Surface acoustic wave chemical microsensors based on covalently bound self‐assembled host monolayers**
Source abstract
Abstract
Novel asymmetric cyclodextrin derivatives have been synthesized. The materials form self‐assembled host monolayer thin films under the action of silane coupling reagents. Ultrasensitive (low‐ppm) sensors for volatile organic compounds have been developed based on these and related materials, and it is suggested that pattern recognition with an array of such sensors could be a feasible approach to the identification of a particular organic material.
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Research context
OpenAlex topics: Acoustic Wave Resonator Technologies · Analytical Chemistry and Sensors · Molecular Junctions and Nanostructures
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References (35)
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20. (a) I: TLC (benzene/ethanol 4:1 v/v): R1= 0.48.1H‐NMR (DMSO‐d6) δ: 3.87 (br. d 6H‐C(5). J ' 9 Hz); 4.17 (br. d. 6H‐C(6) J ≈ 9 Hz: 4.26 (d × d. 6H‐C(4). J3.4= 9.0 Hz J4.5= 9.5 Hz; 4.38 (br d 6H‐C(6) J ≈ 9 Hz: 4.88 (d × d. 6H‐C(2). J1.2= 3.3 Hz. J2.3. = 10.5 Hz); 4.92 (t 6H‐OC(6) J ≈ 4.5‐5.9 Hz); 5.42 (d. 6H‐C(1) J1.2= 3.2 Hz); 6.06 (d × d 6HC(3). J3.4= 9.0. J2.3= 10.5); 6.90 (t 12H‐Cm Jo.m≈ Jm.p=7.6‐7.8 Hz);7.05 (t. 12H‐Cm. Jo.m≈ Jm.p= 7.7 Hz); 7.28 (t. 6H‐Cp. Jm.p= 7.6 Hz); 7.30 (d 12H‐Co Jo.m= 7.8 Hz); 7.31 (t 6H‐CpJm.p= 7.6 Hz); 7.44 (d 12H‐CoJo.m=7.8). FTIR (KBr): 3426 cm−1(m br hydroxyl) 1736 cm−1(vs carbonyl); 1726 cm−1(vs sh carbonyl); 1601 cm−1(w phenyl); 1585 cm−1(w phenyl): 1451 cm−1(m. phenyl). 1281 cm−1(s) 1176 1096. 1044 1027 cm−1(vs br. C‐O) 706 cm−1(vs. phneyl). b) 2: TLC (benzene/ethanol 4:1 v/v): R1= 0.63. 'H‐NMR (DMSO‐d6) ≈: 3.90 (d 7H‐C(5). J ≈ 12 Hz); 4.10 (d. 7H‐C(6) J ≈ 12 Hz); 4.26 (d × d 7H‐C(4) J3.4≈ J4.5≈ 9.0 Hz): 4.36 (d. 7H‐C(6). J ≈ 12 Hz); 4.95 (d × d. 7H‐C(2) J1.2≈ 3 Hz J2.3≈ 10.5 Hz): 5.47 (d. 7H‐C(1) J1.2≈ 3 Hz); 5.91 (d × d.7H‐C(3) J3.4≈ 9.0. J2.3≈ 10.5); 6.96 (t. 14H‐Cm. Jo.m≈ Jm.p≈ 6‐9 Hz); 7.09 (t 14H‐Cm Jo.m≈ Jm.p≈ 6‐9 Hz): 7.28 (t. 7H‐CpJm.p≈ 6‐9 Hz);7.35 (d 14H‐Co. Jo m≈ 6 Hz): 7.37 (t 7H‐Cp. Jm.p≈ 9 Hz): 7.46 (d. 14HCoJo.m ≈ 6 Hz). FTIR (KBr): 3431 cm−1(m br. hydroxyl) 1734 cm−1(vs carbonyls; 1726 cm−1(vs sh carbonyl); 1600 cm−1(w phenyl); 1582 cm−1(w phenyl); 1451 cm−1(m. phenyl). 1278 cm−1(s) 1176. 1094 1040. 1025 cm−1(vs. br C‐O) 705 cm−1(vs phneyl). c) 3: TLC (chloroform: methanol: water = 50: 10:0.1): R1= 0.43.1H‐NMR (CDCl ): ≈ 2.05 and 2.06(2s. AcO). 3.71 (d H5C(6) J = 12 Hz). 3.84 to 4.02 (m. H‐C(4) and H‐C(5)) 4.05 (d Ha‐C(6). J =12 Hz). 4.68 (dd H‐C(2) J1.2= 6 Hz J2.3= 6Hz) 5.15 (d. H‐C(1) J = 6 Hz). 5.34(dd H‐C(3)). d) 4: Compound 4 was purchased from Fuka. e) 5:1H‐NMR (CDCI3) ≈: 10.4 (s 6H H‐OAr) 7.16 (d. 12H. H‐Ar). 6.83 (t 6H. H‐Ar) 3.91 (s 12H CH2(Ar)2).
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28. (a) The surface coverages calculated from mass loading‐using method given in [11b] are 6.2 × 10‐7g/cm2 4.0 × 10−7g/cm2 8.6 × 10−7g/cm2 4.0 × 10−7g/cm2 and 5.6 × 10−7g/cm2for compounds 1‐5 respectively. For the x‐cyclodextrin system (1) the estimated film thickness is therefore approximately 4.8 nm when a liquid density of 1.327 g/cm3for BTCSH [11c] and solid crystal density of 1.256 g/cm3for α‐cyclodextrin [15] is used for the bilayer of linker‐cyclodextrin thin films. Atomic force microscopy (AFM) studies on similar cyclodextrin systems yield thin‐film thickness ∼ 5 nm which supports the SAW measurements.
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