Article
Chemistry, Physical
Junsuke Yamanishi, Yan Jun Li, Yoshitaka Naitoh, Yasuhiro Sugawara
Summary: This review introduces the operating principle and applications of photoinduced force microscopy (PiFM), including the gradient force, scattering force, and methods to eliminate photothermal effects. Two PiFM operating modes, in air based on the tapping mode and in vacuum based on the frequency modulation (FM) mode, are discussed along with the measurement results of SiNc clusters and semiconductor quantum dots.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2022)
Article
Chemistry, Physical
Bongsu Kim, Junghoon Jahng, Abid Sifat, Eun Seong Lee, Eric O. Potma
Summary: In illuminated tip-sample junctions, light absorption by the sample leads to local heating and thermal expansion of the material, affecting the measured photoinduced force in PiFM experiments. While thermal contributions have been demonstrated in the mid-infrared range, evidence for such thermal effects in the vis/NIR range of PiFM remains elusive. Development of a frequency domain PiFM allows for direct registration of the thermal relaxation dynamics after photoexcitation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Xuejie Bai, Hua Wei, Tian Qiu, Zhenxing Zhang, Yaqun He, Haifeng Wang
Summary: Triboelectric charging is a complex process where the charge sign may reverse due to slight changes in contact surface properties. Experimental results show that increasing applied force at the tip-sample interface enhances the charge transfer process, but excessive force can lead to tip damage and sample deformation. Ethanol/acetone rinsed SiO2 surfaces acquire negative charges when in contact with an original tip, while damaged tips result in positive charges. Additionally, ultrasonication can further enhance charge transfer at the tip-sample interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Rajarshi Roy, David Necas, Lenka Zajickova
Summary: This study demonstrates controlled formation of graphene nanobubbles on transferred graphene on standard SiO2/Si substrate by applying an external electric field. The dimensional attributes of nanobubbles can be manipulated by varying tip voltage and distance. Moreover, significant out-of-plane piezo-response was observed in the newly created nanobubbles, with a quadratic dependence of the effective piezoelectric coefficient on the increasing bubble creation ramp voltage.
Article
Chemistry, Multidisciplinary
Patrick D. Lomenzo, Liam Collins, Richard Ganser, Bohan Xu, Roberto Guido, Alexei Gruverman, Alfred Kersch, Thomas Mikolajick, Uwe Schroeder
Summary: The emergence of ferroelectric and antiferroelectric properties in HfO2 and ZrO2 high-k dielectrics is leading to unexpected technological developments. However, the lack of clear distinction between these behaviors is hindering progress. This study uses band-excitation piezoresponse force microscopy and molecular dynamics to elucidate electric field-induced phase transitions in ZrO2-based antiferroelectrics. The nanoscale phase transitions discovered in this study provide new opportunities for the development of nanoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Zhaogang Dong, Zackaria Mahfoud, Ramon Paniagua-Dominguez, Hongtao Wang, Antonio I. Fernandez-Dominguez, Sergey Gorelik, Son Tung Ha, Febiana Tjiptoharsono, Arseniy I. Kuznetsov, Michel Bosman, Joel K. W. Yang
Summary: This paper presents the near-field localization of true bound-states-in-the-continuum (BIC) resonance on arrays of silicon nanoantennas using electron energy loss spectroscopy. By breaking the antenna symmetry, emissive quasi-BIC resonances are observed. It is also demonstrated that the quasi-BIC resonances can significantly enhance localized light emission via the Purcell effect.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jinhyoung Lee, Eungchul Kim, Jinill Cho, Hyunho Seok, Gunhoo Woo, Dayoung Yu, Gooeun Jung, Hyeon Hwangbo, Jinyoung Na, Inseob Im, Taesung Kim
Summary: This study presents a novel method of tip-induced optoelectrical engineering that allows remote control and detection of interfacial charge transfer dynamics in hybrid molecular systems. The approach combines photo-induced force microscopy and Kelvin probe force microscopy to achieve high spatial resolution. The results reveal the optoelectrical origin of metal-molecule interfaces and demonstrate the potential for non-destructive tunneling control in ultrathin hybrid molecular systems.
Article
Chemistry, Multidisciplinary
Levente Juhasz, Roberto D. Ortuso, Kaori Sugihara
Summary: The study utilized quantitative friction force microscopy to measure the response of polydiacetylene to lateral forces, revealing the necessity of applying shear forces to characterize it at the nanoscale. The experiment confirmed the erroneous nature of the hypothesis regarding the higher force sensitivity at the edges and discovered a correlation between mechanochromism and thermochromism.
