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Michelle Weber

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Papers by Michelle Weber

Research paper thumbnail of A neutron scattering perspective on the structure, softness and dynamics of the ligand shell of PbS nanocrystals in solution

Chemical Science, 2020

Time-averaged and energy-resolved neutron and X-ray scattering reveal the structure of the ligand... more Time-averaged and energy-resolved neutron and X-ray scattering reveal the structure of the ligand shell, temperature-dependent diffusion and the phonon spectrum of PbS nanocrystals functionalized with oleic acid in solution.

Research paper thumbnail of Opportunities and challenges for electrochemistry in studying the electronic structure of nanocrystals

Physical Chemistry Chemical Physics, 2019

We review the state-of-the-art of determining the electronic structure of nanocrystals in thin fi... more We review the state-of-the-art of determining the electronic structure of nanocrystals in thin films by electrochemistry and emphasize the benefits of correlating electrochemical with spectroscopic methods to this end.

Research paper thumbnail of Electron-Conducting PbS Nanocrystal Superlattices with Long-Range Order Enabled by Terthiophene Molecular Linkers

ACS applied materials & interfaces, Jan 25, 2018

PbS nanocrystals are surface-functionalized with the organic semiconductor 5,5″-dithiol-[2,2'... more PbS nanocrystals are surface-functionalized with the organic semiconductor 5,5″-dithiol-[2,2':5,2″-terthiophene] and assembled to afford hybrid nanostructured thin films with a large structural coherence and an electron mobility of 0.2 cm/(V s). Electrochemistry, optical spectroscopy, and quantum mechanical calculations are applied to elucidate the electronic structure at the inorganic/organic interface, and it is established that electron injection into the molecule alters its (electronic) structure, which greatly facilitates coupling of the neighboring PbS 1S states. This is verified by field-effect and electrochemically gated transport measurements, and evidence is provided that carrier transport occurs predominantly via the 1S states. The presented material allows studying structure-transport correlations and exploring transport anisotropies in semiconductor nanocrystal superlattices.

Research paper thumbnail of Comparison of the yield of 19-G eXcelon core needle to a 21-G EBUS needle during endobronchial ultrasound guided transbronchial needle aspiration of mediastinal lymph nodes for the detection of granulomas in cases of suspected sarcoidosis

Journal of thoracic disease, 2017

Research paper thumbnail of Patient With Slow-Growing Mediastinal Mass Presents With Chest Pain and Dyspnea

Chest, 2016

A 52-year-old white woman presented with severe pain over the right upper abdomen and nonpleuriti... more A 52-year-old white woman presented with severe pain over the right upper abdomen and nonpleuritic, right-sided, lower chest-wall pain. Her pain had progressively gotten more frequent and severe over the last 5 months. It was also associated with a nonexertional, pressure-like sensation in the central chest. The patient denied any shortness of breath, fevers, cough, or any sputum production. She was taking levothyroxine for hypothyroidism and was a 30-pack-year current smoker; there was no history of drug abuse or occupational exposure. Previous chest radiographs dating back to 5 years consistently showed an elevated right-sided hemidiaphragm without any infiltrates or effusions; cardiomediastinal structures were unremarkable. She had not had a previous workup for these abnormal findings.

Research paper thumbnail of Broad-Range Direct Detection and Identification of Fungi by Use of the PLEX-ID PCR-Electrospray Ionization Mass Spectrometry (ESI-MS) System

Journal of Clinical Microbiology, 2013

The PLEX-ID system is a novel technology that couples PCR amplification and electrospray ionizati... more The PLEX-ID system is a novel technology that couples PCR amplification and electrospray ionization-mass spectrometry to identify pathogens directly in clinical specimens. The analytical performance of the PLEX-ID Broad Fungal assay was compared with that of traditional culture identification by using 91 characterized fungal culture isolates (64 manufacturer-claimed and 27 nonclaimed organisms) and directly by using 395 respiratory specimens. Discordant results were resolved by D2 large-subunit ribosomal DNA fungal sequencing. Environmental studies were performed to monitor for potential contamination. The PLEX-ID Broad Fungal assay correctly identified 95.6% (87/91) and 81.3% (74/91) of the culture isolates to the genus and species levels, respectively. Of the manufacturer-claimed organisms, 100% (64/64) and 92.2% (59/64) were correctly identified to the genus and species levels, respectively. Direct analysis of respiratory specimens resulted in 67.6% (267/395) and 66.6% (263/395) ...

