Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing.

Porous tin dioxide is an important low-cost semiconductor applied in electronics, gas sensors, and biosensors. Here, we present a versatile template-assisted synthesis of nanostructured tin dioxide thin films using cellulose nanocrystals (CNCs). We demonstrate that the structural features of CNC-templated tin dioxide films strongly depend on the precursor composition. The precursor properties were studied by using low-temperature nuclear magnetic resonance spectroscopy of tin tetrachloride in solution. We demonstrate that it is possible to optimize the precursor conditions to obtain homogeneous precursor mixtures and therefore highly porous thin films with pore dimensions in the range of 10-20 nm (ABET = 46-64 m2 g-1, measured on powder). Finally, by exploiting the high surface area of the material, we developed a resistive gas sensor based on CNC-templated tin dioxide. The sensor shows high sensitivity to carbon monoxide (CO) in ppm concentrations and low cross-sensitivity to humidity. Most importantly, the sensing kinetics are remarkably fast; both the response to the analyte gas and the signal decay after gas exposure occur within a few seconds, faster than in standard SnO2-based CO sensors. This is attributed to the high gas accessibility of the very thin porous film

PS1-22: The VDW Vital Signs File: Strengths, Issues, and Recommendations for the Future

Background/Aims: The Virtual Data Warehouse (VDW) Vital Signs file is an important data source for clinical information that is often used in VDW based research. Vital signs traditionally include pulse, diastolic blood pressure, systolic blood pressure, respiratory rate, and body temperature. This file contains multiple records of these data for each patient as well as related data such as measure date, height, weight, body mass index, and position for blood pressure reading. Despite this importance, it has not thus far been subjected to broad, systematic scrutiny for the extent and quality of the data at implementing sites. That is soon to be remedied by the subject effort of the proposed poster. We have devised an analysis plan and are writing code to generate copious amounts of descriptive data. These data and our group’s cross-site analysis thereof will be documented in a report to the HMORN. The report will serve as a basis for establishing the current state of the Vital Signs files at implementing sites, and for making recommendations for future improvements. It should also prove quite useful as a reference for future grant writing efforts

Research data supporting "Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing"

the dataset provides the raw data for a variety of characterisation: Photographs, transmittance spectra, 119Sn NMR, SEM, TEM, FFT, sensor measurements, XRD, sorption. A detailed summary (.pdf) is provided to complement the data.The German Science Fundation (DFG) for funding in the context of the Nanosystems Initiative Munich (NIM) Excellence Cluster

Herpes Zoster and Postherpetic Neuralgia Surveillance Using Structured Electronic Data

OBJECTIVE: To develop electronic algorithms for rapid, automated surveillance for herpes zoster and postherpetic neuralgia (PHN) using codified electronic health data