Article
Energy & Fuels
Christof Schultz, Markus Fenske, Laura-Isabelle Dion-Bertrand, Guillaume Gelinas, Stephane Marcet, Janardan Dagar, Andreas Bartelt, Rutger Schlatmann, Eva Unger, Bert Stegemann
Summary: Absolute calibrated hyperspectral photoluminescence (PL) imaging is used to spatially map relevant solar cell parameters without electrical measurements. The process of laser patterning for monolithic series interconnection is evaluated, and it is found that both picosecond and nanosecond laser pulses can be used successfully. Hyperspectral PL imaging provides insights into the material removal process and the resilience of perovskite against the thermal impact of the laser.
Article
Engineering, Electrical & Electronic
Shruti Hegde, Hammad Malik, Krista Carlson, Swomitra K. Mohanty, Kerry E. Kelly
Summary: This paper presents the development of a titania nanotube-based sensor array for cost-effectively detecting benzene, a human carcinogen, at occupationally and atmospherically relevant concentrations. The sensor has a high surface area, is highly sensitive, and operates at room temperature using simple, portable instrumentation. The sensing mechanism is explained based on Fermi level changes caused by band bending for this benzene sensor.
IEEE SENSORS JOURNAL
(2021)
Article
Physics, Multidisciplinary
Yong Li, Peng-Fei Ji, Ya-Juan Hao, Yue-Li Song, Feng-Qun Zhou, Shu-Qing Yuan
Summary: The article discusses the fabrication of CdS nanowire array using the solvothermal method, and analyzes the temperature-dependent photoluminescence results, showing the emission peaks related to different transitions and phonon replicas.
Article
Nanoscience & Nanotechnology
Nutpaphat Jarulertwathana, Syazwani Mohd-Noor, Jerome K. Hyun
Summary: The study demonstrated the use of titania microspheres as optical humidity sensors, achieving high-performance, ultrafast, and stable touchless control, with sensor performance influenced by the microstructural characteristics of the microspheres. By optimizing the microstructural properties of the microspheres, high-sensitivity response to humidity was achieved, including wavelength shifts above 100 nm, near full-scale relative humidity (RH) responsivity, ultra-short response times below 30 ms, and prolonged lifetimes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Feng Ke, Chuanjun Zhou, Mengke Zheng, Hao Li, Junjie Bao, Chen Zhu, Yongbo Song, Wen Wu Xu, Manzhou Zhu
Summary: The synthesis and properties of a novel alloyed Ag-Cu nanowire were described in this study, showing good conductivity and resistivity consistent with that of a semiconductor. This alloyed nanowire has potential applications in electronic devices due to its excellent thermal stability and high-yielding gram-scale synthesis.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Sudip Kumar Pal, Dorothy Bardhan, Debarun Sen, Hirak Chatterjee, Sujit Kumar Ghosh
Summary: The dimeric configurations of gold nanorods have been chosen to study the correlation between optoelectronic and mechanical properties. The optoelectronic characteristics of gold nanorod homodimers at different angles have been elucidated through both theoretical and experimental approaches. The design of an optoelectronic landscape has been achieved by correlating plasmonics and photocapacitance through the optical torque of gold nanorod dimers.
NANOSCALE ADVANCES
(2023)
Article
Optics
S. M. El-Broullesy, R. El-Bashar, M. R. I. Ramadan, S. Aboul-Enein, A. Ibrahim, D. H. Wood, Mohamed Farhat O. Hameed, S. S. A. Obayya
Summary: In this paper, modified conical nanowires (CNWs) with different top diameters are proposed to enhance light absorption. By optimizing the top cone diameters, the Mie resonances are improved and strengthened over a wide range of wavelengths. The reported design shows significant improvement in efficiency and current density compared to the conventional CNWs.
