READ ME These data were collected at the National EPSRC XPS Users' Service (NEXUS), an EPSRC Mid-Range Facility located at Newcastle University, Newcastle upon Tyne, UK. The data stored here underpins the following publication: Barlow, A.J. et al., Chemically specific identification of carbon in XPS imaging using Multivariate Auger Feature Imaging (MAFI), Carbon 107, pp. 190-197 (2016) DOI: http://dx.doi.org/10.1016/j.carbon.2016.05.073 Data supporting this publication is openly available under an 'Open Data Commons Open Database License'. Additional metadata are available at: http://dx.doi.org/10.17634/135957-1. Please contact Newcastle Research Data Service at rdm@ncl.ac.uk for access instructions. These data were used in the analysis performed by Neal Fairley in the video entitled "Graphene Oxide/Reduced Graphene Oxide Stage Map in CasaXPS" on the YouTube channel "CasaXPS Casa Software". The processed data stored here are indicative of the results achievable following the analysis presented in that video. ======================== Introductory information ======================== The data is stored in ISO standard VAMAS format (.vms) as described by ISO 14976:1998. Data files: Descriptions: 1)Barlow_GrapheneOxideXPSMap_RawData.vms This is the raw data as it was received from the instrument after conversion from .VGD to .AVG and finally .VMS. It contains the raw C1s, O1s and CKLL spectra at each pixel in the map. 2)Barlow_GrapheneOxideXPSMap_C1sO1sAtConcImages.vms The resulting % Atomic Concentration Maps after charge correction, defining regions, generating region images and quantifying these images. Images are scaled up in CasaXPS. 3)Barlow_GrapheneOxideXPSMap_GO-rGOMaps.vms Maps generated by fitting the C1s peak at each pixel with a line shape generated from the GO and rGO regions of the data. Each component of the C1s peak fit is then used to generate an image based on that components intensity. The lineshapes used were generated from the data itself, using the % Atomic Concentration maps to create false colour images, and then summing spectra from the original (calibrated) data to generate a set of spectra representative of the "phases" on the surface, i.e. GO and rGO. Interpolated difference spectra were generated to generate synthetic lineshapes from the data that represent the most GO-like and rGO-like spectra, and these were used to fit the raw C1s peak. 4)Barlow_GrapheneOxideXPSMap_CKLLMAFI.vms Maps of the carbon and oxygen atomic %, along with the processed Multivariate Auger Feature Imaging (MAFI) result. The CKLL spectra were first smoothed using MVA within CasaXPS, TFA Predict Optimal Scaling, 5 abstract factors. The data is smoothed, differentiated, and regions applied to find the D-Parameter, which is then used to generate region images showing the D-Parameter spatially, i.e. the MAFI image. The image is then scaled up. 5)Barlow_GrapheneOxideXPSMap50um_RawData.vms This is raw data collected from a smaller area on the sample using a 50um X-ray spot size. ========================== Methodological information ========================== The data was collected on a Thermo Scientific K-Alpha XPS Instrument. Details are below. Date of collection: 12/06/2015 Instrument name: K-Alpha Manufacturer: Thermo Scientific, East Grinstead, UK X-ray Source: Microfocused monochromatic AlKa X-ray Energy: 1486.6eV X-ray Voltage/Current/Power: 12kV/1.2mA/14.4W (at 100um spot size) Spot Size: 100 x 200 microns Emission angle: Zero degrees emission (i.e. 90 degrees to the surface plane), or take-off angle of 90 degrees Pass energy: C1s and O1s regions 20eV, CKLL region 40eV Energy step size: C1s and O1s regions 0.1eV, CKLL region 0.5eV Dwell time: 100ms Number of Scans: C1s and O1s regions 1 scan, CKLL region 10 scans Charge neutralisation: Dual-beam (electron and ion) flood gun utilised Number of analysis positions: Stage rastered map of 25x29 points Stage step size: 200um per step ======= Contact ======= Please contact rdm@ncl.ac.uk for further information