메뉴 건너뛰기




Volumn 79, Issue 13, 2007, Pages 4977-4986

Model of vapor-induced resistivity changes in gold-thiolate monolayer-protected nanoparticle sensor films

Author keywords

[No Author keywords available]

Indexed keywords

CHEMIRESISTORS; FILM SWELLING EFFICIENCIES; MICROANALYTICAL SYSTEMS; ORGANIC VAPORS; PARTITION COEFFICIENTS;

EID: 34447306340     PISSN: 00032700     EISSN: None     Source Type: Journal    
DOI: 10.1021/ac070068y     Document Type: Article
Times cited : (107)

References (63)
  • 7
    • 34447295480 scopus 로고    scopus 로고
    • Wohltjen, H.; Snow, A. W. PCT Int. Appl. WO A1 9927357, 1999.
    • Wohltjen, H.; Snow, A. W. PCT Int. Appl. WO A1 9927357, 1999.
  • 21
  • 31
    • 0034229409 scopus 로고    scopus 로고
    • Grate, J. W. Chem. Rev. 2000, 100 (7), 2627-2647.
    • (2000) Chem. Rev , vol.100 , Issue.7 , pp. 2627-2647
    • Grate, J.W.1
  • 49
    • 84902479550 scopus 로고    scopus 로고
    • Peak widths of <100 ms have been measured with a similar C8-MPN-coated CR sensor in a low-dead-detector cell downstream from a micro-fabricated column using a microfabricated pump for sample transport. Kim, H.; Steinecker, W. H.; Lambertus, G. R.; Astle, A. A.; Najafi, K.; Zellers, E. T.; Bernal, L. P.; Washabaugh, P. D.; Wise K. D. Proceedings 10th International Conference on Miniaturized Systems for Chemistry and Life Sciences-μTAS '06, Tokyo, Japan, November 5-9, 2006; pp 1037-1039.
    • Peak widths of <100 ms have been measured with a similar C8-MPN-coated CR sensor in a low-dead-volume detector cell downstream from a micro-fabricated column using a microfabricated pump for sample transport. Kim, H.; Steinecker, W. H.; Lambertus, G. R.; Astle, A. A.; Najafi, K.; Zellers, E. T.; Bernal, L. P.; Washabaugh, P. D.; Wise K. D. Proceedings 10th International Conference on Miniaturized Systems for Chemistry and Life Sciences-μTAS '06, Tokyo, Japan, November 5-9, 2006; pp 1037-1039.
  • 52
    • 34447324477 scopus 로고    scopus 로고
    • Densities in the range of 3-3.5 g/mL have been reported in refs 6 and 36 for C8-MPNs smaller than those used in this work. The value of 1.2 g/cm 3 reported in ref 14 on the basis of profilometer measurements of cast C8-MPN films appears to be in error. For the MPNs in this study, the estimated density is 4.3 g/mL if the ligand density is assumed to be that of liquid n-octanethiol (0.845 g/mL, For the purposes of estimating film thickness from TSMR-derived film masses, it is reasonable to assume a certain fractional free within the film. Grate et al. suggested a range of 0.26-0.32 in ref 25 that depends on assumed packing arrangements. Accordingly, we have adopted a value of 0.30 for thickness estimates. However, since the actual free could not be measured, it was neglected for purposes of estimating K values and modeling CR sensitivities. This will yield less conservative (i.e, higher) estimates of the partition coefficient for a given vapor. In
    • s.
  • 56
    • 0003998388 scopus 로고
    • Weast, R. C, Ed, 76th ed, CRC Press: Boca Raton, FL
    • Weast, R. C., Ed. CRC Handbook of Chemistry and Physics, 76th ed.; CRC Press: Boca Raton, FL, 1995.
    • (1995) CRC Handbook of Chemistry and Physics
  • 57
    • 34447334656 scopus 로고    scopus 로고
    • A coated CR noise level of 1 ppm represents a typical resolution obtained after circuit optimization. Higher and lower values were observed. Observed noise levels were determined by the circuit components employed, since replacing the CR with a common resistor of identical resistance yielded no reduction in noise. This was true for type A, B, and C devices, indicating that the observed noise is independent of device size over the range examined here. MPN films have been shown to exhibit classical 1/f noise with a fundamental lower limit that is theoretically much lower than that reported here. With the proper implementation of analog circuitry for amplification and filtering, baseline noise could be reduced by 1 or 2 orders of magnitude see ref 57
    • A coated CR noise level of 1 ppm represents a typical resolution obtained after circuit optimization. Higher and lower values were observed. Observed noise levels were determined by the circuit components employed, since replacing the CR with a common resistor of identical resistance yielded no reduction in noise. This was true for type A, B, and C devices, indicating that the observed noise is independent of device size over the range examined here. MPN films have been shown to exhibit classical 1/f noise with a fundamental lower limit that is theoretically much lower than that reported here. With the proper implementation of analog circuitry for amplification and filtering, baseline noise could be reduced by 1 or 2 orders of magnitude (see ref 57).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.