Nanoscale Horizons最新文献

{"title":"Pyrene-based Covalent Organic Frameworks (PyCOFs): A Review","authors":"Hao Yang, Shiqiong Peng, Songhua Chen, Fangyuan Kang, Jun Fan, Huan Zhang, Xianglin Yu, Junbo Li, Qichun Zhang","doi":"10.1039/d4nh00317a","DOIUrl":"https://doi.org/10.1039/d4nh00317a","url":null,"abstract":"Recently, pyrene-based covalent organic frameworks (PyCOFs) have aroused great interesting because the large planar structure of pyrene unit could effectively enhance the interlayer π-π interaction and promote the separation and migration of carriers, significantly improving the crystallinity and photoelectrical properties of PyCOFs. Since the first PyCOF-containing boroxate linkage was reported in 2008 by Yaghi group, many PyCOFs with different kinds of linkages have been reported, exhibiting great potential applications in different fields such as adsorption/separation, chemical sensing, catalysis, and energy storage etc. However, as far as we know, the reviews related to PyCOFs are rare, although PyCOFs have been widely reported to show promising applications. Thus, it is right time and important for us to systematically summarize the research advance in PyCOFs, including the synthesis with different linkages and applications. Moreover, the prospects and obstacles facing the development of PyCOFs are discussed. We hope that this review will provide new insights into PyCOFs that can be explored for more attractive functions or applications.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tunability of exciton delocalization in DNA Holliday junction-templated indodicarbocyanine 5 (Cy5) dye derivative heterodimers","authors":"Gissela Pascual, Sebastián Andrés Díaz, Simon Roy, Adam Meares, Matthew Chiriboga, Kimihiro Susumu, Divita Mathur, Paul D. Cunningham, Igor Medintz, Bernard Yurke, William Knowlton, Joseph Melinger, Jeunghoon Lee","doi":"10.1039/d4nh00225c","DOIUrl":"https://doi.org/10.1039/d4nh00225c","url":null,"abstract":"We studied the exciton delocalization of indodicarbocyanine 5 dye derivative (Cy5-R) heterodimers templated by DNA Holliday junction (HJ), which was quantified by the exciton hopping parameter <em>J<small>_m,n</small></em>. These dyes were modified at the 5 and 5‘ positions of indole rings with substituents (R) H, Cl, tBu, Peg, and hexyloxy (Hex) groups that exhibit different bulkiness and electron-withdrawing/donating capacities. The substituents tune the physical properties of the dyes, such as hydrophobicity (Log P) and solvent-accessible surface area (SASA). We tuned <em>J<small>_m,n</small></em> of heterodimers by attaching two Cy5-Rs in adjacent and transverse positions along the DNA-HJ. Adjacent heterodimers exhibited smaller <em>J<small>_m,n</small></em> compared to transverse heterodimers, and some adjacent heterodimers displayed a mixture of H- and J-like aggregates. Most heterodimers exhibited <em>J<small>_m,n</small></em> values within the ranges of the corresponding homodimers, but some heterodimers displayed synergistic exciton delocalization that resulted in larger <em>J<small>_m,n</small></em> compared to their homodimers. We then investigated how chemically distinct Cy5-R conjugated to DNA can interact to create delocalized excitons. We determined that heterodimers involving Cy5-H and Cy5-Cl and a second dye with larger substituents (bulky substituents and large SASA) such as Cy5-Peg, Cy5-Hex, and Cy5-tBu resulted in the larger <em>J<small>_m,n</small></em>. The combination provides steric hindrance that optimizes co-facial packing (bulky Cy5-R) with a smaller footprint (small SASA) that maximizes proximity. The results of this study lay a groundwork for rationally optimizing the exciton delocalization in dye aggregates for developing next-generation technologies based on optimized exciton transfer efficiency such as quantum information systems and biomedicine.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Explicating conjugated polymer extraction used for the differentiation of single-walled carbon nanotubes","authors":"Dominik Just, Tomasz Wasiak, Andrzej Dzienia, Karolina Z. Milowska, Anna Mielańczyk, Dawid Janas","doi":"10.1039/d4nh00427b","DOIUrl":"https://doi.org/10.1039/d4nh00427b","url":null,"abstract":"Single-walled carbon nanotubes (SWCNTs) are synthesized as mixtures of various SWCNT types, exhibiting drastically different properties, and thereby making the material of limited use. Fluorene-based polymers are successful agents for purifying such blends by means of conjugated polymer extraction (CPE), greatly increasing their application potential. However, a limited number of studies have devoted attention to understanding the effects of the polyfluorene backbone and side chain structure on the selectivity and separation efficiency of SWCNTs. Regarding the impact of the polymer backbone, it was noted that the ability to extract SWCNTs with conjugated polymers could be significantly enhanced by using fluorene-based copolymers that exhibit dramatically different interactions with SWCNTs depending on the types of monomers combined. However, the role of monomer side chains remains much less explored, and the knowledge generated so far is fragmentary. Herein, we present a new approach to tailor polymer selectivity by creating copolymers of polyfluorene bearing mixed-length alkyl chains. Their thorough and systematic analysis by experiments and modeling revealed considerable insight into the impact of the attached functional groups on the capacity of conjugated polymers for the purification of SWCNTs. Interestingly, the obtained results contradict the generally accepted conclusion that polyfluorene-based polymers and copolymers with longer chains always prefer SWCNTs of larger diameters. Besides that, we report that the capacity of such polymers for sorting SWCNTs may be considerably enhanced using specific low molecular weight compounds. The carried-out research provides considerable insight into the behavior of polymers and carbon-based materials at the nanoscale.