Nano Futures最新文献

{"title":"Bandgap optimization of sol–gel-derived TiO2 and its effect on the photodegradation of formic acid","authors":"M. Zouheir, O. Assila, K. Tanji, A. El Gaidoumi, J. Araña, J. M. Doña Rodríguez, J. Smått, T. Huynh, A. Kherbeche","doi":"10.1088/2399-1984/abfb7d","DOIUrl":"https://doi.org/10.1088/2399-1984/abfb7d","url":null,"abstract":"This work reports a key factor, the H2SO4 concentration, in controlling the physicochemical properties of titanium dioxide (TiO2) photocatalysts during the sol–gel synthesis. The photocatalysts synthesized using different concentrations of H2SO4 possess specific anatase/rutile ratios and crystallite sizes as well as surface areas, resulting in different photocatalytic performance in the degradation of formic acid in solution. The best photocatalytic performance is observed for the TiO2 photocatalyst containing a relatively high percentage of the rutile phase (∼84%), which is obtained from the sol–gel synthesis without H2SO4.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45865028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geometric effects on carrier collection in core–shell nanowire p–n junctions","authors":"Mingze Yang, A. Darbandi, S. Watkins, K. Kavanagh","doi":"10.1088/2399-1984/ac094c","DOIUrl":"https://doi.org/10.1088/2399-1984/ac094c","url":null,"abstract":"We report electron-beam-induced current (EBIC) microscopy carried out on free-standing GaAs nanowire core–shell, p–n tunnel junctions. The carrier kinetics in both the n-type core and the p-type shell were determined by analyzing radial EBIC profiles as a function of beam energy. These profiles are highly sensitive to geometric effects such as facet width, shell and core thicknesses, and depletion widths. Combined with Monte Carlo simulations, they permitted measurement of the minority carrier diffusion lengths in the core and the shell, as well as the depletion widths as a function of radial direction. The relatively short minority carrier diffusion length in the core (50 nm), can be attributed to bulk point defects originating from low-temperature core growth (400 ∘C), or to interfacial recombination at traps at the p–n junction.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43239491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multilayer adsorption and kinetic studies of dyes on pure and structurally modified poly(methyl methacrylate) electrospun nanofibers","authors":"P. Philip, Tomlal Jose, J. T. Mathew, Jinesh M. Kuthanapillil","doi":"10.1088/2399-1984/abf6b2","DOIUrl":"https://doi.org/10.1088/2399-1984/abf6b2","url":null,"abstract":"Natural fibers and materials are well known for adsorption studies, whereas synthetic fibers have not received enough attention in this field. Therefore, an attempt is made here to study the adsorption properties of synthetic poly(methyl methacrylate) (PMMA) nanofibers and methods for improving or modifying their adsorption properties. PMMA nanofibers are prepared by the most recent electrospinning technique and the structural, and hence, the adsorption properties of the PMMA nanofibers are modified by preparing them in surface-roughened and coaxial hollow forms through electrospinning. Studies of the adsorption of methylene blue (MB) and brilliant green (BG) dyes by the three types of PMMA nanofiber demonstrate that all the PMMA nanofibers show a certain amount of adsorption. Fiber samples that had adsorbed MB and BG were subjected to various adsorption isotherms which confirmed the multilayer adsorption properties of the fiber samples by satisfying various isotherms, mainly the Freundlich and Elovich adsorption isotherms. Kinetic studies of pure and structurally modified PMMA nanofibers that had adsorbed MB and BG dyes proved that the intraparticle diffusion model applied to these fiber samples. Here, it is also shown that the adsorption properties of electrospun synthetic fibers can be further improved by structural modification using the possibilities of electrospinning.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42445374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ambipolar carbon nanotube transistors with hybrid nanodielectric for low-voltage CMOS-like electronics","authors":"Luis Portilla, Jianwen Zhao, Jing Zhao, L. Occhipinti, V. Pecunia","doi":"10.1088/2399-1984/abf6b1","DOIUrl":"https://doi.org/10.1088/2399-1984/abf6b1","url":null,"abstract":"The proliferation of place-and-forget devices driven by the exponentially-growing Internet of Things industry has created a demand for low-voltage thin-film transistor (TFT) electronics based on solution-processible semiconductors. Amongst solution-processible technologies, TFTs based on semiconducting single-walled carbon nanotubes (sc-SWCNTs) are a promising candidate owing to their comparatively high current driving capability in their above-threshold region at low voltages, which is desirable for applications with constraints on supply voltage and switching speed. Low-voltage above-threshold operation in sc-SWCNTs is customarily achieved by using high-capacitance-density gate dielectrics such as metal-oxides