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On revoit explicitement la construction ainsi que certaines propri\'et\'esdes complexes de faisceaux \'etales $\mathbb{Q}/\mathbb{Z}(j)$ sur certainssch\'emas. Le but de ces notes est d'avoir une r\'ef\'erence pr\'ecise pour laconjecture de Gersten pour les faisceaux $\mathbb{Q}/\mathbb{Z}(j)$ sur uncorps imparfait ainsi que pour la comparaison entre les groupes de cohomologie$\mathrm{H}^2(\ast,\mathbb{Q}/\mathbb{Z}(1))$ et$\mathrm{H}^2(\ast,\mathbb{G}_m)$. We review explicitly the definition and someproperties of \'etale sheaf complexes $\mathbb{Q}/\mathbb{Z}(j)$ on someschemes. The purpose of these notes is to be a precise reference for theGersten conjecture of $\mathbb{Q}/\mathbb{Z}(j)$ over an imperfect field andalso for the comparison between the cohomology groups$\mathrm{H}^2(\ast,\mathbb{Q}/\mathbb{Z}(1))$ and$\mathrm{H}^2(\ast,\mathbb{G}_m)$.

Faisceaux Q/Z(j) et conjecture de Gersten sur un corps imparfait