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intravital microscopic thermometry of rat mammary epithelium by fluorescent nanodiamond","authors":"Takahiro Hamoya, Kiichi Kaminaga, Ryuji Igarashi, Yukiko Nishimura, Hiromi Yanagihara, Takamitsu Morioka, Chihiro Suzuki, Hiroshi Abe, Takeshi Ohshima, Tatsuhiko Imaoka","doi":"10.1039/d4nh00237g","DOIUrl":"https://doi.org/10.1039/d4nh00237g","url":null,"abstract":"Quantum sensing using the fluorescent nanodiamond (FND) nitrogen-vacancy center enables physical/chemical measurements of the microenvironment, although application of such measurements in living mammals poses significant challenges due to the unknown biodistribution and toxicity of FNDs, the limited penetration of visible light for quantum state manipulation/measurement, and interference from physiological motion. Here, we describe a microenvironmental thermometry technique using FNDs in rat mammary epithelium, an important model for mammary gland biology and breast cancer research. FNDs were injected directly into the mammary gland. Microscopic observation of mammary tissue sections showed that most FNDs remained in the mammary epithelium for at least 8 weeks. Pathological examination indicated no obvious change in tissue morphology, suggesting negligible toxicity. Optical excitation and detection were performed through a skin incision. Periodic movements due to respiration and heartbeat were mitigated by frequency filtering of the signal. Based on these methods, we successfully detected temperature elevation in the mammary epithelium associated with lipopolysaccharide-induced inflammation, demonstrating the sensitivity and relevance of the technique in biological contexts. This study lays the groundwork for expanding the applicability of quantum sensing in biomedical research, providing a tool for real-time monitoring of physiological and pathological processes.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In situ Studies Revealing the Effect of Au Surfactant on the Formation of Ultra-Thin Ag Layers Using High-power Impulse Magnetron Sputter Deposition","authors":"Suzhe Liang, Tianfu Guan, Shanshan Yin, Suo Tu, Renjun Guo, Yusuf Bulut, Kristian Amand Reck, Jonas Drewes, Wei Chen, Thomas Strunskus, Matthias Schwartzkopf, Franz Faupel, Stephan Volkher Roth, Yajun Cheng, Peter Müller-Buschbaum","doi":"10.1039/d4nh00159a","DOIUrl":"https://doi.org/10.1039/d4nh00159a","url":null,"abstract":"Introducing metallic nanoparticles, such as Au, on the substrate as a surfactant or wetting inducer has been demonstrated as a simple but effective way to facilitate the formation of ultra-thin silver layers (UTSLs) during the following Ag deposition. However, most research paid much attention to the applications of UTSLs assisted by metallic surfactants but neglected the underlying mechanisms of how the metallic surfactant affects the formation of UTSL. Here, we apply in situ grazing-incidence wide-/small-angle X-ray scattering to reveal the effects of the Au surfactant or seed layer (pre-deposited Au nanoparticles) on the formation of UTSL by high-power impulse magnetron sputter deposition (HiPIMS) on a zinc oxide (ZnO) thin film. According to the comprehensive and in-depth analysis of the in situ X-ray scattering data, we observe that the pre-deposited Au nanoparticles can act as additional defects or growth cores for the sputtered Ag atoms despite using HiPIMS, which itself already forms many nucleation sites. As a result, the formation of a continuous and smooth UTSL is reached earlier in HiPIMS as compared with bare ZnO thin films. Based on the mechanism revealed by the in situ measurements, we provide insight into the formation of UTSL and further UTSL-based applications.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polytypic Quantum Wells in Si and Ge: Impact of 2D Hexagonal Inclusions on Electronic Band Structure","authors":"Anna Marzegalli, Francesco Montalenti, Emilio Scalise","doi":"10.1039/d4nh00355a","DOIUrl":"https://doi.org/10.1039/d4nh00355a","url":null,"abstract":"Crystal defects, traditionally viewed as detrimental, are now being explored for quantum technology applications. This study focuses on stacking faults in silicon and germanium, forming hexagonal inclusions within the cubic crystal and creating quantum wells that modify electronic properties. By modeling defective structures with varying hexagonal layer counts, we calculated formation energies and electronic band structures. Our results show that hexagonal inclusions in Si and Ge exhibit a direct band gap, changing with inclusion thickness, effectively functioning as quantum wells. We find that Ge inclusions have a direct band gap and form Type-I quantum wells. This research highlights the potential of manipulating extended defects to engineer the optoelectronic properties of Si and Ge, offering new pathways for advanced electronic and photonic device applications.