• Beyond the grid: The promise of solar concentration for non-electrical energy generation 

      Apostoleris, Harry; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-09)
      As electricity from both photovoltaics and concentrating solar power has become dramatically more affordable in the last several years, the prospect of converting entire national electrical grids to run almost entirely on renewable energy has become feasible in any location with a strong solar resource. However, focusing only on the electric grid neglects the large portion of our energy usage which ...
    • Comparative net energy analysis of renewable electricity and carbon capture and storage 

      Sgouridis, Sgouris; Carbajales-Dale, Michael; Csala, Denes; Chiesa, Matteo; Bardi, Ugo (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-08)
      Carbon capture and storage (CCS) for fossil-fuel power plants is perceived as a critical technology for climate mitigation. Nevertheless, limited installed capacity to date raises concerns about the ability of CCS to scale sufficiently. Conversely, scalable renewable electricity installations—solar and wind—are already deployed at scale and have demonstrated a rapid expansion potential. Here we show ...
    • Correlation between Wettability and Dissolution of Calcite in Ion-Free Water 

      AlMahri, Mariam; Lu, Jin-You; Chen, Shih-Wen; Olukan, Tuza Adeyemi; Yang, Thomas Chung-Kuang; Alhassan, Saeed; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-13)
      Calcite, a prevalent mineral in the earth’s crust, plays a pivotal role in various geological and industrial processes, including carbon sequestration, water treatment, and enhanced oil recovery. Understanding how wettability (a crucial surface property influenced by the interaction between calcite and surrounding fluids) affects calcite’s dissolution is essential for optimizing these processes. We ...
    • The CPV “toolbox”: New approaches to maximizing solar resource utilization with application-oriented concentrator photovoltaics 

      Apostoleris, Harry; Stefancich, Marco; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-03)
      As the scaling of silicon PV cells and module manufacturing has driven solar energy penetration up and costs down, concentrator photovoltaic technologies, originally conceived as a cost-saving measure, have largely been left behind. The loss of market share by CPV is being locked in even as solar energy development encounters significant obstacles related to space constraints in many parts of ...
    • Detecting and Interpreting Faults in Vulnerable Power Grids With Machine Learning 

      Chiesa, Matteo; Bianchi, Filippo Maria; Eikeland, Odin Foldvik; Holmstrand, Inga Setså; Bakkejord, Sigurd (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-10)
      Unscheduled power disturbances cause severe consequences both for customers and grid operators. To defend against such events, it is necessary to identify the causes of interruptions in the power distribution network. In this work, we focus on the power grid of a Norwegian community in the Arctic that experiences several faults whose sources are unknown. First, we construct a data set consisting ...
    • Detecting and Interpreting Faults in Vulnerable Power Grids with Machine Learning 

      Eikeland, Odin Foldvik; Holmstrand, Inga Setsa; Bakkejord, Sigurd; Chiesa, Matteo; Bianchi, Filippo Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-10)
      Unscheduled power disturbances cause severe consequences both for customers and grid operators. To defend against such events, it is necessary to identify the causes of interruptions in the power distribution network. In this work, we focus on the power grid of a Norwegian community in the Arctic that experiences several faults whose sources are unknown. First, we construct a data set consisting of ...
    • Detecting the linear and non-linear causal links for disturbances in the power grid 

      Foldvik Eikeland, Odin; Bianchi, Filippo Maria; Holmstrand, Inga Setsa; Bakkejord, Sigurd; Chiesa, Matteo (Chapter; Bokkapittel, 2021)
      Unscheduled power disturbances cause severe consequences for customers and grid operators. To avoid suchevents, it is important to identify the causes and localize the sources of the disturbances in the power distribution network. In this work, we focus on a specific power grid in the Arctic region of Northern Norway that experiences an increased frequency of failures of unspecified origin.
    • Direct growth of single-layer terminated vertical graphene array on germanium by plasma enhanced chemical vapor deposition 