fabricated via atomic layer deposition (ALD) and ion-gels. These are unattractive, as ALD requires complex-processing or exotic precursors, while ion-gels lead to slower devices with poor stability. This work demonstrates the fabrication of low-voltage above-threshold sc-SWCNTs TFTs based on a high-capacitance-density hybrid nanodielectric, which is composed of a readily-made AlO x nanolayer and a solution-processed self-assembled monolayer (SAM). The resultant TFTs can withstand a gate-channel voltage of 1–2 V, which ensures their above-threshold operation with balanced ambipolar behavior and electron/hole mobilities of 7 cm2 V−1 s−1. Key to achieving balanced ambipolarity is the mitigation of environmental factors via the encapsulation of the devices with an optimized spin-on polymer coating, which preserves the inherent properties of the sc-SWCNTs. Such balanced ambipolarity enables the direct implementation of CMOS-like circuit configurations without the use of additional dopants, semiconductors or source/drain electrode metals. The resultant CMOS-like inverters operate in the above-threshold region with supply voltages in the 1–2 V range, and have positive noise margins, gain values surpassing 80 V/V, and a bandwidth exceeding 100 kHz. This reinforces SAM-based nanodielectrics as an attractive route to easy-to-fabricate sc-SWCNT TFTs that can operate in the above-threshold region and that can meet the demand for low-voltage TFT electronics requiring moderate speeds and higher driving currents for wearables and sensing applications.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46152074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and water flow velocity measurement of a large diameter single-wall carbon nanotube","authors":"Aoran Fan, Yu-dong Hu, Yufeng Zhang, Weigang Ma, Xing Zhang","doi":"10.1088/2399-1984/abe0cb","DOIUrl":"https://doi.org/10.1088/2399-1984/abe0cb","url":null,"abstract":"To fill the gap in the measurement of large diameter single-wall carbon nanotube (SWCNT) and further predict the variation rule of mass flux versus diameter, this work measured the water flow velocity and mass flux coefficient in an individual SWCNT with a 3.07 nm diameter. A mechanical method is used to obtain the large diameter SWCNT by removing the internal tube of a double-wall carbon nanotube, and then the water flow velocity through this SWCNT was measured by an electrical method. The water flow velocity of large diameter SWCNT can reach to 146.1 ± 32.5 μm s−1, and the enhancement factor compared with no-slip Hagen–Poiseuille relation is about 14.5. A mass flux coefficient is defined to describe the mass flow ability through SWCNT and calculated by the experiment data. Although the enhancement factor decreased to ∼1/4 of the normal size SWCNT (∼1.5 nm), the mass flux coefficient in the large diameter SWCNT increased efficiently, and which is about 5.7 times to the normal size SWCNT. Based on the above measurement result, a reported simulation result can be revised and then verified to describe the enhancement factor versus diameter, and the mass flux coefficient of the SWCNT can be further predicted. According to the prediction result, in the bulk-like liquid region, the mass flux of an individual SWCNT can reach to maximum when the diameter is around 2.9 nm, which would provide a new idea for the design of the SWCNT-based nanodevices in the future.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49488874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Overcoming roadblocks in computational roadmaps to the future for safe nanotechnology","authors":"C. Ö. Karakus, D. Winkler","doi":"10.1088/2399-1984/abe560","DOIUrl":"https://doi.org/10.1088/2399-1984/abe560","url":null,"abstract":"The rapid rise of nanotechnology has resulted in a parallel rise in the number of products containing nanomaterials. The unusual properties that nano forms of materials exhibit relative to the bulk has driven intense research interest and relatively rapid adoption by industry. Regulatory agencies are charged with protecting workers, the public, and the environment from any adverse effects of nanomaterials that may also arise because of these novel physical and chemical properties. They need data and models that allow them to flag nanomaterials that may be of concern, while balancing potential stifling of commercial innovation. Roadmaps for the future of safe nanotechnology were defined more than a decade ago, but many roadblocks identified in these studies remain. Here, we discuss the roadblocks that are still hindering the effective application of informatics and predictive computational nanotoxicology methods from providing more effective guidance to nanomaterials regulatory agencies and safe-by-design rationale for industry. We describe how developments in high throughput synthesis, characterization, and biological assessment of nanomaterials will overcome many of these roadblocks, allowing a clearly defined roadmap for computational design of effective but safe-by-design nanomaterials to be realized.