precision photoemission assessment.

[chaosdrone]

yeah i have been reading relentlessly lately about practical evaluation of such theories like EMT, percolation, maxwell, pal model, etc... and all what i have found was an unbelievable lack in generality for such laws being very case-dependant with paradoxical behaviours for many composite cases 

beside the crystals should induce photoemission already in the polymer phase which puts in quite of a predicable situation having to develop my unique theoretical interpretation to whatever (supposedly very accurate) data i get. 

[chaosdrone]

Well ,,apart from any quantum or coupling efficiency .... what if we assumed to have an ejected photo-electron inside a polymer ... what circuit should be most efficacious in sensing such freed electrons and what would be the minimal sensitivity of the detection (the least number of ejected electrons that could be detected)??

[chaosdrone]

i was just reading this .. http://pdfserv.maxim-ic.com/en/an/AN2236.pdf


sounding like if i succeeded in turning my very minuscule current into voltage then i'd be able to simulate that PIN diode in the circuit .. and hence gain such precision .. right?


but how ??

[Alex Tsekenis]

You do not have current in your circuit as current flow would be a number of charged particles (electrons here) passing through a section of your material and having a common net direction.

As I understand it, your electrons are bound in the material but not to a specific atom, much like a conductor.

My best bet with my very limited knowledge in this field would be to measure the conductivity or a similar quantity of your material. The more 'free' electrons, the higher the conductivity.

The circuit you linked is kind of the electronic equivalent of your polymer. Unless you tell me that this is the only solution I cant see how you can use this circuit with its current component values.

How about sending me some of your photoelectric goo  and I run some tests at uni or home? Maybe putting it on a glass substrate with two electrodes on each end.

[chaosdrone]

  well i first got to theorize the whole thing from synthesis to advanced testing before i get granted access to the lab inwhich i'll be able to make that goo 

[chaosdrone]

who would hate a test for free anyway 

[Alex Tsekenis]

I hate this about academic environments. Anyway, you could claim that a preliminary goo must be produced to verify the feasibility of a method to measure the conductivity of the goo.

[chaosdrone]

  yeah but even the low accuracy synthesis of a preliminary goo would require a specialized polymers lab, you know .. goo can't be prepared anywhere but in goo-labs 

[Alex Tsekenis]

Your toilet fits the description

On a different note, I don't think anyone here can readily help you with the theory behind your goo without pre-reading/research. If you can synth some goo, we can help you develop a conductivity meter.

[chaosdrone]

  lol

well, someone advised me with measuring the shot-noise phenomenon, by the use of a current integrator.

and this idea is so appealing to me, sounds like it takes down the measurement process to the edge.
have found much circuit schematics for this though, yet i wonder which particular design should i adopt, for a simple precision current integrator? 

[Alex Tsekenis]

You will have free electrons but you will not have current. You will need to accelerate them in an electrostatic field. The current integrator will integrate the tiny
current over time, thus measuring charge. If you know the time, you can work out the number of electrons freed.

The current integrator will probably take the form of an op-amp with a capacitor in the negative feedback path and a grounded non-inverting input. Your output will be -(1/C) x integral of (Iin) dt [Volts].

But you need to get those electrons moving.

[chaosdrone]

yeah five volts from a switching PS would do, across a highly resistive assembly  , i need to choose some accurate op-amp model though 

[Alex Tsekenis]

Here is a hard question:

What magnitude of current is expected under 5 Volts across your goo?

[chaosdrone]

I answer this 

well the pristine PANI should exhibit a conductivity in the magnitude around 10^8 .. well but that's not all .. i'll further need to optimize the suspended phase volume fraction and the physical dimensions of the composite block in order to optimize the current magnitude.. .. I am intending to start calculating that briefly.