Chapter Four · failure evidence
What Electron Microscopy (TEM/SEM) got wrong, from 39 dissertations
The records document experimental and analytical failures encountered when applying scanning and transmission electron microscopy to sensitive materials and dynamic systems. Most investigations failed due to electron beam damage, specimen charging, preparation artifacts, contrast limitations, and algorithmic processing errors. These records come from PhD theses at 14 institutions, 2021 to 2026. Each links to its thesis. They were extracted by language models reading the full text, so treat each as a lead to read, not a verdict.
Electron beam exposure causes structural damage, radiolysis, and chemical degradation
High electron beam exposure triggered rapid structural collapse in metal-organic frameworks, degraded polymer substrates, and eliminated optical emission in dye-doped nanocrystals. Beam interactions also caused chemical reduction of sensitive compounds, artificial defect pinning during relaxation, and solvent radiolysis that produced bubbling and precipitation in liquid cells.
Tried and failed
transmission electron microscopy cross-section imaging applied to polymer-supported multilayer thin films. Reason: electron beam damage degraded the polymer substrate during characterization
Tried and failed
in situ transmission electron microscopy applied to ionic liquid electrospray emission. Outcome: unstable. Reason: destructive electron beam interactions caused dendritic growth artifacts on the emitting structure
Tried and failed
transmission electron microscopy with standard beam currents applied to metal-organic frameworks. Outcome: unstable. Reason: electron beam damage causes rapid crystallinity loss and structural collapse
Synthetic and analytical considerations for the preparation of amorphous metal–organic frameworks · Cambridge
Tried and failed
scanning electron microscopy imaging applied to fluorescent dye-doped organic nanocrystals. Outcome: no signal. Reason: excessive electron beam exposure caused optical damage eliminating narrow molecular emission
Dibenzoterrylene as a single photon source · Imperial
Tried and failed
scanning electron microscopy imaging applied to organic dye-doped nanocrystals. Outcome: no signal. Reason: electron beam exposure degrades narrow optical emission properties
Tried and failed
time correlation analysis from transmission electron microscopy applied to mesophase orientational relaxation dynamics. Reason: Electron beam exposure introduced defect pinning sites that artificially slowed and distorted the measured relaxation dynamics.
Tried and failed
transmission electron microscopy with electron diffraction applied to highly oxidizing tetravalent lanthanide compounds. Outcome: unstable. Reason: samples underwent beam-induced reduction in the electron beam
Topology and chemistry of competing interactions in tetravalent lanthanides · Georgia Tech
Tried and failed
In situ liquid-cell transmission electron microscopy applied to nanowire electrodes in organic electrolytes. Outcome: unstable. Reason: Electron beam radiolysis caused rapid electrolyte bubbling and uncontrolled nanoparticle precipitation, obscuring observation
In situ electron microscopy of nanomaterials dynamics in heterogeneous phase environments · MIT
Tried and failed
heavy alkali halide probes in electron microscopy applied to operando liquid-cell STEM imaging. Outcome: unstable. Reason: severe electron-beam-induced damage even at low electron beam doses
OPERANDO METHODS FOR ATOMIC-SCALE MECHANISTIC UNDERSTANDING OF INTERFACIAL ELECTROCATALYSIS · Cornell
Electrostatic charging and beam heating corrupt imaging and mechanical measurements
Charge buildup and beam-induced heating produced spurious movement in suspended nanoscale structures and distorted polymer deformation observations. These charging effects also obscured magnetic contrast, worsened degradation in insulating ceramics at lower voltages, and damaged conductive coatings during thermal cycling.
Tried and failed
in-situ electron microscopy deformation tracking applied to bulk polymer deformation. Reason: electron beam damage, charge buildup, and induced artifacts corrupted observations
Rubber particle cavitation in toughened Poly(methyl methacrylate) · Cranfield
Tried and failed
lowering acceleration voltage in transmission electron microscopy applied to insulating ceramic specimen imaging. Outcome: worse than baseline. Reason: lower voltage increased sample charging and beam-induced degradation instead of mitigating damage
Tried and failed
Lorentz transmission electron microscopy magnetic imaging applied to two-dimensional transition metal dichalcogenides. Outcome: no signal. Reason: Electron beam-induced defect generation and charging rapidly degraded magnetic contrast under continuous exposure.