Article
Chemistry, Physical
David A. Brewster, Melissa D. Koch, Kathryn E. Knowles
Summary: This paper describes the analysis of dropcast nanocrystalline and electrochemically deposited films of NiO and alpha-Fe2O3 as model metal oxide semiconductors immersed in redox-inactive organic electrolyte solutions using EIS. The interpretation of physical meaning of circuit elements differs from EIS measurements of metal oxide electrodes immersed in redox-active media. Understanding the distinction between film morphology and intrinsic electronic structure of the metal oxide is crucial for evaluating nanostructured metal oxide electrodes for electrochemical energy storage and electrocatalysis applications.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Myung Sik Choi, Han Gil Na, Sun-Woo Choi, Kyu Hyoung Lee, Changhyun Jin
Summary: SnO2 and Au were deposited using flame chemical vapor deposition (FCVD) to form a double layer. A compound of Sn and O with multiple band gaps was formed in a short time, with Sn moving to the Au side and leaving O behind. Sn's capillarity allowed it to form a unique structure with Au-Sn-O nanoparticles and amorphous Sn-O nanotubes.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Asha Yadav, Bo Fu, Stephanie Nicole Bonvicini, Linh Quy Ly, Zhitai Jia, Yujun Shi
Summary: beta-Ga2O3 nanostructures with different morphologies, including nanowires, nanosheets, and nanorods, were successfully synthesized using thermally dewetted Au nanoparticles as catalysts. The growth of the nanostructures was found to be governed by different mechanisms, with the vapor-liquid-solid mechanism governing nanowire growth and the vapor-solid mechanism occurring in the growth of nanosheets and nanorods. The as-grown beta-Ga2O3 nanostructures exhibited high purity, wide bandgap, and strong photoluminescence emission, making them promising for applications in optoelectronic devices such as tunable UV-Vis photodetectors.
Article
Physics, Applied
Nizar Chaouachi, Sihem Jaziri
Summary: We develop a theoretical study to evaluate the dynamic photoemission spectrum of exciton steady-states in monolayer transition metal dichlacogenides. The effect of dielectric environment on exciton binding energies is discussed. Coherent coupling between 1s and 2s excitons and quantum beat phenomena are observed.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Yun Xiao, Haibin Wang, Fumiyasu Awai, Naoyuki Shibayama, Takaya Kubo, Hiroshi Segawa
Summary: This study fabricated eco-friendly solar cells using interdigitated layers consisting of ZnO nanowires and infrared absorbing AgBiS2 nanocrystals. The quality of ZnO nanowires and its defects affecting solar cell performance were investigated. Oxygen vacancies and Zn interstitial sites were identified as the main recombination sites, hindering carrier collection in the solar cells. By reducing the concentration of these defects, the structural order and electron-phonon interaction in ZnO nanowires were improved. Furthermore, the study emphasized the significance of reducing defects in ZnO for improving not only colloidal quantum dot solar cells but also other emerging solar cell technologies.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Yun Xiao, Haibin Wang, Fumiyasu Awai, Naoyuki Shibayama, Takaya Kubo, Hiroshi Segawa
Summary: Oxygen vacancies and zinc interstitial sites are the main factors affecting the performance of solar cells, hindering carrier collection in the cells.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Junke Jiang, Feng Liu, Qing Shen, Shuxia Tao
Summary: The introduction of sodium enhances the photoluminescence quantum yield of CsSn0.6Pb0.4I3 quantum dots, but the enhanced effect diminishes over time, resulting in a relatively short lifetime of high PLQYs. Engineering the surface termination of the quantum dots may be the next step in maintaining the favorable effect of Na doping for a high and stable PLQY of Sn-Pb QDs.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Inorganic & Nuclear
Ramachandrapanicker Devi Chandra, Lalan Veena, Kunnel Gopalan Gopchandran
