Lesson 8 Case Studies

Transcription

1 0.43 Lssn 8 Cas Studis Yu Will Larn Instrumntatin fr:. Lasr phtchmistry and phtlctrchmistry B. Scanning Prb Micrscpy C. PI cntrl in chmical nginring s wll as data tratmnt and prsntatin 1. Lasr phtchmistry and phtlctrchmistry a. Principl S w ν Phtxcitatin (1) h * S w k Sw * dc Sw cay f th xcitd stat (2) [ S ] int * k Sw Q t Q Elctrn transfr (ET) (3) 1 1 = k c τ τ app 0 q q TCNQ 0.37V TCNQ bsrptin and flurscnc spctra f Ru(bpy)3 2 in watr(dashd lin) and in (slid lin) StrnVlmr Equatin t masur ET rat 2 Optical Paramtric Oscillatr (OPO) ns Nd 3 YG pump lasr Z. F. ing, R. G. Wllingtn, P. F. Brvt, H. H. Girault, "Spctrlctrchmical Studis f Ru(bpy)3(2) at th Watr/1,2ichlrthan Intrfac", J. Phys. Chm. 100 (1996) b. LabVIEW ata cquisitin GPIB Oscillscp drivr iris diaphragm prism 30mJ pr puls fr 400nm t 2000nm 300mJ pr puls prating at 10Hz λ = 463nm Elctrchmical Wrkstatin watr 1,2dichlrthan mirrr filtr SHG Crystal prism lns mirrr mnchrmatr PM acquisitin systm phtdid scillscp 3 4 data handling Cathd (2) phtchmistryelctrgnratd Chmiluminscnc a. Principl nd Cathd Z. ing, B. M. Quinn, S. K. Haram, L. E. Pll, B.. Krgl,. J. Bard, "Elctrchmistry and lctrgnratd chmiluminscnc frm silicn nancrystal quantum dts", Scinc 296 (2002) E c E a nd hν * 5 Critrin fr xcitd stat frmatin E a E c 0.1 > E S 6

2 (2) phtchmistryelctrgnratd Chmiluminscnc Pwr supply Spctrmtr CC camra Phtmultiplir i (2) phtchmistryelctrgnratd Chmiluminscnc c. ata cquisitin Elctrchmical Wrkstatin V pplid Vltag Currnt PMT Pt * Cnnctin Bard SCB 68 Picam mtr NI Q card LabVIEW 7 8 ECL_PMT610.vi B. Scanning Prb Micrscpy Narfild Scanning Optical Micrscpy (NSOM r SNOM) a. principl Th diffractin limit in cnvntinal micrscpy (bb diffractin limit) 0.61λ S = N(numrical aprtur) 0.61λ = λ n sin θ Psitining th prb Sampl surfac Sampl surfac 5nm~5%λ 11 12

3 Shar frc dtctin B. Scanning Prb Micrscpy x,y,z Inchwrms Narfild Scanning Optical Micrscpy (NSOM r SNOM) amplitud /V frquncy/khz HV ppraching, scanning cntrllr HV zpushr ithr scillatin Elctrchmical Wrkstatin 13 Oscillatin utput Lckin amplifir Piz drivr Tuning frk Watr slutin Input Sampl PMT Fdback Cntrl signal Currnt ECL Intnsity 14 psitining f th tip t th substrat PF6.4µm PW6.4µm IF6.4µm PF6.4µm B. Scanning Prb Micrscpy Narfild Scanning Optical Micrscpy (NSOM r SNOM) Sharfrc dvic: tuning frk drivn by a lckin amplifir Fdback: micrpsitinr: lckin amplifir 1.inchwrm mtr stagcntrllr 2. Piz pushrcntrllr(using Q ut) Tw prcsss (1) Engag: prb apprachs t substrat & stays in narfild finish (2) scanning: t gt imags Y. Zu, Z. ing, J. Zhu, Y. L,. J. Bard, "Scanning Optical Micrscpy with an Elctrgnratd Chmiluminscnt Light Surc at a Nanmtr Tip", nal. Chm. 73 (2001) Y stp siz 15 start X stp siz 16 B. Scanning Prb Micrscpy Narfild Scanning Optical Micrscpy (NSOM r SNOM) b. Prgramming in LabVIEW Q O vltag ut cntrllramplifir 0.005V0.5V/stp till 8V800 V piz pushr 0.004µm/stp till 6.4µm Inchwrm cntrllr at spd f 1 µm/s Inchwrm mv 6.4 µm tim cuntr n th Q 6400 ms Finally withdraw 40 nm 17 18

4 Lt s play imag_dm.vi C. PI cntrl in chmical nginring Th Plant Simulatr subvi, which simulats this prcss, rads and dlays th prvius valv psitin and scals it accrding t th prcss gain. Th gain rprsnts hw fast th tank fills vrsus th psitin f th valv. Th prcss lad valu dpnds n th stat f HV101, th drain valv. Whn yu pn th valv, th tank lvl drps PI applicatin t Scanning Prb Micrscpy Rfrncs 1. Z. F. ing, R. G. Wllingtn, P. F. Brvt, H. H. Girault, "Spctrlctrchmical Studis f Ru(bpy)3(2) at th Watr/1,2 ichlrthan Intrfac", J. Phys. Chm. 100 (1996) Z. ing, B. M. Quinn, S. K. Haram, L. E. Pll, B.. Krgl,. J. Bard, "Elctrchmistry and lctrgnratd chmiluminscnc frm silicn nancrystal quantum dts", Scinc 296 (2002) Y. Zu, Z. ing, J. Zhu, Y. L,. J. Bard, "Scanning Optical Micrscpy with an Elctrgnratd Chmiluminscnt Light Surc at a Nanmtr Tip", nal. Chm. 73 (2001)

5 cquir nywh r Summary nalyz nywh r Prsnt nywh r Insitu ractin mnitring, lctrchmistry, spctrlctrchmistry can asily b dn. 25