Tried and failed
scanning electron microscopy for mechanical deflection measurement applied to suspended nanoscale mechanical structures. Outcome: unstable. Reason: electrostatic charging and beam-induced heating caused spurious movement and distorted dynamic measurements
STL NEMS fabrication, design, and inspection · Imperial
Tried and failed
thin conductive metal coating for in-situ SEM applied to high-temperature electron microscopy imaging. Outcome: unstable. Reason: coating degraded under combined electron beam exposure and thermal cycling, causing severe loss of imaging resolution
Specimen thickness and low contrast obscure features and degrade signals
Inelastic scattering in thick specimens severely diminished unscattered transmission and corrupted atomic displacement vector maps. In addition, low atomic number contrast, column projection overlap, and obstructed viewing angles prevented researchers from resolving internal pores or differentiating closely related phases.
Tried and failed
zero-loss energy-filtered transmission electron microscopy applied to thick biological cryo-EM specimens. Outcome: worse than baseline. Reason: Severe inelastic scattering in thick specimens drastically reduced unscattered electron transmission, degrading image SNR
Tried and failed
secondary electron SEM and optical microscopy applied to ceramic matrix composite microstructures. Outcome: no signal. Reason: insufficient atomic number or topographic contrast between chemically identical fiber and matrix phases
NITE–Processed SiC/SiC Ceramic Composites in Liquid Sandwich Vacuum Vessel · MIT
Tried and failed
estimating atomic polarization from cation displacement applied to scanning transmission electron microscopy images. Outcome: no signal. Reason: produced noisy, near-centrosymmetric, or reversed-sign vector maps in thick or distorted samples
ATOMIC-SCALE INSIGHTS INTO FERROIC MATERIALS WITH ELECTRON PTYCHOGRAPHY · Cornell
Considered and rejected
Considered and rejected: Rejected scanning electron microscopy (SEM) due to aerial view obscuring pores behind neighboring endothelial cells/GVs and inability to discern vacuoles from nuclei.
The effect of netarsudil on pore densities of Schlemm's canal inner wall endothelium in human eyes · OpenBU
Tried and failed
annular bright-field scanning transmission electron microscopy applied to distinguishing competing crystal structural models. Outcome: no signal. Reason: atomic column projection overlap and low signal-to-noise ratio prevented distinguishing light and heavy atom positions
Sample preparation and vacuum drying introduce physical artifacts
Focused ion beam milling and mechanical sectioning caused surface damage, knife marks, and folds that disguised genuine microstructural features. Furthermore, conventional negative staining and high-vacuum drying produced artificial shrinkage gaps and particle agglomeration.
Tried and failed
multibeam transmission electron microscopy imaging applied to focused ion beam prepared specimens. Outcome: no signal. Reason: ion beam preparation induced surface damage artifacts that obscured diffraction contrast features
Microstructural mechanisms of cyclic plasticity and fatigue damage in Ni-based superalloys · Imperial
Considered and rejected
Considered and rejected: Rejected microscopy images containing knife marks, folds, or prominent visual artifacts from cross-sectional area tracing.
Considered and rejected
Considered and rejected: Rejected scanning electron microscopy (SEM) in favor of CLSM due to artifact gaps caused by high-vacuum drying and difficulty distinguishing sealer from dentin.
Nachweis der Penetrationstiefe von BioRoot - Sealer in Dentintubuli unter Anwendung verschiedener Obturationsmethoden Demonstration of the penetration depth of BioRoot - Sealer in dentinal tubules using different obturation methods · open_UMR Marburg DSpace 10.0
Considered and rejected
Considered and rejected: Rejected conventional transmission electron microscopy (TEM) with negative staining/drying for visualizing MWNT-MS2 heteroaggregates due to drying-induced agglomeration artifacts, utilizing cryo-TEM plunge-freezing instead.
Automated segmentation and image reconstruction algorithms fail on noisy micrographs
Heuristic thresholding and insufficient smoothing on low-contrast micrographs caused background noise to merge into phantom particles and degraded feature extraction. Similarly, coordinate-based implicit neural representations failed to capture dense microstructures and high-frequency noise during volume reconstruction.
Tried and failed
automated image thresholding for nanoparticle morphology analysis applied to low-contrast electron microscopy images. Reason: insufficient image contrast caused segmentation artifacts, leading to inaccurate particle circularity measurements
Developing Uniform, Photon-Emitting Nanoprobes for Multi-Color Electron Microscopy · Harvard
Tried and failed
heuristic contrast adjustment and thresholding preprocessing applied to grayscale electron microscopy segmentation. Outcome: worse than baseline. Reason: degraded image quality and disrupted deep learning feature extraction
Deep Learning Approach for Cell Nuclear Pore Detection and Quantification over High Resolution 3D Data · Virginia Tech
Tried and failed
reducing image smoothing in segmentation pipeline applied to noisy transmission electron microscopy images. Reason: insufficient filtering caused background noise to merge with particles, creating phantom objects and reducing detection accuracy
Standardized Morphology Analysis of Cellulose Nanocrystals via a Semi-Automated Image Processing Approach · Georgia Tech
Tried and failed
per-scene coordinate-based implicit neural representations applied to noisy 3D electron microscopy volumes. Outcome: worse than baseline. Reason: struggled to accurately reconstruct high-frequency noise and dense microstructures with acceptable compression ratios
VoxelCompress: Learned Implicit Neural Compression of 3D Connectomics Data · Harvard
Instrument spatial resolution limits prevent characterization of nanoscale features
Standard scanning electron microscopy and wavelength dispersive spectroscopy lacked the spatial resolution needed to measure nanoscale precipitates, fine metallic grains, and surface ripples. Electron beam interactions during imaging also caused structural relaxation of fine ripple features.