Summary: Cobalt (Co)-doped ZnO nanoparticles were synthesized at 100°C using a simple chemical technique, resulting in nanoparticles with high crystallinity and reduced defect density. Co-doping suppressed oxygen-vacancy-related defects at lower doping densities, but increased defect density at higher doping densities. Co-doping was found to significantly suppress defects in ZnO for electronic and optoelectronic applications, as demonstrated by XPS, PL, electrical conductivity, and Mott-Schottky analysis. Photodetectors fabricated with Co-doped ZnO nanoparticles showed faster response time due to the reduced defect density.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Piyush Kar, Sheng Zeng, Yun Zhang, Ehsan Vahidzadeh, Ajay Manuel, Ryan Kisslinger, Kazi M. Alam, Ujwal K. Thakur, Najia Mahdi, Pawan Kumar, Karthik Shankar
APPLIED CATALYSIS B-ENVIRONMENTAL
(2019)
Article
Engineering, Electrical & Electronic
Kazi M. Alam, Piyush Kar, Ujwal K. Thakur, Ryan Kisslinger, Najia Mahdi, Arash Mohammadpour, Payal A. Baheti, Pawan Kumar, Karthik Shankar
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2019)
Article
Nanoscience & Nanotechnology
Ryan Kisslinger, Abdelrahman M. Askar, Ujwal K. Thakur, Saralyn Riddell, Darren Dahunsi, Yun Zhang, Sheng Zeng, Ankur Goswami, Karthik Shankar
Article
Chemistry, Multidisciplinary
Claudia Ott, Felix Reiter, Maximilian Baumgartner, Markus Pielmeier, Anna Vogel, Patrick Walke, Stefan Burger, Michael Ehrenreich, Gregor Kieslich, Dominik Daisenberger, Jeff Armstrong, Ujwal Kumar Thakur, Pawan Kumar, Shunda Chen, Davide Donadio, Lisa S. Walter, R. Thomas Weitz, Karthik Shankar, Tom Nilges
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Chemistry, Physical
Ujwal K. Thakur, Sheng Zeng, Pawan Kumar, Sahil Patel, Ryan Kisslinger, Yun Zhang, Piyush Kar, Ankur Goswami, Thomas Thundat, Alkiviathes Meldrum, Karthik Shankar
JOURNAL OF POWER SOURCES
(2019)
Article
Chemistry, Multidisciplinary
Pawan Kumar, Ehsan Vahidzadeh, Wal K. Thakur, Piyush Kar, Kazi M. Alam, Ankur Goswami, Najia Mandi, Kai Cui, Guy M. Bernard, Vladimir K. Michaelis, Karthik Shankar
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Physical
Lian C. T. Shoute, Weidi Hua, Ryan Kisslinger, Ujwal K. Thakur, Sheng Zeng, Ankur Goswami, Pawan Kumar, Piyush Kar, Karthik Shankar
APPLIED SURFACE SCIENCE
(2019)
Article
Engineering, Electrical & Electronic
Ryan Kisslinger, Saralyn Riddell, Spencer Savela, Piyush Kar, Ujwal K. Thakur, Sheng Zeng, Karthik Shankar
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2019)
Article
Materials Science, Multidisciplinary
Pawan Kumar, Piyush Kar, Ajay P. Manuel, Sheng Zeng, Ujwal K. Thakur, Kazi M. Alam, Yun Zhang, Ryan Kisslinger, Kai Cui, Guy M. Bernard, Vladimir K. Michaelis, Karthik Shankar
ADVANCED OPTICAL MATERIALS
(2020)
Article
Chemistry, Physical
Sheng Zeng, Ehsan Vahidzadeh, Collin G. VanEssen, Piyush Kar, Ryan Kisslinger, Ankur Goswami, Yun Zhang, Najia Mandi, Saralyn Riddell, Alexander E. Kobryn, Sergey Gusarov, Pawan Kumar, Karthik Shankar
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Article
Nanoscience & Nanotechnology
Ryan Kisslinger, Saralyn Riddell, Ajay P. Manuel, Kazi M. Alam, Aarat P. Kalra, Kai Cui, Karthik Shankar
Summary: The study demonstrates the formation of Ta2O5 nano-dimple arrays on non-native substrates and the synthesis of gold nanoparticles (Au NPs) on these arrays through anodization and annealing processes. Various factors affecting the formation of the arrays and the properties of Au NPs were investigated. The resulting plasmonic heterojunctions showed significantly higher local field enhancement and catalytic activity compared to Au NPs on quartz substrates.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Ebru Uzer, Pawan Kumar, Ryan Kisslinger, Piyush Kar, Ujwal Kumar Thakur, Karthik Shankar, Tom Nilges
NANOSCALE ADVANCES
(2019)
Article
Nanoscience & Nanotechnology
Ebru Uezer, Pawan Kumar, Ryan Kisslinger, Piyush Kar, Ujwal Kumar Thakur, Sheng Zeng, Karthik Shankar, Tom Nilges
ACS APPLIED NANO MATERIALS
(2019)