      Al-Hagri, Abdulrahman; Li, Ru; Rajput, Nitul S; Lu, Jin-You; Cong, Shan; Sloyan, Karen; Almahri, Mariam Ali; Tamalampudi, Srinivasa Reddy; Chiesa, Matteo; Al Ghaferi, Amal (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-26)
      Vertically aligned graphene nanosheet arrays (VAGNAs) exhibit large surface area, excellent electron transport properties, outstanding mechanical strength, high chemical stability, and enhanced electrochemical activity, which makes them highly promising for application in supercapacitors, batteries, fuel cell catalysts, etc. It is shown that VAGNAs terminated with a high-quality single-layer graphene ...
    • Direct Measurement of the Magnitude of the van der Waals Interaction of Single and Multilayer Graphene 

      Chiou, Yu-Cheng; Olukan, Tuza Adeyemi; Almahri, Mariam Ali; Apostoleris, Harry; Chiu, Cheng Hsiang; Lai, Chia-Yun; Lu, Jin-You; Santos, Sergio; Almansouri, Ibraheem; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-23)
      Vertical stacking of monolayers via van der Waals (vdW) assembly is an emerging field that opens promising routes toward engineering physical properties of two-dimensional materials. Industrial exploitation of these engineering heterostructures as robust functional materials still requires bounding their measured properties so as to enhance theoretical tractability and assist in experimental designs. ...
    • Discerning the Contribution of Morphology and Chemistry in Wettability Studies 

      Sloyan, Karen; Lai, Chia-Yun; Lu, Jin-You; Alfakes, Boulos; Al Hassan, Saeed; Almansouri, Ibraheem; Dahlem, Marcus S; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-15)
      The wetting behavior of homogeneous systems is now well understood at the macroscopic scale. However, this understanding offers little predictive power regarding wettability when mesoscopic chemical and morphological heterogeneities come into play. The fundamental interest in the effect of heterogeneity on wettability is derived from its high technological relevance in several industries, including ...
    • Efficient photoelectrocatalytic degradation of amoxicillin using nano-TiO<inf>2</inf> photoanode thin films: A comparative study with photocatalytic and electrocatalytic methods 

      Alaydaroos, Alia Husain; Sydorenko, Jekaterina; Palanisamy, Selvakumar; Chiesa, Matteo; Al Hajri, Ebrahim (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-24)
      Excessive utilization of antibiotics in human, animal, and aquaculture poses a substantial threat to human health and the environment. Photoelectrochemical processes are increasingly applied for water remediation because they generate oxidizing species and mineralize organic pollutants, making even small water quantities more amenable for utilization. Thus, this study presents the fabrication of an ...
    • Enhanced photoelectrochemical performance of atomic layer deposited Hf-doped ZnO 

      Alfakes, Boulos; Garlisi, Corrado; Villegas, Juan; Al-Hagri, Abdulrahman; Tamalampudi, Srinivasa Reddy; Rajput, Nitul S.; Lu, Jin-You; Lewin, Erik; Sá, Jacinto; Almansouri, Ibraheem; Palmisano, Giovanni; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-08)
      Generation of hydrogen using photoelectrochemical (PEC) water splitting has attracted researchers for the last two decades. Several materials have been utilized as a photoanode in a water splitting cell, including ZnO due to its abundance, low production cost and suitable electronic structure. Most research attempts focused on doping ZnO to tailor its properties for a specific application. In this ...
    • The evolution in graphitic surface wettability with first-principles quantum simulations: the counterintuitive role of water 

      Lu, Jin-You; Lai, Chia-Yun; Almansoori, Ibraheem; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-08)
      The surface wettability of graphite has gained a lot of interest in nanotechnology and fundamental studies alike, but the types of adsorptions that dominate its time resolved surface property variations in ambient environment are still elusive. Prediction of the intrinsic surface wettability of graphite from first-principles simulations offers an opportunity to clarify the overall evolution. In this ...
    • Explaining doping in material research (Hf substitution in ZnO films) by directly quantifying the van der Waals force 

