Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725413
Title: Cluster production in the matrix assembly cluster source
Author: Terry, William David
ISNI:       0000 0004 6423 4914
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2017
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Abstract:
This thesis focuses on the development of the Matrix Assembly Cluster Source (MACS). Firstly, a transmission mode MACS instrument has been upgraded and integrated with a Time-Of-Flight mass filter. An equivalent cluster beam current of 100 nA of silver nanoclusters has been achieved (previously several nA). Furthermore, an intrinsic size control has been demonstrated in the 1-5 nm range by varying the silver concentration in the matrix. The MACS has been demonstrated in a reflection regime, reaching a ~1% conversion of incident ions to clusters (~0.03% in transmission). The effect of the beam-plate geometry has been investigated and a new reflection mode system commissioned, producing a maximum equivalent silver cluster current of 170±16 nA. An average equivalent current of 40 nA has been deposited for 45 minutes. Nanocluster arrays have been demonstrated to preferentially immobilize dye molecules, the primary step towards label-free cluster-based biochips. Finally, visible range ion-induced light emission from the matrix was studied. Optical measurements demonstrate significant change in the ion-induced light emission spectra with the addition of O2, N2, or Ag to the matrix. By careful analysis of the emission spectra, the thickness, composition, and in certain cases, molecular composition of the matrix can be accessed.
Supervisor: Not available Sponsor: Leverhulme Trust
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.725413  DOI: Not available
Keywords: QC Physics
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