Article
Chemistry, Analytical
Gaukhar Askarova, Mandi Hesari, Chen Wang, Michael Mirkin
Summary: The use of scanning electrochemical microscopy (SECM) for nanoscale imaging of photoelectrochemical processes at semiconductor surfaces has been demonstrated recently. An improved experimental setup was developed to decouple the tip from the optical fiber and deliver light to the back of the tip capillary using a complex lens system, resulting in improved quality of approach curves and photo-SECM images.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Devon S. Jakob, Nengxu Li, Huanping Zhou, Xiaoji G. Xu
Summary: This article introduces a novel method to generate Coulombic force in KPFM, increasing the spatial resolution to approximately 25 nm. By integrating PiFM, high spatial resolution chemical distributions and surface potential maps can be obtained concurrently. This is expected to facilitate characterizations of nanoscale electrical properties of photoactive materials, semiconductors, and ferroelectric materials.
Article
Engineering, Environmental
Mengyu Wang, Wen-Xiong Wang
Summary: In this study, the researchers used a novel technique called whole-body expansion microscopy (whole-ExM) to visualize the impact of AgNPs on the notochord and skeletal muscle of zebrafish. They found that AgNPs caused deformation of the notochord and reduced and loosely arranged skeletal muscle. Furthermore, they showed that the main source of Ag+ was the dissolution of AgNPs in vivo.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Mengkang Xu, Xinpeng Tian, Qian Deng, Qun Li, Shengping Shen
Summary: By introducing nanocracks and applying continuously varying mechanical loading, the evolution of flexoelectricity around the crack tips in SrTiO3, Ba0.67Sr0.33TiO3, and TiO2 samples has been successfully measured. This method provides a reliable way to identify the significance of the flexoelectric effect and may open a new avenue for the study of flexoelectricity involving multiple physics phenomena such as flexoelectronics and the flexo-photovoltaic effect.
Article
Engineering, Electrical & Electronic
Wenhao Zhang, Xiqi Wu, Wenting Wang, Kaidi Zhang, Bowen Li, Yuhang Chen
Summary: The on-demand modulation of material properties at the nanoscale is crucial for the development of functional micro- and nanodevices. This study focuses on modulating the structural and electric properties of vanadium dioxide (VO2) films using a locally confined atomic force microscope (AFM) tip-induced electric field. The time stability and reversibility of the modulation are investigated, and potential applications in developing optoelectronic devices with arbitrary shapes are demonstrated.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Razmik A. Hovhannisyan, Sergey Yu Grebenchuk, Denis S. Baranov, Dimitri Roditchev, Vasily S. Stolyarov
Summary: The study uses lateral Josephson junctions (LJJ) to quantify the stray magnetic field of Co-coated cantilevers in magnetic force microscopy (MFM), establishing a spatial map. Based on the findings, integrating LJJs directly on the tips of cantilevers as nanosensors of local magnetic fields in scanning probe microscopes is suggested.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Spectroscopy
Jesvin Joseph, Lukas Spantzel, Maryam Ali, Dijo Moonnukandathil Joseph, Sebastian Unger, Katharina Reglinski, Christoph Krafft, Anne-Dorothea Mueller, Christian Eggeling, Rainer Heintzmann, Michael Boersch, Adrian T. Press, Daniela Taeuber
Summary: The recently developed PiF-IR microscopy offers high spectral resolution, surface sensitivity, and nanoscale spatial resolution. It has the potential to characterize cellular structures at the single-molecule level. PiF-IR was applied to polymerized F-Actin samples and mouse liver tissue, showing variations in contrast. However, interpreting and validating the data is challenging due to the presence of other proteins and the unique spatial resolution of PiF-IR.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Chemistry, Physical
Bongsu Kim, Junghoon Jahng, Abid Sifat, Eun Seong Lee, Eric O. Potma
Summary: In illuminated tip-sample junctions, light absorption by the sample leads to local heating and thermal expansion of the material, affecting the measured photoinduced force in PiFM experiments. While thermal contributions have been demonstrated in the mid-infrared range, evidence for such thermal effects in the vis/NIR range of PiFM remains elusive. Development of a frequency domain PiFM allows for direct registration of the thermal relaxation dynamics after photoexcitation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Spectroscopy
Abid Anjum Sifat, Eric O. Potma
Summary: The study focuses on the importance of tip morphology in tip-enhanced Raman scattering (TERS), explores the use of focused ion beams (FIB) for modifying tip structure, and demonstrates improved TERS signal strength through novel tip designs.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Multidisciplinary Sciences
Min Hi Park, Jeffrey L. Suhalim, Firas Elmastour, Santu K. Singha, Tadashi Imafuku, Ramanathan Venkatnarayan, Anette Christ, Alena Grebe, Sarah A. Oppelt, Dmitri Sviridov, Michael Bukrinsky, Eicke Latz, Eric O. Potma, Michael L. Fitzgerald
Summary: This study used non-linear optical microscopy to investigate plaque crystal structure and composition in SIV-infected macaques, revealing a cholesterol ester dominated composition. The findings help clarify the evolution of plaque core lipid and its role in systemic inflammation.