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Durable silver nanowire transparent electrodes enabled by biorenewable nanocoating using chitin and cellulose nanofibers for flexible electronics","authors":"Yoo-Bin Kwon, Seongwon Cho, Dal-Hee Min, Young-Kwan Kim","doi":"10.1039/d4nh00285g","DOIUrl":"https://doi.org/10.1039/d4nh00285g","url":null,"abstract":"The protection of silver nanowire (AgNW) networks is crucial for enhancing their durability and applicability to flexible electronics. In this study, we present a sustainable and efficient strategy to protect AgNW-based flexible transparent electrodes (FTEs) using a layer-by-layer (LBL) assembly of biorenewable chitin and cellulose nanofibers (Chi and Cell). These uniform LBL-assembled thin films were successfully fabricated on AgNW FTEs due to their opposite surface charges. The resulting (Chi/Cell)<small>_<em>n</em></small> bilayers, where <em>n</em> is the number of bilayers, did not degrade the optoelectrical properties of AgNW FTEs and significantly enhanced their stability under various harsh conditions. The optimized (Chi/Cell)<small>₁₀</small>@Al-AgNW FTEs exhibited comprehensive stability against UV/O<small>₃</small> treatment for 40 min, thermal treatment at 250 °C for 350 min, Na<small>₂</small>S (1%), HCl (10%), and NH<small>₃</small> (30%) treatments for 3, 30, and 105 min, respectively, sonication for 300 min, and 10 000 cycles of bending test. Therefore, the (Chi/Cell)<small>₁₀</small>@Al-AgNW FTEs were successfully applied to transparent heaters (TH) and pressure sensors with remarkably improved applicability, durability, and performance compared to pristine AgNW FTEs, providing a reassuring solution to the stability issues of AgNW-based FTEs.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: New horizons on advanced nanoscale materials for Cultural Heritage conservation","authors":"Rosangela Mastrangelo, David Chelazzi, Piero Baglioni","doi":"10.1039/d4nh90062f","DOIUrl":"https://doi.org/10.1039/d4nh90062f","url":null,"abstract":"Correction for ‘New horizons on advanced nanoscale materials for Cultural Heritage conservation’ by Rosangela Mastrangelo <em>et al.</em>, <em>Nanoscale Horiz.</em>, 2024, <strong>9</strong>, 566–579, https://doi.org/10.1039/D3NH00383C.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-resistivity Ohmic contacts of Ti/Al on few-layered 1T’-MoTe2/2H-MoTe2 heterojunction grown by chemical vapor deposition","authors":"Ping Fing Chi, Jing-Jie Wang, Jing-Wen Zhang, Yung-Lan Chuang, Ming-Lun Lee, Jinn-Kong Sheu","doi":"10.1039/d4nh00347k","DOIUrl":"https://doi.org/10.1039/d4nh00347k","url":null,"abstract":"This study explores the phase-controlled growth of few-layered 2H-MoTe<small>₂</small>, 1T’-MoTe<small>₂</small>, and 2H-/1T’-MoTe<small>₂</small> heterostructures and their impacts on metal contact properties. Cold-wall chemical vapor deposition (CW-CVD) with varying growth rates of MoOx and reaction temperatures with Te vapors enabled the growth of continuous thin films of either 1T’-MoTe2 or 2H-MoTe2 phases on two-inch sapphire substrates. This methodology facilitates the meticulous optimization of chemical vapor deposition (CVD) parameters, enabling the realization of phase-controlled growth of few-layered MoTe2 thin films and their subsequent heterostructures. The study further investigates the influence of a 1T’-MoTe<small>₂</small> intermediate layer on the electrical properties of metal contacts on few-layered 2H-MoTe<small>₂</small>. Bi-layer Ti/Al contacts directly deposited on 2H-MoTe<small>₂</small> exhibited a Schottky behavior, indicating inefficient carrier transport. However, introducing a few-layered 1T’-MoTe2 intermediate layer between the metal and 2H-MoTe2 layers improved the contact characteristics significantly. The resulting Al/Ti/1T’-MoTe<small>₂</small>/2H-MoTe<small>₂</small> contact scheme demonstrates Ohmic behavior with a specific contact resistance of around 1.7x10<small>^-4</small> Ω-cm<small>²</small>. This substantial improvement is attributed to the high carrier concentration of the 1T’-MoTe<small>₂</small> intermediate layer, facilitating increased tunneling events across the van der Waals gap and enhancing carrier transport between the metal and 2H-MoTe<small>₂</small>.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A universal synthetic method for preparing nanoassemblies of quantum dots and organic molecules","authors":"Chao Wang","doi":"10.1039/d4nh90063d","DOIUrl":"https://doi.org/10.1039/d4nh90063d","url":null,"abstract":"This article highlights the recent work of Biju, Takano <em>et al.</em> (<em>Nanoscale Horiz.</em>, 2024, <strong>9</strong>, 1128–1136, https://doi.org/10.1039/D4NH00134F) on using a unique bio-catalytic nanoparticle shaping method for preparing mesoscopic particles.","PeriodicalId":93,"journal":{"name":"Nanoscale Horizons","volume":null,"pages":null},"PeriodicalIF":9.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}