species with soft and stiff bonding networks, both particle-like (κp) and wave-like (κc) phonon transport channels are concurrently suppressed. First-principles calculations show that this architecture induces a hierarchical phonon spectrum: soft-bonded heavy atoms generate dense low-frequency modes that enhance scattering and reduce κp, while stiff-bonded light atoms produce sparse high-frequency optical branches that disrupt the coherence and lower κc. High-throughput screening identifies Tl4SiS4 (κp = 0.10, κc = 0.06 W/mK) and Tl4GeS4 (κp = 0.09, κc = 0.06 W/mK) as representative candidates with strongly suppressed transport in both channels. A minimal 1D triatomic chain model further demonstrates the generality of this mechanism, offering a new paradigm for phonon engineering beyond the conventional κp-κc trade-off.
{"title":"Pushing the Thermal Conductivity Limit by Decoupling Dual-Channel Phonon Transport in Crystals.","authors":"Yu Wu,Ying Chen,Shuming Zeng,Geng Li,Hao Zhang,Liujiang Zhou,Su-Huai Wei,Chenhan Liu","doi":"10.1021/acs.nanolett.5c04725","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04725","url":null,"abstract":"We propose a novel design principle for achieving ultralow thermal conductivity in crystalline materials via a \"heavy-light and soft-stiff\" structural motif. By combination of heavy and light atomic species with soft and stiff bonding networks, both particle-like (κp) and wave-like (κc) phonon transport channels are concurrently suppressed. First-principles calculations show that this architecture induces a hierarchical phonon spectrum: soft-bonded heavy atoms generate dense low-frequency modes that enhance scattering and reduce κp, while stiff-bonded light atoms produce sparse high-frequency optical branches that disrupt the coherence and lower κc. High-throughput screening identifies Tl4SiS4 (κp = 0.10, κc = 0.06 W/mK) and Tl4GeS4 (κp = 0.09, κc = 0.06 W/mK) as representative candidates with strongly suppressed transport in both channels. A minimal 1D triatomic chain model further demonstrates the generality of this mechanism, offering a new paradigm for phonon engineering beyond the conventional κp-κc trade-off.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"13 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145696684","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}
Pub Date : 2025-12-06DOI: 10.1021/acs.nanolett.5c04794
Li Song,Yaqiang Chen,Wei Li,Yi Liao,Jinyu Zhu,Linjun Cai,Xiao Xia Han
The truncated BID (tBID) protein is crucially important for apoptosis, and recent studies have shown that it can directly trigger cell death. However, the underlying molecular mechanisms are poorly understood. Herein, we present the molecular details of tBID-phospholipid interactions and their correlations with mitochondrial and lysosomal membrane permeabilization during apoptosis. Using Raman spectroscopy, we find that tBID disrupts the conformational order in alkyl chains by selectively binding to phosphatidylethanolamine, cardiolipin (CL), and phosphatidic acid (PA). Our results reveal that tBID undergoes significant conformational changes upon phospholipid binding, generating a redox center that mediates reactive oxygen species (ROS) formation, which, in turn, induces peroxidation of unsaturated phospholipids. These results unveil the key mechanism underlying tBID-induced membrane permeabilization and cytochrome c release from the mitochondria. This study provides novel insights into how tBID mediates apoptosis through crosstalk between mitochondria and lysosomes and paves the way for the development of novel anticancer treatments.
{"title":"Insights into the Molecular Mechanism Underlying tBID-Triggered Cell Death Probed by In Situ Raman Spectroscopy.","authors":"Li Song,Yaqiang Chen,Wei Li,Yi Liao,Jinyu Zhu,Linjun Cai,Xiao Xia Han","doi":"10.1021/acs.nanolett.5c04794","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c04794","url":null,"abstract":"The truncated BID (tBID) protein is crucially important for apoptosis, and recent studies have shown that it can directly trigger cell death. However, the underlying molecular mechanisms are poorly understood. Herein, we present the molecular details of tBID-phospholipid interactions and their correlations with mitochondrial and lysosomal membrane permeabilization during apoptosis. Using Raman spectroscopy, we find that tBID disrupts the conformational order in alkyl chains by selectively binding to phosphatidylethanolamine, cardiolipin (CL), and phosphatidic acid (PA). Our results reveal that tBID undergoes significant conformational changes upon phospholipid binding, generating a redox center that mediates reactive oxygen species (ROS) formation, which, in turn, induces peroxidation of unsaturated phospholipids. These results unveil the key mechanism underlying tBID-induced membrane permeabilization and cytochrome c release from the mitochondria. This study provides novel insights into how tBID mediates apoptosis through crosstalk between mitochondria and lysosomes and paves the way for the development of novel anticancer treatments.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"15 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689024","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}
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