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48750730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Futures Honed","authors":"B. Adam","doi":"10.1093/oxfordhb/9780198806820.013.7","DOIUrl":"https://doi.org/10.1093/oxfordhb/9780198806820.013.7","url":null,"abstract":"This chapter comprises an interview between Barbara Adam and the editors, and is followed by Adam’s ‘Honing Futures’, which is presented in four short verses of distilled theory. In the interview Adam reflects on thirty-five years of futures-thinking rooted in her deeply original work on time and temporality, and her innovative response to qualitative and linear definitions of time within the social sciences. The interview continues with a discussion of the way Adam’s thinking on futures intersects in her work with ideas of ethics and collective responsibility politics and concludes with a brief rationale for writing theory in verse form. In ‘Honing Futures’, a piece of futures theory verse form, Adam charts the movements and moments in considerations of the Not Yet and futurity’s active creation: from pluralized imaginings of the future, to an increasingly tangible and narrower anticipated future, to future-making as designing and reality-creating performance. Collectively, the verses identify the varied complex interdependencies of time, space, and matter with the past and future in all iterations of honing and making futures.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":"297 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77418702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From Boundless Expansion to Existential Threat","authors":"Apolline Taillandier","doi":"10.1093/oxfordhb/9780198806820.013.20","DOIUrl":"https://doi.org/10.1093/oxfordhb/9780198806820.013.20","url":null,"abstract":"This essay examines visions of the future of human life in transhumanist imaginaries of the posthuman, ranging from utopian figurations to catastrophist warnings. Focusing on libertarian, liberal, and conservative posthuman imaginaries, it argues that the posthuman condition is defined by changing scientific, moral, and political narratives, including ideas of revolutionary change, progressive evolution through the ethical use of human enhancement technologies, and the mitigation of existential risk for the preservation of intelligence and civilization in the long term. Changing posthuman imaginaries, it shows, reshape spaces of present and future political imagination.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":"98 3 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75583435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wakanda Phambili!","authors":"Laura M. Pereira, Charne Lavery, B. Moyo, O. Selomane, N. Sitas, Rike Sitas, C. Trisos","doi":"10.1093/oxfordhb/9780198806820.013.16","DOIUrl":"https://doi.org/10.1093/oxfordhb/9780198806820.013.16","url":null,"abstract":"This chapter develops and articulates an African futurist approach to framing and meeting the challenges of social-ecological futures. It advocates a broader conception of futures as lived practice embedded within specific places (e.g. Africa) and their histories, and explores how such practice can form an alternative model to current (Western) climate and environmental scenarios. It proposes that narratives from non-Western cultures offer more nuanced and diverse approaches to decision-making under conditions of uncertainty than the archetypical scenarios depicted in current models. This chapter uses science fiction from sub-Saharan Africa as a source for more experiential decision-making that emphasizes a decolonial agenda, which could shape and change the way we use quantitative modelling to consider future trajectories for the planet in the age of the Anthropocene.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":"505 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76510471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Birth of Nuclear Eternity","authors":"Benoît Pelopidas","doi":"10.1093/oxfordhb/9780198806820.013.28","DOIUrl":"https://doi.org/10.1093/oxfordhb/9780198806820.013.28","url":null,"abstract":"This chapter reconnects modes of futures-making with the requirements of democracy by focusing on the naturalization of nuclear weapons and their removal from the realm of democratic choice at a particular point in time. The chapter revolves around the concept of ‘nuclear eternity’ as a means of reducing public choices about the use of nuclear weapons. It critiques the idea that nuclear weapons have always been perceived as ‘here to stay’ and reassesses the dominant narrative about the 1960s as an emancipatory decade by arguing that the decade actually witnessed a significant shrinking of future political possibilities. Finally, the chapter identifies three shapes of the future which produce ‘nuclear eternity’—an absent post-nuclear future, an inconsistent post-nuclear future, and a disconnected post-nuclear future—and illustrates them with historical examples","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":"19 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91165766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}