Article
Biochemical Research Methods
Richard C. Prince, Eric O. Potma
Summary: Coherent Raman scattering (CRS) microscopy is an optical imaging technique with great potential for biomedical research. Despite significant advancements in specificity, sensitivity, and practicality, broader dissemination of the technique remains a challenge. New developments and technical improvements have expanded the application space of CRS microscopy, but efforts are still needed to attract more users beyond enthusiasts.
JOURNAL OF BIOMEDICAL OPTICS
(2021)
Article
Nanoscience & Nanotechnology
Abid Anjum Sifat, Filippo Capolino, Eric O. Potma
Summary: The optical chiral properties of tightly focused laser beams can be characterized using force detection. By measuring the chiral properties of a beam in the microscopic focal volume, the difference in force measurements can provide information about the helicity density and the spin angular momentum density of light.
Article
Multidisciplinary Sciences
David Knez, Benjamin W. Toulson, Anabel Chen, Martin H. Ettenberg, Hai Nguyen, Eric O. Potma, Dmitry A. Fishman
Summary: In this study, a novel spectral imaging technique based on nondegenerate two-photon absorption is proposed for high-speed imaging in the mid-infrared range, allowing simultaneous acquisition of morphological and chemical information.
Article
Multidisciplinary Sciences
Jinwei Zeng, Mohammad Albooyeh, Mohsen Rajaei, Abid Anjum Sifat, Eric O. Potma, H. Kumar Wickramasinghe, Filippo Capolino
Summary: We have experimentally demonstrated the detection of magnetic force at optical frequencies, using a photoinduced magnetic dipole and a magnetic nanoprobe under structured light illumination. This method allows the direct detection of the magnetic force, revealing the magnetic nearfield distribution at the nanoscale.
Article
Optics
Junghoon Jahng, Sunho Lee, Seong-Gu Hong, Chang Jun Lee, Sergey G. Menabde, Min Seok Jang, Dong-Hyun Kim, Jangyup Son, Eun Seong Lee
Summary: This study reports, for the first time, the nanoscopic imaging of anomalous infrared phonon enhancement in bilayer graphene due to charge imbalance between its top and bottom layers. By modifying the multifrequency atomic force microscope platform, a hybrid nanoscale optical-electrical force imaging system is created, enabling the observation of correlation between IR response, doping level, and topographic information of graphene layers. The study also demonstrates the control of charge imbalance and diagnosis of subsurface cracks in few-layer graphene through chemical and mechanical approaches.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Junghoon Jahng, Eun Seong Lee
Summary: By developing a model based on coupled harmonic oscillators, we comprehensively describe the operation of photo-induced force microscopy (PiFM) and replicate all dynamic features from previous theories. Furthermore, by integrating a photo-induced thermal expansion force model, we uncover the underlying physical mechanism responsible for the unique signal behaviors observed in the sideband coupling mode.
Article
Materials Science, Multidisciplinary
Junghoon Jahng, Bongsu Kim, Eun Seong Lee
Summary: In this paper, a comprehensive understanding of the photoinduced thermal force between the metal coated tip and organic sample is provided. The surface and volume responses are quantitatively characterized, and the major contributors to the surface sensitivity are identified. Insights into surface-sensitive and volume-sensitive spectroscopic nanoimaging are offered.
Review
Chemistry, Multidisciplinary
Abid Anjum Sifat, Junghoon Jahng, Eric O. Potma
Summary: Photo-induced force microscopy (PiFM) is a scan probe technique that provides images with spectroscopic contrast at a nanometer spatial resolution. By utilizing the enhanced near field at the tip apex, PiFM can extract the additional force induced by the local polarization in the sample, generating photo-induced force maps. Since its inception, PiFM has become a useful nano-spectroscopic tool with expanding imaging capabilities and applications.
CHEMICAL SOCIETY REVIEWS
(2022)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Fernando Rodriguez, Hye Rin Lee, Teomara Rutherford, Christian Fischer, Eric Potma, Mark Warschauer
Summary: The study suggests that for first-generation college students, early planning and self-regulation are crucial for success in online courses, while low engagement may result in lower average grades.
LAK21 CONFERENCE PROCEEDINGS: THE ELEVENTH INTERNATIONAL CONFERENCE ON LEARNING ANALYTICS & KNOWLEDGE
(2021)