      Lai, Chia-Yun; Santos Hernandez, Sergio; Moser, Toni; Alfakes, Boulos; Lu, Chun-Yu; Olukan, Tuza Adeyemi; Rajput, Nitul; Boström, Tobias; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-04)
      Non-monotonic behavior has been observed in the optoelectronic properties of ZnO thin films as doped with Hf (HZO). Here we propose that two competing mechanisms are responsible for such behaviour. Specifically, we propose that provided two crystal orientations dominate film growth, only one of them might be responsible for direct Hf substitution. Nonmonotonic behaviour is expected at once by ...
    • Gender inequality and self-publication are common among academic editors 

      Liu, Fengyuan; Holme, Petter; Chiesa, Matteo; AlShebli, Bedoor; Rahwan, Talal (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-16)
      Scientific editors shape the content of academic journals and set standards for their fields. Yet, the degree to which the gender makeup of editors reflects that of scientists, and the rate at which editors publish in their own journals, are not entirely understood. Here, we use algorithmic tools to infer the gender of 81,000 editors serving more than 1,000 journals and 15 disciplines over five ...
    • Getting adhesion force maps with an amplitude-modulation AFM in tapping mode 

      Chiesa, Matteo; Santos, Sergio; Lai, Chia-Yun; Olukan, Tuza Adeyemi (Research report; Forskningsrapport, 2020-07)
      Here we demonstrate how to get adhesion force maps with an amplitude-modulation AFM in tapping mode. Our method is tapping mode but it is carried out at ultra-small amplitudes in the presence of surface water layers. The tip is made to vibrated under the water layer in what we call Small Amplitude Small Set-point AM AFM. We show how this is done with an example based on the Cypher scanning probe ...
    • Getting Hamaker coefficients with an amplitude-modulation AFM in tapping mode 

      Lai, Chia-Yun; Olukan, Tuza Adeyemi; Santos, Sergio; Chiesa, Matteo (Research report; Forskningsrapport, 2020-07)
      We demonstrate how to get Hamaker coefficients with an amplitude-modulation AFM operated in standard tapping mode. The Hamaker coefficient is a physical parameter that provides chemical information about the surface of samples. It is based or emerges from van der Waals forces. We use a Cypher scanning probe microscope from Asylum Research to demonstrate the method. The method is based on the research ...
    • High-concentration photovoltaics for dual-use with agriculture 

      Apostoleris, Harry; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-28)
      This study assesses the potential of transparent, tracking-integrated CPV to facilitate more effective dual-use of land for simultaneous agricultural and solar energy production. The concept leverages on the fact that a concentration system is a natural light splitter, separating direct solar radiation from the diffuse. Therefore a transparent CPV module using multijunction solar cells can generate ...
    • Hybrid graphene metasurface for near-infrared absorbers 

      Mahfuzur Rahman, MD; Raza, Aikifa; Younes, Hammad; Alghaferi, Amal; Chiesa, Matteo; Lu, Jin-You (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-19)
      We experimentally demonstrated an amorphous graphene-based metasurface yielding near-infrared super absorber characteristic. The structure is obtained by alternatively combining magnetron-sputtering deposition and graphene transfer coating fabrication techniques. The thickness constraint of the physical vapor–deposited amorphous metallic layer is unlocked and as a result, the as-fabricated graphene-based ...
    • Hydration dynamics and the future of small-amplitude afm imaging in air 

      Santos Hernandez, Sergio; Olukan, Tuza Adeyemi; Lai, Chia-Yun; Chiesa, Matteo (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-23)
      Here, we discuss the effects that the dynamics of the hydration layer and other variables, such as the tip radius, have on the availability of imaging regimes in dynamic AFM—including multifrequency AFM. Since small amplitudes are required for high-resolution imaging, we focus on these cases. It is possible to fully immerse a sharp tip under the hydration layer and image with amplitudes similar to ...