Materials Science. Hand axes like this one found in the United Arab Emirates indicate humans left Africa 125,000 years ago.

Transcription

1

2 Summary Materials Science Ion Beam Analysis 3 MV Tandetron TM Accelerator Rutherford Backscattering Spectrometry (RBS) Elastic Recoil Detection (ERD) Nuclear Reaction Analysis (NRA) Ion implant/channeling Conclusion 2

3 Materials Science Hand axes like this one found in the United Arab Emirates indicate humans left Africa 125,000 years ago. Science/AAAS Dacian Koson 2000 years ago. Anti-reflecting coatings MgF2 3

4 Applications of thin films 4

5 5

6 6

7 Material fabrication New technology Characterization (amongst them IBA) Emerging New material Tuning/adjusting deposition parameters 7

8 Let s go inside the lab! 8

9 3 MV IFIN-HH 9

10 Goniometer from IBA chamber 10

11 11

12 RBS Thin films: ZnO, InN, WCN CarbonNanoWalls, TiO 2 Solar cells WS 2 Glasses of Te Thicknesses: from 0.5 nm up to 2 microns 12

13 Elemental analysis technique where alpha particles are scattered off of targets and is used to determine elemental composition and thin-film thickness. 13

14 RBS measurements Tribological samples of WCN/TiB/TiN deposited on Si Produced in IFIN-HH (dr. A. &G. Mateescu) Applications: hard coatings, space applications Information needed : thickness and stoichiometry (atomic composition) 14

15 Analysis sample no. 32 WCN/TiB 2 /TiN SEM cross section RBS spectrum WCN/TiB/TiN x6 layers 15

16 Elastic Recoil Detection 16

17 ERD of a DLC sample containing 30% H Energy [kev] R2_DLCERD.rbs Simulated Counts Channel Experimental conditions: He 2+ ions, 2.5 MeV, Mylar foil in front of the RBS mobile detector (11 μm) Thickness of 6590 at/cm 2, (510 nm 17 ), 1.4 g/cm 3

18 H measurement in CNWs 30% H in DLC substrate Carbon Nanowalls 12%-5% H in CNW sample 18

19 Nuclear Reaction Analysis 19

20 NRA of TiH MeV MeV gamma rays

21 Ion implantation experiments Protons: 1e13-1e15 atoms/cm 2 Helium: 1e13-1e15 atoms/cm 2 Niobium: 6e14 2e15 atoms/cm 2 Silver: 2e15 atoms/cm 2 Gold:1e15 atoms/cm 2 Silicon: 1e16 atoms/cm 2 Iron: 1e16 atoms/cm 2 21

22 Ion channeling on a monocrystaline silicon sample The minimum yield 2.5%. This value shows that the sample is of very good crystallinity. 22

23 Effects of Au ion 1.5 MeV on polymeric nanocomposites 23

24 BEFORE AFTER Increase of hardness: 0.63 GPa before Au + implantation and 1.88 after. 24

25 C12+C13 reaction experiment Collaborators from China: prof. X. Tang group Investigating C-13+C-12 Reaction by the Activation Method. Sensitivity Tests D. Chesneanu, L. Trache, R. Margineanu, A. Pantelica, D. Ghita, M. Straticiuc, I. Burducea, A. M. 25 Blebea-Apostu, C. M. Gomoiu and X. Tang, AIP Conf. Proc, vol. 1645, 311 (2015)

26 Are we there yet? Fusion cross section of 12 C+ 13 C at sub-barrier energies N.T. Zhang, X.D. Tang, H. Chen, D. Chesneanu, M. Straticiuc, L. Trache, I. Burducea, K.A. Li, Y.J. Li, D.G. Ghita, R. Margineanu, A. Pantelica and C. Gomoiu Published online: 12 February DOI:

27 CONCLUSION IBA methods offer valuable information for materials fabricants in order to improve and adjust their deposition methods which could lead to new materials and technologies Apply for beamtime: PAC meeting 27

28 References 1.Compositional, morphological and mechanical investigations of monolayer type coatings obtained by standard and reactive magnetron sputtering from Ti, TiB2 and WC V. Jinga, A. O. Mateescu, D. Cristea, G. Mateescu, I. Burducea, C. Ionescu, L. S. Craciun, I. Ghiuta, C. Samoila, D. Ursutiu, D. Munteanu Applied Surface Science 358 (2015) doi: /j.apsusc , Morphological and compositional investigations of the tribological coatings with quaternary & pentanary composition, obtained from WC, TiB2 and Ti by DC standard & reactive magnetron sputtering A. O. Mateescu, G. Mateescu, L. S. Craciun, C. Ionescu, I. Burducea Journal of Optoelectronics and Advances Materials, Vol. 17, No , November December 2015, p I. Burducea et al. / Nuclear Instruments and Methods in Physics Research B 359 (2015)

29 Thank you for your attention! 29