Tried and failed
Scanning electron microscopy applied to nanoscale secondary phase precipitates. Outcome: data insufficient. Reason: Resolution limit was insufficient to resolve and measure nanoscale precipitates.
Ultrasonic characterization of Ti-5Al-5Mo-5V-3Cr · Iowa State
Tried and failed
scanning electron microscopy with wavelength dispersive spectroscopy applied to sub-micron nanophase metallic grains. Outcome: no signal. Reason: Feature size (~40 nm) was significantly below the instrument spatial resolution limit (~1 µm)
Novel applications of high-resolution environmental and paleomagnetic imaging · Harvard
Tried and failed
Tilted scanning electron microscopy applied to nanoscale 2D material ripples. Reason: Insufficient resolution for nanometer features and electron beam induced structural relaxation of ripples
Left open by the authors
Problems the authors named and did not get to.
Left open
Resolve potential-dependent ionic distribution changes in the electrochemical double layer using operando EC-STEM while mitigating beam damage and concentration issues. Blocker: Requires operando electrochemical scanning transmission electron microscopy (EC-STEM) lab equipment and physical samples
OPERANDO METHODS FOR ATOMIC-SCALE MECHANISTIC UNDERSTANDING OF INTERFACIAL ELECTROCATALYSIS · Cornell
Left open
Determine whether missing micronuclei in TEM sections of the scuticociliate parasite result from life stage variation or imaging artifacts. Blocker: Requires wet-lab culturing, biological specimens, and transmission electron microscopy (TEM) apparatus.
Left open
Perform cross-sectional transmission electron microscopy of single particle impacts to validate molecular dynamics simulation results. Blocker: Requires specialized physical experimental apparatus and transmission electron microscopy equipment.
Applying molecular dynamics simulations to the study of micro cold spray of yttria · UT Austin
Left open
Perform transmission electron microscopy on illite to observe frayed edge collapse in the presence of beryllium under varying conditions. Blocker: Requires a transmission electron microscope (TEM) and wet lab sample preparation facilities
Left open
Correlate simulated plastic strain gradients with transmission electron microscopy dislocation structures across multiple indentation depths. Blocker: Requires transmission electron microscopy (TEM) experimental facilities and indentation apparatus to observe dislocation structures
Crystal Plasticity Modeling of Heterogeneous Microstructure in Alloys · Georgia Tech
Left open
Perform transmission electron microscopy analysis to characterize the distribution, evolution, and morphology of oxide film particles near the bonded interface. Blocker: Requires physical bonded aluminum samples and access to transmission electron microscopy (TEM) lab equipment.
Feasibility studies of a novel extrusion-roll-bonding technology · Imperial
Left open
Investigate electron-beam induced exsolution and re-oxidation reversibility of exsolved nanoparticles on lanthanum nickel oxide double perovskites. Blocker: Requires transmission electron microscopy (TEM) facilities and physical perovskite samples.
Lanthanum nickel oxide based double perovskites and their exsolution phenomena · Imperial
Left open
Implement TEM-based electron holography or ptychography to image current density at sub-50 nm resolution and correlate flow with defects. Blocker: Requires physical transmission electron microscopy (TEM) experimental apparatus and specialized phase-contrast imaging hardware
Left open
Perform transmission electron microscopy (TEM) nano-characterization to assess crystal defects in AlN/AlGaN/AlN heterostructures. Blocker: Requires physical semiconductor samples and transmission electron microscopy (TEM) lab equipment
Polarization Engineering, Growth and Transport in Next-generation transistors on AlN platform · Cornell
Left open
Identify the chemical composition and nature of nanometer-scale clusters formed during electron beam damage in AlInN thin films. Blocker: Requires advanced electron microscopy / characterization apparatus (e.g., TEM/EDS/EELS) and physical AlInN samples.
Structural characterization and understanding growth kinetics of modern III-nitride epitaxial methods · Georgia Tech
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