Research paper thumbnail of A neutron scattering perspective on the structure, softness and dynamics of the ligand shell of PbS nanocrystals in solution

Chemical Science, 2020

Time-averaged and energy-resolved neutron and X-ray scattering reveal the structure of the ligand... more Time-averaged and energy-resolved neutron and X-ray scattering reveal the structure of the ligand shell, temperature-dependent diffusion and the phonon spectrum of PbS nanocrystals functionalized with oleic acid in solution.

Research paper thumbnail of Opportunities and challenges for electrochemistry in studying the electronic structure of nanocrystals

Physical Chemistry Chemical Physics, 2019

We review the state-of-the-art of determining the electronic structure of nanocrystals in thin fi... more We review the state-of-the-art of determining the electronic structure of nanocrystals in thin films by electrochemistry and emphasize the benefits of correlating electrochemical with spectroscopic methods to this end.

Research paper thumbnail of Electron-Conducting PbS Nanocrystal Superlattices with Long-Range Order Enabled by Terthiophene Molecular Linkers

ACS applied materials & interfaces, Jan 25, 2018

PbS nanocrystals are surface-functionalized with the organic semiconductor 5,5″-dithiol-[2,2'... more PbS nanocrystals are surface-functionalized with the organic semiconductor 5,5″-dithiol-[2,2':5,2″-terthiophene] and assembled to afford hybrid nanostructured thin films with a large structural coherence and an electron mobility of 0.2 cm/(V s). Electrochemistry, optical spectroscopy, and quantum mechanical calculations are applied to elucidate the electronic structure at the inorganic/organic interface, and it is established that electron injection into the molecule alters its (electronic) structure, which greatly facilitates coupling of the neighboring PbS 1S states. This is verified by field-effect and electrochemically gated transport measurements, and evidence is provided that carrier transport occurs predominantly via the 1S states. The presented material allows studying structure-transport correlations and exploring transport anisotropies in semiconductor nanocrystal superlattices.

Research paper thumbnail of Comparison of the yield of 19-G eXcelon core needle to a 21-G EBUS needle during endobronchial ultrasound guided transbronchial needle aspiration of mediastinal lymph nodes for the detection of granulomas in cases of suspected sarcoidosis

Journal of thoracic disease, 2017

Research paper thumbnail of Patient With Slow-Growing Mediastinal Mass Presents With Chest Pain and Dyspnea

Chest, 2016

A 52-year-old white woman presented with severe pain over the right upper abdomen and nonpleuriti... more A 52-year-old white woman presented with severe pain over the right upper abdomen and nonpleuritic, right-sided, lower chest-wall pain. Her pain had progressively gotten more frequent and severe over the last 5 months. It was also associated with a nonexertional, pressure-like sensation in the central chest. The patient denied any shortness of breath, fevers, cough, or any sputum production. She was taking levothyroxine for hypothyroidism and was a 30-pack-year current smoker; there was no history of drug abuse or occupational exposure. Previous chest radiographs dating back to 5 years consistently showed an elevated right-sided hemidiaphragm without any infiltrates or effusions; cardiomediastinal structures were unremarkable. She had not had a previous workup for these abnormal findings.

Research paper thumbnail of Broad-Range Direct Detection and Identification of Fungi by Use of the PLEX-ID PCR-Electrospray Ionization Mass Spectrometry (ESI-MS) System

Journal of Clinical Microbiology, 2013

The PLEX-ID system is a novel technology that couples PCR amplification and electrospray ionizati... more The PLEX-ID system is a novel technology that couples PCR amplification and electrospray ionization-mass spectrometry to identify pathogens directly in clinical specimens. The analytical performance of the PLEX-ID Broad Fungal assay was compared with that of traditional culture identification by using 91 characterized fungal culture isolates (64 manufacturer-claimed and 27 nonclaimed organisms) and directly by using 395 respiratory specimens. Discordant results were resolved by D2 large-subunit ribosomal DNA fungal sequencing. Environmental studies were performed to monitor for potential contamination. The PLEX-ID Broad Fungal assay correctly identified 95.6% (87/91) and 81.3% (74/91) of the culture isolates to the genus and species levels, respectively. Of the manufacturer-claimed organisms, 100% (64/64) and 92.2% (59/64) were correctly identified to the genus and species levels, respectively. Direct analysis of respiratory specimens resulted in 67.6% (267/395) and 66.6% (263/395) ...

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