Polymer sensors

Figure 26. An electric (ionic) pulse arrives from the brain through a nerve to the muscle, where it triggers conformational changes in proteins and chemical reactions. All the processes are three-dimensional. The generator (brain) is at the same time an ionic conductor. (Reprinted from T. F. Otero in Polymer Sensors and Actuators, Y. Osada and D. De Rossi, eds., Fig. 1, p., 19. Copyright 19XX. Reprinted with permission of Springer-Verlag.)...

T.F. Otero,in Polymer Sensors and Actuators, Y. Osada and D. De Rossi, eds., Springer-Verlag, (in press). 

A.L. Jenkins, R. Yin, and J.L. Jensen, Molecularly imprinted polymer sensors for pesticide and insecticide detection in water. Analyst 126, 798-802 (2001). 

A chemical sensor array (consisting of eight conducting polymer sensors) derived from an electronic nose [62], for the characterization of headspace gas from a sparged liquid sample... 

Nguyen TH, Ansell RJ (2009) Fluorescent imprinted polymer sensors for chiral amines. Org Biomol Chem 7 1211-1220... 

Keywords Bead Dye Imaging Luminescence Polymer Sensor... 

Bajaj A, Miranda OR, Kim I-B, Phillips RL, Jerry DJ, Bunz UHF, Rotello VM (2009) Detection and differentiation of normal, cancerous, and metastatic cells using nanoparticle-polymer sensor arrays. Proc Natl Acad Sci 106 10912-10916... 

Keywords Catalysis, Capillary electrochromatography, MIP, Polymer, Sensor, Solid phase extraction... 

Thin-film conjugated polymer sensors and aggregation 208... 

Designing a conjugated polymer sensor based on FQ, however, is not only a matter of making a fluorescent polymer for which the photoinduced electron transfer reaction is energetically favorable. There are other important factors that must be considered and requirements that must be met to rehably detect any analyte of interest, including TNT, from the vapor phase. In the broadest sense, these considerations distill to the two primary considerations for any sensing system, sensitivity and selectivity. 

Therefore, there are many considerations that must be taken into account in the design and synthesis of conjugated polymer sensors for explosive detection. Not only must the electron transfer process be efficient, but solid-state aggregation must also be avoided to retain maximum sensitivity. Strong binding of analyte to the polymer is necessary, which the 7l-acidic nature of TNT and DNT facilitate via... 

The 67-fold amplification obtained for polymer 3 is restricted by an inherent limitation of the wired in series design. As the exciton travels in a one-dimensional random walk process down the polymer chain, it has equal opportunity to visit a preceding or an ensuing receptor. This represents 134 random stepwise movements for 134 phenylene ethynylene units, and so much of the receptor sampling by the exciton is redundant. Increasing the efficiency of receptor sampling requires maximization of the number of different receptors that an exciton can visit throughout its lifetime. To achieve this end we extended the polymer sensor into two dimensions by use of a thin film and thereby increased the sensitivity. 

Silbert L, Ben Shlush I, Israel E, Porgador A, Kolusheva S, Jelinek R. Rapid chromatic detection of bacteria by use of a new biomimetic polymer sensor. Appl Environ Microbiol 2006 72 7339-7344. 

Greene NT, Morgan SL, Shimizu KD. Molecularly imprinted polymer sensor arrays. Chem Commiin 2004 1172-1173. 

Carvalho, E. R., Consolin Filho, N., Venancio, E. C., Osvaldo, N. O., Jr., Mattoso, L. H. C., and Martin-Neto, L. (2007). Detection of brominated by-products using a sensor array based on nanostructured thin films of conducting polymers. Sensors 7, 3258-3271. 

PNA strand, resulting in an increase of the electrochemical signal (SWV peak current) as a result of probe-target hybridization. The PNA-functionalized conductive polymer sensor allowed for a detection limit of approximately 10 nM, and the feasibility for single-nucleotide mismatch detection was also demonstrated. 

Electrical, resistive Mattoso (Brasil) Conducting polymer sensors [18]... 

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